455 lines
16 KiB
Objective-C
455 lines
16 KiB
Objective-C
//
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// UIImage+Utils.m
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// YYMobileFramework
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//
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// Created by wuwei on 14/6/20.
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// Copyright (c) 2014年 YY Inc. All rights reserved.
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//
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#import "UIImage+Utils.h"
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#import <ImageIO/ImageIO.h>
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@implementation UIImage (Utils)
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- (UIImage *)grayscaleImage
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{
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CGFloat width = self.size.width;
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CGFloat height = self.size.height;
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CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceGray();
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CGContextRef context = CGBitmapContextCreate(nil,
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width,
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height,
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8,
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0,
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colorSpace,
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kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedLast);
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CGColorSpaceRelease(colorSpace);
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if (context == NULL) {
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return nil;
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}
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CGContextDrawImage(context, CGRectMake(0, 0, width, height), self.CGImage);
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CGImageRef imageRef = CGBitmapContextCreateImage(context);
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UIImage *grayscaleImage = [UIImage imageWithCGImage:imageRef];
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CGImageRelease(imageRef);
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CGContextRelease(context);
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return grayscaleImage;
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}
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- (UIImage *)imageBlendInGray {
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UIGraphicsBeginImageContext(self.size);
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CGRect bounds = CGRectMake(0, 0, self.size.width, self.size.height);
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CGContextRef context = UIGraphicsGetCurrentContext();
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CGContextFillRect(context, bounds);
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[self drawInRect:bounds blendMode:kCGBlendModeLuminosity alpha:1.0f];
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[self drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:1.0f];
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UIImage *newImg = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return newImg;
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}
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- (UIImage *)imageWithBlendMode:(CGBlendMode)blendMode {
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UIGraphicsBeginImageContextWithOptions(self.size, NO, 0.0f);
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CGRect bounds = CGRectMake(0, 0, self.size.width, self.size.height);
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UIRectFill(bounds);
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[self drawInRect:bounds blendMode:blendMode alpha:1.0f];
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if (blendMode != kCGBlendModeDestinationIn) {
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[self drawInRect:bounds blendMode:kCGBlendModeDestinationIn alpha:1.0f];
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}
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UIImage *newImg = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return newImg;
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}
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+ (UIImage *)imageWithColor:(UIColor *)color
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{
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return [self imageWithColor:color size:CGSizeMake(1, 1)];
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}
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+ (UIImage *)imageWithColor:(UIColor *)color size:(CGSize)size {
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if (!color || size.width <= 0 || size.height <= 0) return nil;
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CGRect rect = CGRectMake(0.0f, 0.0f, size.width + 1, size.height);
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UIGraphicsBeginImageContextWithOptions(rect.size, NO, 0);
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CGContextRef context = UIGraphicsGetCurrentContext();
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CGContextSetFillColorWithColor(context, color.CGColor);
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CGContextFillRect(context, rect);
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UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return image;
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}
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+ (UIImage *)fixOrientation:(UIImage *)aImage {
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// No-op if the orientation is already correct
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if (aImage.imageOrientation == UIImageOrientationUp)
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return aImage;
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// We need to calculate the proper transformation to make the image upright.
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// We do it in 2 steps: Rotate if Left/Right/Down, and then flip if Mirrored.
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CGAffineTransform transform = CGAffineTransformIdentity;
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switch (aImage.imageOrientation) {
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case UIImageOrientationDown:
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case UIImageOrientationDownMirrored:
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transform = CGAffineTransformTranslate(transform, aImage.size.width, aImage.size.height);
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transform = CGAffineTransformRotate(transform, M_PI);
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break;
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case UIImageOrientationLeft:
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case UIImageOrientationLeftMirrored:
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transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
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transform = CGAffineTransformRotate(transform, M_PI_2);
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break;
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case UIImageOrientationRight:
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case UIImageOrientationRightMirrored:
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transform = CGAffineTransformTranslate(transform, 0, aImage.size.height);
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transform = CGAffineTransformRotate(transform, -M_PI_2);
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break;
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default:
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break;
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}
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switch (aImage.imageOrientation) {
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case UIImageOrientationUpMirrored:
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case UIImageOrientationDownMirrored:
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transform = CGAffineTransformTranslate(transform, aImage.size.width, 0);
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transform = CGAffineTransformScale(transform, -1, 1);
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break;
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case UIImageOrientationLeftMirrored:
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case UIImageOrientationRightMirrored:
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transform = CGAffineTransformTranslate(transform, aImage.size.height, 0);
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transform = CGAffineTransformScale(transform, -1, 1);
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break;
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default:
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break;
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}
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// Now we draw the underlying CGImage into a new context, applying the transform
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// calculated above.
