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