在父視圖添加如下代碼。其思路如下：

• 歷父視圖的所有子視圖
• 判斷觸發(fā)事件的點(diǎn)是否在子視圖的bounds內(nèi)
• 如果在,返回這個(gè)子視圖

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    UIView *view = [super hitTest:point withEvent:event];
    if (view == nil) {
        for (UIView *subView in self.subviews) {
            CGPoint p = [subView convertPoint:point fromView:self];
            if (CGRectContainsPoint(subView.bounds, p)) {
                view = subView;
            }
        }
    }
    return view;
}