Question

在我的项目中，我想在点击超过3秒时显示隐藏的图像视图。我知道我需要使用NSTimer，但我从未创建过UIImageView触摸事件。如何将TapGestureRecognizer与NSTimer结合使用以实现我想要做的事情？我对触摸iOS中的事件完全不熟悉，我刚刚开始探索这个问题。所以，任何帮助将不胜感激。谢谢！

更新：我实现了如下的UILongPressGestureRecognizer，但是现在，即使我按下图像外的某个地方，也会出现隐藏的图像。如何仅在按下隐藏图像时才能显示？

 - (void)viewDidLoad
    {
            [super viewDidLoad];

        UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(handleLongPress:)];
        longPress.numberOfTouchesRequired = 1;
longPress.minimumPressDuration = 3;
        [self.view addGestureRecognizer:longPress];
    }


-(void)handleLongPress:(UILongPressGestureRecognizer *)gesture
{
    if (gesture.state == UIGestureRecognizerStateBegan)
    {
        BrokenGlass.hidden = NO;


    }
}

Answer 1

您不需要UITapGestureRecognizer和计时器，而是需要UILongPressGestureRecognizer。

Answer 2

图像正在显示，因为您在整个视图中使用手势识别器。

        [**self.view** addGestureRecognizer:longPress];

手势不会触发隐藏元素。

这是我的解决方案：

@interface ViewController () <UIGestureRecognizerDelegate>

@property (nonatomic, strong) UIImageView *imageView;
@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];

    // create the imageView
    _imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 0, 200, 200)];

    // enable the user interaction in the imageView (otherwise it will not receive events)
    _imageView.userInteractionEnabled = YES;

    // add as a subview of the main view
    [self.view addSubview:_imageView];

    // create the gesture recognizer
    UILongPressGestureRecognizer *longPressGesture = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressHandler:)];
    longPressGesture.delegate = self;
    longPressGesture.minimumPressDuration = 3;

    // add the gesture to the imageView
    [_imageView addGestureRecognizer:longPressGesture];

}

#pragma mark - UIGestureRecognizerDelegate
- (void)longPressHandler:(UILongPressGestureRecognizer *)gestureRecognizer {

    // show the image
    _imageView.image = [UIImage imageNamed:@"cat.jpeg"];

}

长按即可显示隐藏的UIImage

2 个答案: