iOS：UILongPressGestureRecognizer EXC_BAD_ACCESS

发布于 2024-12-18 07:29:35 字数 507 浏览 2 评论 0原文

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，但第二次它崩溃，因为 EXC_BAD_ACCESS;如果我使用scrollView而不是imageView，就不会发生这种情况，为什么？？？

原文

I have this code in viewDidLoad:

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

when I call the class where is this code, the first time it's all ok , but the second time it crash because EXC_BAD_ACCESS; it don't happens if instead of an imageView I use a scrollView, why???

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甜心 2024-12-25 07:29:35

使用此代码，您需要所有识别器（包括更改）失败才能更改成功，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];
}

您应该将其更改为此

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

并且您应该在此处发布更改。不知道这是否能真正解决您的问题，在您发布的内容中看不到任何其他错误。

With this code, you are requiring all recognizers (including change) to fail for change to succeed, which cannot be good

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

you should change it to this

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

And you should release change here. Don't know if that will actually solve your problem, can't see anything else wrong in what you posted.

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