將UIActivityIndi​​catorView添加到UIBarButton中

Question

如何將UIActivityIndi​​catorView微調器圓添加到UIBarButton中，以便當用戶點擊導航欄上的這些按鈕之一時，它們在加載發生時看到微調器？

Answer 1

如果你想顯示的導航欄按鈕的活動輪（例如，你可能對你的導航欄刷新按鈕） - 你可以用自定義視圖作爲UIActivityIndicatorView創建一個新的UIBarButtonItem：

目標C

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

夫特

let uiBusy = UIActivityIndicatorView(activityIndicatorStyle: .White) 
uiBusy.hidesWhenStopped = true 
uiBusy.startAnimating() 
self.navigationItem.rightBarButtonItem = UIBarButtonItem(customView: uiBusy) 

這會用旋轉輪蓋寫您的rightBarButtonItem。完成後，只需重新創建rightBarButtonItem即可。

Answer 2

UIActivityIndi​​catorView是一種視圖。將其框架設置在您的按鈕中，並使用-addSubview將其添加到UIBarButton的視圖層次結構中。

我簡單化，因爲你必須設法使其適合空間（可能通過縮放）和居中......

Answer 3

僞代碼，我不打算在Xcode中檢查這一點，但東西像這樣應該工作：

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

Answer 4

其實活動指標不會被添加爲工具欄項目。這是當前觀點的子視圖。

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

請記住在-(void)dealloc中發佈它。

Answer 5

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

將以下何地需要：

[activityIndicator startAnimating]; 
[activityIndicator stopAnimating]; 

Answer 6

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; 

}