UILongPressGestureRecognizer in subview didnot work [duplicate]

StackOverflow https://stackoverflow.com/questions/19738303

  •  03-07-2022
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Question 

- (void)viewDidLoad
{
    [super viewDidLoad];
    CGRect imageRect = (CGRect){105, 180, 110, 110};
    UIImage *image = [UIImage imageNamed: @"sasuke.png"];
    UIImageView *imageView = [[UIImageView alloc] initWithFrame:imageRect];
    [imageView setImage: image];
    UILongPressGestureRecognizer *longGnizer=[[UILongPressGestureRecognizer alloc]initWithTarget:self action:@selector(longGo:)];
    imageView.userInteractionEnabled = YES;
    [imageView addGestureRecognizer:longGnizer];
    [self.view addSubview:imageView];
}

- (void)longGo:(UILongPressGestureRecognizer *)aGer{
    if(aGer.state==UIGestureRecognizerStateBegan) {
       NSLog(@"%s",__func__);
    }
}

here's the code ,but the func longGo were never work,why?when I use[self.view addGestureRecognizer:longGnizer],it did works.

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Solution

UIImageViews have userInteractionEnabled set to NO by default. You have to set imageView.userInteractionEnabled = YES;.

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