UILongPressGestureRecognizer

Question

我正在尝试创建一个应用程序，当UILongPressGestureRecognizer手势被触发时，UIButtons可以被拖放。

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;
    }   
}

这可以通过一个按钮（即ivar button ）很好地工作。 如何向handleLongPress函数发送正在按下的当前按钮？ 换句话说，我想在传递sender地方做以下的事情

- (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

你尝试过recognizer.view吗？

Answer 2

您必须将所有按钮循环到handleLongPress中。 使用locationInView和pointInside：withEvent：确定按下手指下面的按钮。