設定Activity Indicator View的顏色

    UIActivityIndicatorView *activityIndicatorView = [[UIActivityIndicatorView alloc] init];
    activityIndicatorView.color = [UIColor orangeColor];    
    [self.view addSubview:activityIndicatorView];
    [activityIndicatorView startAnimating];
    activityIndicatorView.center = self.view.center;

說明:

利用UIActivityIndicatorView的color property，設定UIActivityIndicatorView物件的顏色