IOS:UILongPressGestureRecognizer EXC_BAD_ACCESS

Question

我在 viewDidLoad 中有这段代码:

UILongPressGestureRecognizer *change = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(dragGestureChange:)];
    [imageView addGestureRecognizer:change];
    for (UILongPressGestureRecognizer *gestureRecognizer in imageView.gestureRecognizers)
    {
        [gestureRecognizer requireGestureRecognizerToFail:change];
    }

当我调用这个代码在哪里的类时，第一次一切正常，但第二次崩溃，因为 EXC_BAD_ACCESS；如果我使用 scrollView 而不是 imageView 就不会发生，为什么？？？

Answer 1

使用此代码，您需要所有识别器(包括更改)失败才能使更改成功，这不太好

UILongPressGestureRecognizer *change = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(dragGestureChange:)];
[imageView addGestureRecognizer:change];
for (UILongPressGestureRecognizer *gestureRecognizer in imageView.gestureRecognizers)
{
    [gestureRecognizer requireGestureRecognizerToFail:change];
}

你应该改成这样

UILongPressGestureRecognizer *change = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(dragGestureChange:)];
for (UILongPressGestureRecognizer *gestureRecognizer in imageView.gestureRecognizers)
{
    [gestureRecognizer requireGestureRecognizerToFail:change];
}
[imageView addGestureRecognizer:change];

你应该在这里发布更改。不知道这是否真的能解决您的问题，在您发布的内容中看不到任何其他错误。