yinmeng-ios/xplan-ios/Main/Room/View/AnchorCycleView/AnchorRoomScrollView.m

//
//  AnchorRoomScrollView.m
//  xplan-ios
//
//  Created by GreenLand on 2022/7/11.
//

#import "AnchorRoomScrollView.h"
#import "XPMacro.h"
#import "RoomInfoModel.h"
//SVGA动画播放

#import "SVGAParserManager.h"
#import <ReactiveObjC/ReactiveObjC.h>

@interface AnchorRoomScrollView()<UIScrollViewDelegate, UIGestureRecognizerDelegate>

///动态背景
@property (nonatomic, strong) SVGAImageView *middleDisplayView;
@property (nonatomic, strong) SVGAParserManager *parserManager;

@property (nonatomic, strong) SVGAImageView *topDisplayView;

@property (nonatomic, strong) SVGAImageView *downDisplayView;

@property (nonatomic, assign) BOOL animatePlay;
@end

@implementation AnchorRoomScrollView


- (instancetype)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if(self)
	{
		self.backgroundColor = [UIColor clearColor];
        self.pagingEnabled = YES;
        self.showsHorizontalScrollIndicator = NO;
        self.showsVerticalScrollIndicator = NO;
        self.delegate = self;
        self.alwaysBounceVertical = NO;
        self.bounces = NO;
        self.delaysContentTouches = NO;
		self.scrollsToTop = NO;
        [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(roomMessageTabelViewStopScroll) name:@"roomMessageTabelViewStopScroll" object:nil];
		self.isCanScrollTop = NO;
        [self addSubview:self.topDisplayView];
        [self addSubview:self.middleDisplayView];
		[self addSubview:self.downDisplayView];

    }
    return self;
}

- (void)startAnimate:(SVGAImageView *)displayView {
    self.animatePlay = YES;
    NSString *bgString = [[NSBundle mainBundle] pathForResource:@"anchor_room_bg" ofType:@"svga"];
    NSURL *bgUrl = [NSURL fileURLWithPath:bgString];
    [self.parserManager loadSvgaWithURL:bgUrl completionBlock:^(SVGAVideoEntity * _Nullable videoItem) {
        if (videoItem != nil) {
            CGFloat width = videoItem.videoSize.width;
            CGFloat height = videoItem.videoSize.height;
            if (width > height) {
				displayView.contentMode = UIViewContentModeScaleAspectFit;
            } else {//高大于宽
                CGFloat resizeH = KScreenWidth * height / width;//按照屏幕的宽度去缩放，获得高度
                if (resizeH > KScreenHeight) {//如果大于屏幕高度，填充
					displayView.contentMode = UIViewContentModeScaleAspectFill;
                } else {//小于屏幕高度，
					displayView.contentMode = UIViewContentModeScaleAspectFit;
                }
            }
			displayView.loops = INT_MAX;
			displayView.clearsAfterStop = NO;
			displayView.videoItem = videoItem;
            [displayView startAnimation];
        }
    } failureBlock:^(NSError * _Nullable error) {
    }];
}

- (void)stopAnimate {
    [self.middleDisplayView stopAnimation];
	[self.topDisplayView stopAnimation];
	[self.downDisplayView stopAnimation];
    self.animatePlay = NO;
}

- (void)roomMessageTabelViewStopScroll {
    self.scrollEnabled = YES;
}

- (void)switchPlayer:(UIScrollView*)scrollView {
	CGFloat offset = scrollView.contentOffset.y;
	if (offset >= self.frame.size.height * 2)
	{
		if (self.anchorScrollDelegate && [self.anchorScrollDelegate respondsToSelector:@selector(anchorScrollViewScrollToNext:)]) {
			[self.anchorScrollDelegate anchorScrollViewScrollToNext:self];
		}
		[self stopAnimate];
	} else if (offset <= 0) {
		if (self.anchorScrollDelegate && [self.anchorScrollDelegate respondsToSelector:@selector(anchorScrollViewScrollToPrevious:)]) {
			[self.anchorScrollDelegate anchorScrollViewScrollToPrevious:self];
		}
		[self stopAnimate];
	}
}

