ios – 如何实现点击并保持UIImageView？

当我触摸并按住图像2秒钟时,我正试图拨打警报框.这是我到目前为止所得到的：

- (void)viewDidLoad
{
    [super viewDidLoad];

    UILongPressGestureRecognizer *tapAndHoldGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleTapAndHoldGesture:)];
    tapAndHoldGesture.minimumPressDuration = 0.1;
    tapAndHoldGesture.allowableMovement = 600;
    [self.view addGestureRecognizer:tapAndHoldGesture]; 
}

- (void) handleTapAndHoldGesture:(UILongPressGestureRecognizer *)gestureRecognizer{
    if (gestureRecognizer.state != UIGestureRecognizerStateEnded) {
        return;
    }
    UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Gesture:" message:@"hold it" delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
    [alert show];
}

不确定这是否会产生任何影响,但是Image View是以后以编程方式创建的,而不是在加载时.提前感谢您的任何帮助表示赞赏..

另外,我看了以下链接：

Long press gesture on UICollectionViewCell

Long press gesture recognizer on UIButton?

Apple Link 1

Apple Link 2

解决方法

-(void)viewDidLoad
{
    [super viewDidLoad];
    [self setupGesture];
}

-(void) setupGesture
{
    UILongPressGestureRecognizer *lpHandler = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleHoldGesture:)];
    lpHandler.minimumPressDuration = 1; //seconds
    lpHandler.delegate = self;
    //myUIImageViewInstance - replace for your instance/variable name
    [**myUIImageViewInstance** addGestureRecognizer:lpHandler];
}

- (void) handleHoldGesture:(UILongPressGestureRecognizer *)gesture
{
   if(UIGestureRecognizerStateBegan == gesture.state)
   {
        // Called on start of gesture,do work here
   }

   if(UIGestureRecognizerStateChanged == gesture.state)
   {
        // Do repeated work here (repeats continuously) while finger is down
   }

   if(UIGestureRecognizerStateEnded == gesture.state)
   {
        // Do end work here when finger is lifted
   }

}