Ios5 MBProgressHUD添加到应用程序窗口

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我需要将hud添加到我的应用程序窗口中，所以我使用了上述代码，但无法工作。有人能帮我吗？

首先，您需要按如下所示分配初始化它

`UIWindow *tempKeyboardWindow = [[[UIApplication sharedApplication] windows]objectAtIndex:0];


MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:tempKeyboardWindow animated:YES];

hud.animationType = MBProgressHUDAnimationZoomOut;

hud.dimBackground = YES;

hud.labelText = showString;

然后设置它的必需属性，如下所示

self.progressHud = [[MBProgressHUD alloc]initWithView:self.navigationController.view];

然后使用下面的代码来显示它

self.progressHud.labelText = @"Processing Image";
self.progressHud.dimBackground = YES;
self.progressHud.animationType = MBProgressHUDAnimationZoom;
self.progressHud.delegate = self;

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在self.window.rootViewController.view上显示MBProgressHUD

[self.navigationController.view addSubview:self.progressHud];
[self.progressHud show:NO];