控制局部对触摸的响应与否

BView遮挡AView，BView有子viewB1，AView有手势。希望点击在B1中的时候，AView可以响应手势。

若果让BView整个userInteractionEnabled = NO，那么点击在BView的任何地方，AView的手势都会响应，不符合要求。

可以用一下函数实现

- (BOOL)pointInside:(CGPoint)point withEvent:(nullable UIEvent *)event;   // default returns YES if point is in bounds

 

@interface BView ()
@property (strong, nonatomic) UIView *B1;

@end

@implementation BView

...

//重写pointInside:withEvent函数
- (BOOL)pointInside:(CGPoint)point withEvent:(UIEvent *)event {
    if ([self.B1 pointInside:[self convertPoint:point toView:self.B1] withEvent:event]) { //如果点击在B1内，就不再传递，让出响应
        return NO;
    } return YES;
}
@end