IOS UIGestureRecognizer 手勢的實用匯總

UITapGestureRecognizer 的使用，判斷點擊哪個控件

UITapGestureRecognizer 的使用，判斷點擊哪個控件

說明：_backgroundImg 和_userHeaderImg都在_headerView上，給_headerView添加手勢，判斷用戶點擊是在_userHeaderImg還是_backgroundImg上，一個是修改頭像，一個是修改背景圖

//添加手勢

        UITapGestureRecognizer *backgroundTap=[[UITapGestureRecognizer alloc]initWithTarget:self action:@selector(changeHeaderImageAction:)];

        [_headerView addGestureRecognizer:backgroundTap];

-(void)changeHeaderImageAction :(UITapGestureRecognizer *)tap {

    CGPoint touchPoint = [tap locationInView:_headerView];
    CGRect userHeaderImageRect = [_headerView convertRect:_userHeaderImg.bounds fromView:_userHeaderImg];
    if (CGRectContainsPoint(userHeaderImageRect, touchPoint)) {
        //clicked user header image.
        _isHeaderImg=@"1";
        [self setPhotoOrTakePictureAction];
        return;
    }   

    CGRect backgroundImageRect = [_backgroundImg convertRect:_backgroundImg.bounds toView:_headerView];

    if (CGRectContainsPoint(backgroundImageRect, touchPoint)) {
        //clicked back image.
        _isHeaderImg=@"0";
        [self setPhotoOrTakePictureAction];
    }
}