Cocoa touch 刷卡XCode的实时反馈

我已成功使用

UISWeepGestureRecognitizer

更改视图，但它仅在我完成刷卡后才开始更改视图。当我开始在屏幕上拖动手指时，如何使其启动？我已经搜索过了，但找不到答案。

手势识别器将等待确定做出了哪个手势。这就是为什么他们总是有一些延迟。另一种方法是实现您自己的刷卡处理程序。例如，您可以使用touchsbegind:touchsended:touchsmoved:和touchscancelled:-方法

（请记住通过为节点启用userInteractionEnabled属性来启用这些方法）

用平底锅的姿势

     UIPanGestureRecognizer *pan = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handlePan:)];
     [self addGestureRecognizer:pan];

然后做：

- (void)handlePan:(UIPanGestureRecognizer *)gesture {

    CGPoint touchPoint = [gesture locationInView:YOUR_VIEW];
    UIView *draggedView = [gesture view];

    switch ([gesture state]) {

        case UIGestureRecognizerStateBegan:    
            break;

        case UIGestureRecognizerStatePossible:

            break;

        case UIGestureRecognizerStateChanged:
            break;

        case UIGestureRecognizerStateEnded:
            break;

        case UIGestureRecognizerStateCancelled:
            break;

        case UIGestureRecognizerStateFailed:
            break;

        default: 
            break;
    }
}

---

当你移动手指时，平移手势识别器会不断给你回叫。我从来没说过不会。我只是注意到（某些）手势识别器（如滑动）在触发之前总是有一点延迟。这就是为什么它们可能不适合需要即时反馈的情况。事实上，您可以使用PangestureRecognitor来实现自己的刷卡手势。我只是建议了另一种注册触摸的方法。

- (void)handlePan:(UIPanGestureRecognizer *)gesture {

    CGPoint touchPoint = [gesture locationInView:YOUR_VIEW];
    UIView *draggedView = [gesture view];

    switch ([gesture state]) {

        case UIGestureRecognizerStateBegan:    
            break;

        case UIGestureRecognizerStatePossible:

            break;

        case UIGestureRecognizerStateChanged:
            break;

        case UIGestureRecognizerStateEnded:
            break;

        case UIGestureRecognizerStateCancelled:
            break;

        case UIGestureRecognizerStateFailed:
            break;

        default: 
            break;
    }
}