objective-c - 点击手势事件未在UIImageView上触发

Question

我正在尝试在UIImageView上实现敲打手势识别器。但是我无法处理触发tap事件的方法。我已经将我的代码与许多关于stackoverflow的类似问题的答案进行了比较，但是问题仍然存在。以下是我的应用程序中的相关代码。有人可以告诉我我做错了什么吗？

ViewController.h

IBOutlet UIImageView *topLeftImage;

-(IBAction)handleSingleTap:(UITapGestureRecognizer*)gestureView;

ViewController.m

- (void)viewDidUnload
{
    [super viewDidUnload];

    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
    topLeftImage.userInteractionEnabled = YES;
    [topLeftImage addGestureRecognizer:singleTap];

}

- (void)handleSingleTap:(UITapGestureRecognizer *)gestureRecognizer {

    NSLog(@"Tap detected.  Booyah!");
}

Answer 1

试试这个吧。您将代码放在viewDidUnload中，完全放在错误的位置。您需要viewDidLoad。

- (void)viewDidLoad
{
    [super viewDidLoad];

    UITapGestureRecognizer *singleTap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
    topLeftImage.userInteractionEnabled = YES;
    [topLeftImage addGestureRecognizer:singleTap];

}