iOS- UITapGestureRecognizer 提供 EXC_BAD_ACCESS答案

【问题标题】：iOS- UITapGestureRecognizer Gives EXC_BAD_ACCESSiOS- UITapGestureRecognizer 提供 EXC_BAD_ACCESS
【发布时间】：2014-03-07 14:46:20
【问题描述】：

我想在我的自定义标题类中添加点击事件。以下是我的代码。当我单击标题区域时，它会给出 EXC_BAD_ACCESS。

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{

    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        UITapGestureRecognizer *singleFingerTap =
        [[UITapGestureRecognizer alloc] initWithTarget:self
                                                action:@selector(handleSingleTap:)];
        [self.view addGestureRecognizer:singleFingerTap];

    }

    return self;
}

- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer {
    CGPoint location = [recognizer locationInView:[recognizer.view superview]];

    //Do stuff here...
}
- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

【问题讨论】：

尝试在viewDidLoad中进行分配代码。超后
获取 [_UIScrollViewAutomaticContentSizeConstraint handleSingleTap:]：在 viewdidload 中发送到实例 0x8c70800 时无法识别的选择器

标签： ios objective-c exc-bad-access

【解决方案1】：

//At View did load
UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(tapDetected:)];
    tapRecognizer.numberOfTapsRequired = 1;
    [self.view addGestureRecognizer:tapRecognizer];

- (void)tapDetected:(UITapGestureRecognizer *)tapRecognizer
{
   //addcodehere
}

【讨论】：

【解决方案2】：

如果您的自定义标头类是UIView 的子类，则使用self 而不是self.view

UITapGestureRecognizer *tapRecognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleSingleTap:)];
tapRecognizer.numberOfTapsRequired = 1;

[self.view addGestureRecognizer:tapRecognizer];

- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer {
    CGPoint location = [recognizer locationInView:[recognizer.view superview]];

//Do stuff here...
}

【讨论】：

应用程序没有进入handleSingleTap函数。
添加视图中的代码确实加载了，并且您还为 self.view 设置了用户交互
如果您的自定义标题类是 UIView 子类，则意味着使用 self 而不是 self.view
其实这是一个视图控制器。我想在它的视图中添加一个点击手势。我将它用作 UITable 视图标题。
你为什么要为 UIViewController 类添加子视图。你可以使用 UIView 本身

【解决方案3】：

也许这对你有帮助......

 {
    UITapGestureRecognizer *tapGestureRecognizer;
    self.view.backgroundColor = [UIColor whiteColor];
    /* Create the Tap Gesture Recognizer */
    self.tapGestureRecognizer = [[UITapGestureRecognizer alloc]
                                 initWithTarget:self action:@selector(handleTaps:)];
   self.tapGestureRecognizer.numberOfTouchesRequired = 2;

    self.tapGestureRecognizer.numberOfTapsRequired = 3;
    [self.view addGestureRecognizer:self.tapGestureRecognizer];
}
- (void) handleTaps:(UITapGestureRecognizer*)paramSender
{
    NSUInteger touchCounter = 0; for (touchCounter = 0;
                                      touchCounter < paramSender.numberOfTouchesRequired;
                                      touchCounter++)
    {
        CGPoint touchPoint =
        [paramSender locationOfTouch:touchCounter inView:paramSender.view];
        NSLog(@"Touch #%lu: %@",(unsigned long)touchCounter+1, NSStringFromCGPoint(touchPoint));
    }
}

【讨论】：

【解决方案4】：

尝试在 ViewDidLoad 中执行，而不是在 init 方法中执行。

- (void)viewDidLoad
{ 
    [super viewDidLoad];

    UITapGestureRecognizer *singleFingerTap =
    [[UITapGestureRecognizer alloc] initWithTarget:self
                                            action:@selector(handleSingleTap:)];
    [self.view addGestureRecognizer:singleFingerTap];
  // Do any additional setup after loading the view from its nib.
}

并将此方法包含在类扩展中，

- (void)handleSingleTap:(UITapGestureRecognizer *)recognizer ;

或者写在viewDidLoad之前。

【讨论】：

获取 [_UIScrollViewAutomaticContentSizeConstraint handleSingleTap:]：在 viewdidload 中发送到实例 0x8c70800 时无法识别的选择器
包括在内。但注意到发生了。