-(void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if (scrollView.contentOffset.y > KScreenHeight) {///乡上滚动
        if (!self.animatePlay) {
            [self startAnimate:self.downDisplayView];
        }
	} else {///向下滚动
		if (self.isCanScrollTop) {
			if (!self.animatePlay) {
				[self startAnimate:self.topDisplayView];
			}
		} else {
			///刚进来的时候 还不能向上滚动的时候
			if (!self.animatePlay) {
				[self startAnimate:self.downDisplayView];
			}
		}
	}
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
	if (self.isCanScrollTop) {
		if (scrollView.contentOffset.y >= KScreenHeight * 2) {
			if (self.anchorScrollDelegate && [self.anchorScrollDelegate respondsToSelector:@selector(anchorScrollViewScrollToNext:)]) {
				[self.anchorScrollDelegate anchorScrollViewScrollToNext:self];
			}
		} else if(scrollView.contentOffset.y <= 0) {
			if (self.anchorScrollDelegate && [self.anchorScrollDelegate respondsToSelector:@selector(anchorScrollViewScrollToPrevious:)]) {
				[self.anchorScrollDelegate anchorScrollViewScrollToPrevious:self];
			}
		}
	} else {
		if (scrollView.contentOffset.y >= KScreenHeight) {
			if (self.anchorScrollDelegate && [self.anchorScrollDelegate respondsToSelector:@selector(anchorScrollViewScrollToNext:)]) {
				[self.anchorScrollDelegate anchorScrollViewScrollToNext:self];
			}
		}
	}
	[self stopAnimate];
}


- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer {
        ///666是外部的公屏消息列表 8888房间半屏弹框顶部消失的view
    if (otherGestureRecognizer.view.tag == 666 || otherGestureRecognizer.view.tag == 8888) {
        self.scrollEnabled = NO;
        return NO;
    }
    self.scrollEnabled = YES;
    return YES;
}

- (void)setIsCanScrollTop:(BOOL)isCanScrollTop {
	_isCanScrollTop = isCanScrollTop;
	CGRect frame = self.frame;
	if (_isCanScrollTop) {
		self.contentSize = CGSizeMake(0, frame.size.height * 3);
		self.topDisplayView.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);
		self.middleDisplayView.frame = CGRectMake(0, frame.size.height, frame.size.width, frame.size.height);
		self.downDisplayView.frame = CGRectMake(0, frame.size.height * 2, frame.size.width, frame.size.height);
		self.middleImageView = self.middleDisplayView;
	} else {
		self.contentSize = CGSizeMake(0, frame.size.height * 2);
		self.topDisplayView.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);
		self.middleDisplayView.frame = CGRectMake(0, 0, frame.size.width, frame.size.height);
		self.downDisplayView.frame = CGRectMake(0, frame.size.height, frame.size.width, frame.size.height);
		self.middleImageView = self.middleDisplayView;
	}
}

- (SVGAImageView *)middleDisplayView {
    if (_middleDisplayView == nil) {
		_middleDisplayView = [[SVGAImageView alloc] init];
		_middleDisplayView.contentMode = UIViewContentModeScaleToFill;
		_middleDisplayView.userInteractionEnabled = NO;
		_middleDisplayView.backgroundColor = [UIColor clearColor];
    }
    return _middleDisplayView;
}

- (SVGAImageView *)topDisplayView {
	if (_topDisplayView == nil) {
		_topDisplayView = [[SVGAImageView alloc] init];
		_topDisplayView.contentMode = UIViewContentModeScaleToFill;
		_topDisplayView.userInteractionEnabled = NO;
		_topDisplayView.backgroundColor = [UIColor clearColor];
	}
	return _topDisplayView;
}


- (SVGAImageView *)downDisplayView {
	if (_downDisplayView == nil) {
		_downDisplayView = [[SVGAImageView alloc] init];
		_downDisplayView.contentMode = UIViewContentModeScaleToFill;
		_downDisplayView.userInteractionEnabled = NO;
		_downDisplayView.backgroundColor = [UIColor clearColor];
	}
	return _downDisplayView;
}

- (SVGAParserManager *)parserManager {
    if (!_parserManager) {
        _parserManager = [[SVGAParserManager alloc] init];
    }
    return _parserManager;
}

@end