iphone - UILongPressGestureRecognizer

Question

我正在尝试创建一个应用程序，当触发 UILongPressGestureRecognizer 手势时，可以拖放 UIButtons。

我有:

UIGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]
initWithTarget:self action:@selector(handleLongPress:)];

和

- (void)handleLongPress:(UILongPressGestureRecognizer *)recognizer {
    CGPoint location = [recognizer locationInView:self.view];

    switch (recognizer.state) {
        case UIGestureRecognizerStateBegan:
            //NSLog(@"handleLongPress: StateBegan");
            break;
        case UIGestureRecognizerStateChanged:
            if(location.y > 75.0 && location.x > 25 && location.x < 300)
                button.frame = CGRectMake(location.x-25, location.y-15, 50, 30);           
            break;
        case UIGestureRecognizerStateEnded:
            //NSLog(@"handleLongPress: StateEnded");
            break;
        default:
            break;
    }   
}

使用一个按钮(即 ivar button)效果很好。如何将当前按下的按钮发送到 handleLongPress 函数？换句话说，我想在传入 sender

的地方做类似下面的事情

- (void)handleLongPress:(UILongPressGestureRecognizer *)recognizer:(id)sender {
    CGPoint location = [recognizer locationInView:self.view];

    switch (recognizer.state) {
        case UIGestureRecognizerStateBegan:
            //NSLog(@"handleLongPress: StateBegan");
            break;
        case UIGestureRecognizerStateChanged:
            if(location.y > 75.0 && location.x > 25 && location.x < 300)
                sender.frame = CGRectMake(location.x-25, location.y-15, 50, 30);           
            break;
        case UIGestureRecognizerStateEnded:
            //NSLog(@"handleLongPress: StateEnded");
            break;
        default:
            break;
    }   
}

Answer 1

你试过 recognizer.view 了吗？