让UIView、UIWindow等透明遮挡不影响下面视图操作方法

重写view的hitTest方法

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event  {

UIView *hitView = [super hitTest:point withEvent:event];

if (hitView == self) {

return nil;

} else {

return hitView;

}

}