一個不錯的IOS提示框 – MBProgressHUD

https://github.com/jdg/MBProgressHUD

MBProgressHUD works on any iOS version and is compatible with both ARC and non-ARC projects

      

Usage

The main guideline you need to follow when dealing with MBProgressHUD while running long-running tasks is keeping the main thread work-free, so the UI can be updated promptly. The recommended way of using MBProgressHUD is therefore to set it up on the main
thread and then spinning the task, that you want to perform, off onto a new thread.

[MBProgressHUD showHUDAddedTo:self.view animated:YES];dispatch_async(dispatch_get_global_queue( DISPATCH_QUEUE_PRIORITY_LOW, 0), ^{    // Do something...    dispatch_async(dispatch_get_main_queue(), ^{        [MBProgressHUD hideHUDForView:self.view animated:YES];    });});

If you need to configure the HUD you can do this by using the MBProgressHUD reference that showHUDAddedTo:animated: returns.

MBProgressHUD *hud = [MBProgressHUD showHUDAddedTo:self.view animated:YES];hud.mode = MBProgressHUDModeAnnularDeterminate;hud.labelText = @"Loading";[self doSomethingInBackgroundWithProgressCallback:^(float progress) {    hud.progress = progress;} completionCallback:^{    [hud hide:YES];}];

UI updates should always be done on the main thread. Some MBProgressHUD setters are however considered "thread safe" and can be called from background threads. Those also include setMode:, setCustomView:, setLabelText:, setLabelFont:,setDetailsLabelText:, setDetailsLabelFont: and setProgress:.

If you need to run your long-running task in the main thread, you should perform it with a slight delay, so UIKit will have enough time to update the UI (i.e., draw the HUD) before you block the main thread with your task.

[MBProgressHUD showHUDAddedTo:self.view animated:YES];dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, 0.01 * NSEC_PER_SEC);dispatch_after(popTime, dispatch_get_main_queue(), ^(void){    // Do something...    [MBProgressHUD hideHUDForView:self.view animated:YES];});

You should be aware that any HUD updates issued inside the above block won't be displayed until the block completes.

For more examples, including how to use MBProgressHUD with asynchronous operations such as NSURLConnection, take a look at the bundled demo project. Extensive API documentation is provided in the header file (MBProgressHUD.h).