UIView: touches:刷卡？

Question

有没有更简单的方法来检测滑动动作及其方向，而不需要执行touchesBegin和touchesEnd？

谢谢

Answer 1

使用UISwipeGestureRecognizer怎么样？您可以创建UISwipeGestureRecognizer，然后将其添加到视图中，请查看文档UISwipeGestureRecognizer。

设置它可能如下所示：

UISwipeGestureRecognizer *swipeRecognizer = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swiped:)];
[myView addGestureRecognizer:swipeRecognizer];
[swipeRecognizer release]; swipeRecognizer = nil;

然后实现您的方法，该方法将在滑动时被调用(这是@selector(swiped:))

- (void)swiped:(UISwipeGestureRecognizer *)swipeGestureRecognizer
{
    if (swipeGestureRecognizer.direction == UISwipeGestureRecognizerDirectionRight) {
        NSLog(@"Direction = right");
    } else if (swipeGestureRecognizer.direction == UISwipeGestureRecognizerDirectionLeft) {
        NSLog(@"Direction = left");
    }
}

Answer 2

这只是一个方向。你应该像这样使用2个方向。

    UISwipeGestureRecognizer *swipeRecognizerLeft = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swiped:)];
swipeRecognizerLeft.direction = UISwipeGestureRecognizerDirectionLeft;
[_cameraView addGestureRecognizer:swipeRecognizerLeft];

UISwipeGestureRecognizer *swipeRecognizerRight = [[UISwipeGestureRecognizer alloc] initWithTarget:self action:@selector(swiped:)];
swipeRecognizerRight.direction = UISwipeGestureRecognizerDirectionRight;
[_cameraView addGestureRecognizer:swipeRecognizerRight];