判断是否touch了某个View(winningView):
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = [touches anyObject];
CGPoint pt = [touch locationInView:self.view];
//点击其他地方消失
if (!CGRectContainsPoint([self.winningView frame], pt)) {
//to-do
}
}