iOS 滑动上面的scrollView，将滑动事件传递给下面的scrollView

image.png

1.将scrollView 添加父类

@interface Scr1 : UIScrollView

@property (nonatomic, copy) void(^isPointInsideHandle)(UIScrollView * scr);

@end

@implementation Scr1

- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        UIButton *bt = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, 50, 50)];
        [bt addTarget:self action:@selector(aaa) forControlEvents:UIControlEventTouchUpInside];
        bt.backgroundColor = [UIColor yellowColor];
        [self addSubview:bt];
    }
    return self;
}

- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event
{
    BOOL isHit = [super pointInside:point withEvent:event];
    if (isHit && self.isPointInsideHandle) {
        self.isPointInsideHandle(self);
    }
    return isHit;
}

VC的代码 这里就将scro1的手势给了scro2。现象滑动scro1时候，scro2才会移动

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    
    self.view.backgroundColor = [UIColor whiteColor];
    
    Scr1 *scr1 = [[Scr1 alloc] initWithFrame:CGRectMake(0, 100, 200, 200)];
    [self.view addSubview:scr1];
    scr1.contentSize = CGSizeMake(500, 500);
    scr1.backgroundColor = [UIColor redColor];
    [scr1 setIsPointInsideHandle:^(UIScrollView * _Nonnull scr) {
        UIPanGestureRecognizer * listPan = self.scr2.panGestureRecognizer;
        
//        NSLog(@"self.scr2 == %@", self.scr2.gestureRecognizers);
//        NSLog(@"scr == %@", scr.gestureRecognizers);

        if ([scr.gestureRecognizers containsObject:listPan] == NO) {
            [scr addGestureRecognizer:listPan];
        }
    }];
    
    Scr2 *scr2 = [[Scr2 alloc] initWithFrame:CGRectMake(0, 400, 200, 200)];
    [self.view addSubview:scr2];
    scr2.contentSize = CGSizeMake(500, 500);
    scr2.backgroundColor = [UIColor yellowColor];
    self.scr2 = scr2;
    
    [self.scr2 setIsPointInsideHandle:^(UIScrollView * _Nonnull scr) {
       
    }];
}

当点击其他地方，或者scro1的点击事件非滑动事件，将事件返回。
在哪里才能真正判断事件是滑动还是点击呢。答案是： Window

@implementation MYTouchObserverWindow

//触摸时，所有的事件分发都在这里
- (void)sendEvent:(UIEvent *)event {
    [super sendEvent:event];
    for (UITouch * touch in event.allTouches) {
        if (UITouchPhaseEnded == touch.phase || UITouchPhaseCancelled == touch.phase) {
            //触摸离开屏幕
            //allTouches通常只有一个
            [[AAAA sharedInstance] bbbb];
            return;
        }
    }
}

image.png

self.collectionArray 添加上面 self.scro1

下面代码就会将 scro1的滑动手势还给scro1.并且从scro2移除。

- (void)bbbb {
    for (UICollectionView * colletionView in self.collectionArray) {
        if ([colletionView.gestureRecognizers containsObject:colletionView.panGestureRecognizer] == NO) {
            //手势添加给一个view，会自动从原来的view移除
            [colletionView addGestureRecognizer:colletionView.panGestureRecognizer];
        }
    }
}