IOS内购时的Loading实现-MBProgressHUD

MBProgressHUD是替代UIProgressHUD的一个小工具，使用方法也非常简单

下载地址是： http://github.com/matej/MBProgressHUD

#import <UIKit/UIKit.h>#import "MBProgressHUD.h" @interface HudDemoViewController : UIViewController <MBProgressHUDDelegate> {    MBProgressHUD *HUD;} - (IBAction) showWithLabel:(id)sender; - (void) myTask; @end@implementation HudDemoViewController- (IBAction) showWithLabel:(id)sender {// Should be initialized with the windows frame so the HUD disables all user input by covering the entire screenHUD = [[MBProgressHUD alloc] initWithWindow:[UIApplication sharedApplication].keyWindow];// Add HUD to screen[self.view.window addSubview:HUD];// Regisete for HUD callbacks so we can remove it from the window at the right timeHUD.delegate = self;HUD.labelText = @"Loading";// Show the HUD while the provided method executes in a new thread[HUD showWhileExecuting:@selector(myTask) onTarget:self withObject:nil animated:YES];}- (void) myTask {// Do something usefull in here instead of sleeping ...sleep(3);}- (void)hudWasHidden {// Remove HUD from screen when the HUD was hidded[HUD removeFromSuperview];[HUD release];}@end