iOS-界面显示"正在下载"菊花

状态栏也显示下载指示器

//开启状态栏动画
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:YES];
    //关闭状态栏动画
    [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];

 UIActivityIndicatorView *avi = [[UIActivityIndicatorView alloc] initWithActivityIndicatorStyle:UIActivityIndicatorViewStyleWhiteLarge];

[avi startAnimating];

下载数据以前:

//显示正在下载数据对话框
    [MMProgressHUD setPresentationStyle:MMProgressHUDPresentationStyleShrink];
    [MMProgressHUD showWithTitle
:@"提示" status
:@"正在下载”
];

下载完成数据以后:

  //
        [MMProgressHUD dismissWithSuccess:@"下载完成"];

        [[UIApplication sharedApplication] setNetworkActivityIndicatorVisible:NO];