UIView 动画过程响应手势

利用UIKit的UIView做动画的时候，当控件在运动的时候是不允许交互的。

解决方案：options 添加 UIViewAnimationOptionAllowUserInteraction

[UIView animateWithDuration:self.startDuration delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
        self.frame = CGRectMake(self.pauseXRatio * screenSize.width, self.pauseYRatio * screenSize.height, self.giftWidth, self.giftHeight);
    } completion:^(BOOL finished) {
        dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(self.pauseDuration * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
            [UIView animateWithDuration:self.endDuration delay:0 options:UIViewAnimationOptionAllowUserInteraction animations:^{
                self.frame = CGRectMake(self.endXRatio * screenSize.width, self.endYRatio * screenSize.height, self.giftWidth, self.giftHeight);
            } completion:^(BOOL finished) {
                NSLog(@"动画结束了");
            }];
        });
    }];

但问题是：结果是只有在动画在中间停止的附近时，点击才会响应手势

终极解决方案：重写自定义 View 的 hitTest 方法

// 在自定义方法中重写下面这个方法

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event
{
    CGPoint locationPoint = [self.layer convertPoint:point toLayer:self.layer.presentationLayer];
    CALayer *layer = self.layer.presentationLayer;
    if(CGRectContainsPoint(layer.bounds, locationPoint)){
        return self;
    }
    
    if (!self.layer.presentationLayer) {
        return [super hitTest:point withEvent:event];
    }
    return nil;
}

转摘自：https://www.jianshu.com/p/a20faefccdbb