UIButtonBarItem 内的 UIActivityIndicatorView 无法正常工作

发布于 2024-08-17 01:49:07 字数 599 浏览 11 评论 0原文

我试图使用以下代码让 UIActivityIndicatorView 在 UIButtonBarItem 内部工作：

- (void)showActivityIndicator
{
    UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
    [activityIndicator startAnimating];

    UIBarButtonItem *activityBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:activityIndicator];
    [activityIndicator release];

    self.navigationItem.rightBarButtonItem = activityBarButtonItem;
    [activityBarButtonItem release];
}

它可以工作到显示活动指示器，但它不在按钮栏中。

有人对我在这里做错了什么有任何想法吗？

原文

I am trying to get a UIActivityIndicatorView to work inside of a UIButtonBarItem using the following code:

- (void)showActivityIndicator
{
    UIActivityIndicatorView *activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0, 0, 20, 20)];
    [activityIndicator startAnimating];

    UIBarButtonItem *activityBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:activityIndicator];
    [activityIndicator release];

    self.navigationItem.rightBarButtonItem = activityBarButtonItem;
    [activityBarButtonItem release];
}

It works to the point that the activity indicator is displayed, but it is not inside a button bar.

Does anyone have any ideas on what im doing wrong here?

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秋叶绚丽 2024-08-24 01:49:07

当我希望活动指示器出现在工具栏的左侧时，我就是这样做的：

activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0, 0.0, 25.0, 25.0)];
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
activityIndicator.hidesWhenStopped = YES;

UIBarButtonItem *btnActivity = [[UIBarButtonItem alloc] initWithCustomView:activityIndicator];
NSMutableArray *tItems = [self.toolbar.items mutableCopy];
[tItems insertObject:btnActivity atIndex:0];
self.toolbar.items = tItems;
[tItems release];

然后，在我的代码中，当我想要显示活动指示器时，我只需在正常情况下使用它即可way：

[activityIndicator startAnimating];

而且，当我不想再看到它时：

[activityIndicator stopAnimating];

This is what I did to get an activity indicator to appear when I wanted it to on the left-hand side of a toolbar:

activityIndicator = [[UIActivityIndicatorView alloc] initWithFrame:CGRectMake(0.0, 0.0, 25.0, 25.0)];
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyleGray;
activityIndicator.hidesWhenStopped = YES;

UIBarButtonItem *btnActivity = [[UIBarButtonItem alloc] initWithCustomView:activityIndicator];
NSMutableArray *tItems = [self.toolbar.items mutableCopy];
[tItems insertObject:btnActivity atIndex:0];
self.toolbar.items = tItems;
[tItems release];

Then, further on in my code when I want to show the activity indicator, I simply use it in the normal way: