将UIActivityIndi​​catorView添加到UIBarButton中

Question

如何将UIActivityIndi​​catorView微调器圆圈添加到UIBarButton中，以便当用户点击导航栏上的其中一个按钮时，他们会在加载时看到微调器？

Answer 1

如果您尝试在导航栏按钮中显示活动轮（例如，导航栏上可能有刷新按钮） - 您可以创建一个新的UIBarButtonItem，其自定义视图为{{1 }}：

<强>目标C

UIActivityIndicatorView

<强>夫特

uiBusy = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
uiBusy.hidesWhenStopped = YES;
[uiBusy startAnimating];
[self.navigationItem.rightBarButtonItem initWithCustomView:uiBusy];

这会用旋转轮覆盖你的let uiBusy = UIActivityIndicatorView(activityIndicatorStyle: .White) uiBusy.hidesWhenStopped = true uiBusy.startAnimating() self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: uiBusy) 。完成后，只需重新创建rightBarButtonItem。

Answer 2

activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
activityIndicator.hidesWhenStopped = YES;
self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:activityIndicator];

在需要的地方放置以下内容：

[activityIndicator startAnimating];
[activityIndicator stopAnimating];

Answer 3

实际上，活动指示符未添加为工具栏项。这是当前观点的子视图。

    UIActivityIndicatorView *act = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
    [act setCenter:CGPointMake(20, 20)];
    [act startAnimating];
    [self.view addSubview:act];

请务必在-(void)dealloc中发布。

Answer 4

使用此方法

-(void)startAniatingActivityIndicator{
@try {
    activityIndicator = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhite];
    activityIndicator.frame = CGRectMake(self.window.frame.size.width-30, 32.5, activityIndicator.bounds.size.width, activityIndicator.bounds.size.height);
    [self.window addSubview:activityIndicator];
    [activityIndicator startAnimating];
    [self.window bringSubviewToFront:activityIndicator];
}
@catch (NSException *exception) {

}
@finally {

}

}

-(void)stopAniatingActivityIndicator{
[activityIndicator stopAnimating];
[activityIndicator removeFromSuperview];
activityIndicator = nil;

}

Answer 5

UIActivityIndi​​catorView是一种视图。将其框架设置在您的按钮内，并使用-addSubview将其添加到UIBarButton的视图层次结构中。

我过于简单了，因为你必须尝试使它适合空间（可能通过缩放）并使其居中......

Answer 6

伪代码，我不会在Xcode中检查这个，但是这样的东西应该有效：

UIActivityIndicatorView *act = [[UIActivityIndicatorView alloc] init];
act.frame = CGMakeRect(3,3,25,25);
[myBarButton addSubview:act];
[act release];