iOS UIGestureRecognizer手势

1.UILongPressGestureRecognizer（长按手势）

1.关于长按手势调用方法执行2次的解决办法

//由于长按手势调用方法会在UIGestureRecognizerStateBegan，UIGestureRecognizerStateEnded各执行一次，所以区分开这2个状态就能避免调用2次
UILongPressGestureRecognizer *longs = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(saveWithPhone:)];
 [self addGestureRecognizer:longs];

- (void)saveWithPhone:(UILongPressGestureRecognizer *)longs
{
    
    if (longs.state == UIGestureRecognizerStateBegan)
    {
        //在这写需要执行的代码
    } else if (longs.state == UIGestureRecognizerStateEnded)
    {
        
    }
}

2.多个手势同时使用

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer
{
    return YES;
}

3. 这个能够避免cell点击和UITableView的点击事件的冲突
   注意：给cell添加手势，在手势的范围区域里，它会处理手势，而不是cell的点击事件，在范围外它会处理cell的点击事件

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch {
    
    // 若为UITableViewCellContentView（即点击了tableViewCell），则不截获Touch事件
    if ([NSStringFromClass([touch.view class]) isEqualToString:@"UITableViewCellContentView"]) {
        return NO;
    }else
    {
        return YES;
    }
}