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CGContextRef ctx = CGBitmapContextCreate(NULL, aImage.size.width, aImage.size.height,
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CGImageGetBitsPerComponent(aImage.CGImage), 0,
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CGImageGetColorSpace(aImage.CGImage),
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CGImageGetBitmapInfo(aImage.CGImage));
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CGContextConcatCTM(ctx, transform);
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switch (aImage.imageOrientation) {
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case UIImageOrientationLeft:
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case UIImageOrientationLeftMirrored:
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case UIImageOrientationRight:
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case UIImageOrientationRightMirrored:
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// Grr...
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CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.height,aImage.size.width), aImage.CGImage);
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break;
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default:
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CGContextDrawImage(ctx, CGRectMake(0,0,aImage.size.width,aImage.size.height), aImage.CGImage);
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break;
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}
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// And now we just create a new UIImage from the drawing context
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CGImageRef cgimg = CGBitmapContextCreateImage(ctx);
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UIImage *img = [UIImage imageWithCGImage:cgimg];
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CGContextRelease(ctx);
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CGImageRelease(cgimg);
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return img;
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}
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- (UIImage *)imageWithColor:(UIColor *)color {
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CGRect rect = CGRectMake(0.0f, 0.0f, 1.0f, 1.0f);
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UIGraphicsBeginImageContext(rect.size);
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CGContextRef context = UIGraphicsGetCurrentContext();
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CGContextSetFillColorWithColor(context, [color CGColor]);
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CGContextFillRect(context, rect);
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UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return image;
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}
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//异步生成纯色圆角图片
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- (void)imageWithSize:(CGSize)size radius:(CGFloat)radius backColor:(UIColor *)backColor completion:(void(^)(UIImage *image))completion {
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// 异步绘制裁切
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dispatch_async(dispatch_get_global_queue(0, 0), ^{
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// 利用绘图建立上下文
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UIGraphicsBeginImageContextWithOptions(size, true, 0);
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CGRect rect = CGRectMake(0, 0, size.width, size.height);
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// 填充颜色
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[backColor setFill];
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UIRectFill(rect);
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// // 贝塞尔裁切
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// UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect cornerRadius:radius];
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// [path addClip];
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// [self drawInRect:rect];
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// 获取结果
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UIImage *resultImage = [UIGraphicsGetImageFromCurrentImageContext() circularImage];
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// 关闭上下文
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UIGraphicsEndImageContext();
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// 主队列回调
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dispatch_async(dispatch_get_main_queue(), ^{
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completion(resultImage);
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});
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});
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}
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- (UIImage *)circularImage {
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// 1. 开启图形上下文
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UIGraphicsBeginImageContextWithOptions(self.size, NO, 0);
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// 2. 描述路径
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UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, self.size.width, self.size.height) byRoundingCorners:UIRectCornerTopLeft|UIRectCornerTopRight | UIRectCornerBottomLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(self.size.width, self.size.height)];
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// UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, self.size.width, self.size.height)];
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// 3. 添加裁减区域
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[path addClip];
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// 4. 绘制图片
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[self drawAtPoint:CGPointZero];
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// 5. 从上下文获取图片
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UIImage * image = UIGraphicsGetImageFromCurrentImageContext();
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// 6. 关闭上下文
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UIGraphicsEndImageContext();
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// 7. 设置图片
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return image;
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}
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+ (UIImage *)gradientColorImageFromColors:(NSArray<UIColor *> *)colors gradientType:(GradientType)gradientType imgSize:(CGSize)imgSize{
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NSMutableArray *ar = [NSMutableArray array];
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for(UIColor *c in colors) {
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[ar addObject:(id)c.CGColor];
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}
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UIGraphicsBeginImageContextWithOptions(imgSize, YES, 1);
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CGContextRef context = UIGraphicsGetCurrentContext();
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CGContextSaveGState(context);
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CGColorSpaceRef colorSpace = CGColorGetColorSpace([[colors lastObject] CGColor]);
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CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (CFArrayRef)ar, NULL);
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CGPoint start;
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CGPoint end;
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switch (gradientType) {
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case GradientTypeTopToBottom:
