为什么 UIIndicator 不移走？

发布于 2024-12-18 03:05:50 字数 910 浏览 4 评论 0原文

我在我的应用程序中使用 UIActivityIndicator。我为它编写了如下代码：

-(void)startSpinner {
    
    spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    spinner.hidden = NO;
    spinner.frame = CGRectMake(137, 160, 50, 50);
    [spinner setHidesWhenStopped:YES];
    [self.view addSubview:spinner];
    [self.view bringSubviewToFront:spinner];
    [spinner startAnimating];
}

我在 UIButton 的操作事件上调用此方法，并删除指示器，我编写代码如下：

-(void)stopSpinner {
    
    [spinner stopAnimating];
    [spinner removeFromSuperview];
    [spinner release];
}

单击按钮指示器出现，但当我在视图中调用 -(void)stopSpinner 方法时 willAppear 指示器不会消失。

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self stopSpinner];
   
}

即使我调试代码，我发现控制权也转到了 stopSpinner()。

这里有什么问题呢？

原文

I use UIActivityIndicator in my app. I have written code for it as follows:

-(void)startSpinner {
    
    spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    spinner.hidden = NO;
    spinner.frame = CGRectMake(137, 160, 50, 50);
    [spinner setHidesWhenStopped:YES];
    [self.view addSubview:spinner];
    [self.view bringSubviewToFront:spinner];
    [spinner startAnimating];
}

I call this method on the UIButton's action event, and to remove indicator I write the code as follows:

-(void)stopSpinner {
    
    [spinner stopAnimating];
    [spinner removeFromSuperview];
    [spinner release];
}

on click on the button indicator appears but when I call -(void)stopSpinner method in view
willAppear the indicator does not disapppear.

- (void)viewWillAppear:(BOOL)animated
{
    [super viewWillAppear:animated];
    [self stopSpinner];
   
}

Even I debug the code and I found that control also goes to the stopSpinner().

What is the problem here?

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萌无敌 2024-12-25 03:05:50

startSpinner 中可能存在潜在泄漏，因为您始终创建 UIActivityIndicatorView 而不释放它。像这样更改您的方法：

-(void)startSpinner {
    if (spinner){
        [spinner removeFromSuperview];
        [spinner release]; spinner = nil;
    }
    spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    spinner.frame = CGRectMake(137, 160, 50, 50);
    [spinner setHidesWhenStopped:YES];
    [self.view addSubview:spinner];
    [spinner startAnimating];
}

要停止动画，请为另一个 UIButton 操作分配 stopSpinner 。因为 viewWillAppear 会在您点击任何按钮之前触发。
附：也许你的意思是viewWillDisappear？

You might have potential leak in startSpinner because you always create UIActivityIndicatorView without releasing it. Change your method like this:

-(void)startSpinner {
    if (spinner){
        [spinner removeFromSuperview];
        [spinner release]; spinner = nil;
    }
    spinner = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];
    spinner.frame = CGRectMake(137, 160, 50, 50);
    [spinner setHidesWhenStopped:YES];
    [self.view addSubview:spinner];
    [spinner startAnimating];
}

For stopping animation assign stopSpinner for another UIButton action. Cos viewWillAppear will fired early then you tap on any button.
ps. maybe you mean viewWillDisappear?

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