在導航欄中顯示進度指示器

Question

我想在導航欄中顯示旋轉進度指示器以代替按鈕（刷新）時的標題，當刷新成功時，指示器消失並且標題將再次顯示。

有什麼建議嗎？謝謝。

Answer 1

您可以添加UIActivityIndi​​catorView到UInavigatiobar類似的代碼： -

UIView *activityView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 44)]; 
activityView.backgroundColor = [UIColor clearColor]; 
UIActivityIndicatorView *act =[[UIActivityIndicatorView alloc] init]; //create this globule so u can stop it while your progress finished 
act.frame=CGRectMake(0, 0, 30, 30); 
[activityView addSubview:act]; 
self.navigationItem.titleView = activityView; 

注： - [act startAnimating];和[act stopAnimating];與參數您的需要

或者你也可以加入到UInavigation BarbuttonItem

UIView *activityView = [[UIView alloc] initWithFrame:CGRectMake(0,0,30,30)]; 
    UIActivityIndicatorView *act =[[UIActivityIndicatorView alloc] init]; 
    act.frame=CGRectMake(0, 0, 30, 30); 
    UIBarButtonItem *actItem = [[[UIBarButtonItem alloc] initWithCustomView:activityView] autorelease]; 
    [activityView addSubview:act]; 
    self.navigationItem.rightBarButtonItem = actItem; 

這個

注意： - [UIActivityIndicatorView startAnimating];和[UIActivityIndicatorView stopAnimating];因爲你的需要