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start = CGPointMake(0.0, 0.0);
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end = CGPointMake(0.0, imgSize.height);
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break;
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case GradientTypeLeftToRight:
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start = CGPointMake(0.0, 0.0);
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end = CGPointMake(imgSize.width, 0.0);
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break;
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case GradientTypeUpleftToLowright:
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start = CGPointMake(0.0, 0.0);
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end = CGPointMake(imgSize.width, imgSize.height);
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break;
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case GradientTypeUprightToLowleft:
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start = CGPointMake(imgSize.width, 0.0);
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end = CGPointMake(0.0, imgSize.height);
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break;
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default:
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break;
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}
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CGContextDrawLinearGradient(context, gradient, start, end, kCGGradientDrawsBeforeStartLocation | kCGGradientDrawsAfterEndLocation);
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UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
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CGGradientRelease(gradient);
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CGContextRestoreGState(context);
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CGColorSpaceRelease(colorSpace);
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UIGraphicsEndImageContext();
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return image;
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}
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- (UIImage *)setCornerWithRadius:(CGFloat)radius andSize:(CGSize)size {
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//开启图形上下文
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UIGraphicsBeginImageContext(size);
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//绘制圆角矩形
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CGRect rect = CGRectMake(0, 0, size.width, size.height);
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UIBezierPath *path = [UIBezierPath bezierPathWithRoundedRect:rect byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(radius, radius)];
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//将Path添加到上下文中
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CGContextAddPath(UIGraphicsGetCurrentContext(), path.CGPath);
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//裁剪上下文
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CGContextClip(UIGraphicsGetCurrentContext());
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//将图片绘制到上下文中
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[self drawInRect:rect];
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//设置绘制模式
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CGContextDrawPath(UIGraphicsGetCurrentContext(), kCGPathStroke);
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//获取图片
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UIImage *output = UIGraphicsGetImageFromCurrentImageContext();
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//关闭上下文
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UIGraphicsEndImageContext();
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//返回裁剪好的图片
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return output;
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}
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// 给图片添加图片水印
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+ (UIImage *)waterImageWithImage:(UIImage *)image waterImage:(UIImage *)waterImage waterImageRect:(CGRect)rect
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{
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//1.获取图片
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//2.开启上下文
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UIGraphicsBeginImageContextWithOptions(image.size, NO, 0);
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//3.绘制背景图片
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[image drawInRect:CGRectMake(0, 0, image.size.width, image.size.height)];
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//绘制水印图片到当前上下文
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[waterImage drawInRect:rect];
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//4.从上下文中获取新图片
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UIImage * newImage = UIGraphicsGetImageFromCurrentImageContext();
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//5.关闭图形上下文
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UIGraphicsEndImageContext();
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//返回图片
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return newImage;
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}
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+ (CGSize)sizeWithImageOriginSize:(CGSize)originSize
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minSize:(CGSize)imageMinSize
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maxSize:(CGSize)imageMaxSiz {
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CGSize size;
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NSInteger imageWidth = originSize.width ,imageHeight = originSize.height;
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NSInteger imageMinWidth = imageMinSize.width, imageMinHeight = imageMinSize.height;
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NSInteger imageMaxWidth = imageMaxSiz.width, imageMaxHeight = imageMaxSiz.height;
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if (imageWidth > imageHeight) //宽图
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{
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size.height = imageMinHeight; //高度取最小高度
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size.width = imageWidth * imageMinHeight / imageHeight;
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if (size.width > imageMaxWidth)
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{
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size.width = imageMaxWidth;
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}
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}
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else if(imageWidth < imageHeight)//高图
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{
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size.width = imageMinWidth;
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size.height = imageHeight *imageMinWidth / imageWidth;
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if (size.height > imageMaxHeight){
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size.height = imageMaxHeight;
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}
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}
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else//方图
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{
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if (imageWidth > imageMaxWidth){
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size.width = imageMaxWidth;
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size.height = imageMaxHeight;
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}else if(imageWidth > imageMinWidth){
