UILongPressGestureRecognizer答案

【问题标题】：UILongPressGestureRecognizerUILongPressGestureRecognizer
【发布时间】：2011-05-18 05:45:29
【问题描述】：

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

我有：

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

还有

- (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;
    }   
}

这很适合一个按钮（即 ivar button）。如何将正在按下的当前按钮发送到 handleLongPress 函数？换句话说，我想做类似下面的事情，我传入sender

- (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;
    }   
}

【问题讨论】：

标签： iphone objective-c ios

【解决方案1】：

你试过recognizer.view吗？

【讨论】：

【解决方案2】：

您必须将所有按钮循环到 handleLongPress。使用 locationInView 和 pointInside:withEvent: 来确定哪个按钮在按下的手指下。

【讨论】：