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size.width = imageWidth;
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size.height = imageHeight;
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}else{
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size.width = imageMinWidth;
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size.height = imageMinHeight;
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}
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}
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return size;
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}
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- (UIImage *)cutImage:(CGSize)newSize{
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CGFloat scale = newSize.height / self.size.height;
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UIImage *scaleImage = [self originImage:self scaleToSize:CGSizeMake(self.size.width*scale, self.size.height*scale)];
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//裁剪暂时有问题
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return scaleImage;
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}
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- (UIImage*) originImage:(UIImage *)image scaleToSize:(CGSize)size {
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UIGraphicsBeginImageContextWithOptions(size, NO, [UIScreen mainScreen].scale);
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[image drawInRect:CGRectMake(0, 0, size.width, size.height)];
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UIImage* scaledImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return scaledImage;
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}
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-(UIImage *)compressWithMaxLength:(NSUInteger)maxLength{
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// Compress by quality
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CGFloat compression = 1;
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NSData *data = UIImageJPEGRepresentation(self, compression);
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if (data.length < maxLength) return self;
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CGFloat max = 1;
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CGFloat min = 0;
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for (int i = 0; i < 6; ++i) {
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compression = (max + min) / 2;
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data = UIImageJPEGRepresentation(self, compression);
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//NSLog(@"Compression = %.1f", compression);
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//NSLog(@"In compressing quality loop, image size = %ld KB", data.length / 1024);
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if (data.length < maxLength * 0.9) {
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min = compression;
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} else if (data.length > maxLength) {
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max = compression;
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} else {
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break;
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}
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}
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//NSLog(@"After compressing quality, image size = %ld KB", data.length / 1024);
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if (data.length < maxLength) return self;
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UIImage *resultImage = [UIImage imageWithData:data];
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// Compress by size
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NSUInteger lastDataLength = 0;
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while (data.length > maxLength && data.length != lastDataLength) {
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lastDataLength = data.length;
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CGFloat ratio = (CGFloat)maxLength / data.length;
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//NSLog(@"Ratio = %.1f", ratio);
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CGSize size = CGSizeMake((NSUInteger)(resultImage.size.width * sqrtf(ratio)),
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(NSUInteger)(resultImage.size.height * sqrtf(ratio))); // Use NSUInteger to prevent white blank
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UIGraphicsBeginImageContext(size);
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[resultImage drawInRect:CGRectMake(0, 0, size.width, size.height)];
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resultImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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data = UIImageJPEGRepresentation(resultImage, compression);
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//NSLog(@"In compressing size loop, image size = %ld KB", data.length / 1024);
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}
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if (data) {
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return [UIImage imageWithData:data];;
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} else {
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return self;
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}
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}
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- (UIImage *)roundedImageWithCornerRadius:(CGFloat)cornerRadius size:(CGSize)size{
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UIGraphicsBeginImageContextWithOptions(size, NO, 1);
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UIBezierPath *clippingPath = [UIBezierPath bezierPathWithRoundedRect:CGRectMake(0, 0, size.width, size.height) cornerRadius:cornerRadius];
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[clippingPath addClip];
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[self drawInRect:CGRectMake(0, 0, size.width, size.height)];
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UIImage *roundedImage = UIGraphicsGetImageFromCurrentImageContext();
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UIGraphicsEndImageContext();
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return roundedImage;
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}
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+(UIImage *)getImageFromView:(UIView *)view {
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// 1. 创建一个新的图像上下文，大小与view的bounds相匹配
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UIGraphicsBeginImageContextWithOptions(view.bounds.size, view.opaque, 0.0);
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// 2. 获取当前图像上下文
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CGContextRef context = UIGraphicsGetCurrentContext();
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// 3. 将view的层级渲染到上下文中
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[view.layer renderInContext:context];
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// 4. 从上下文中获取生成的图片
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UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
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// 5. 结束图像上下文
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UIGraphicsEndImageContext();
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// 6. 返回生成的图片
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return image;
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}
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@end
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