关键是自动取版本信息：

[NSString stringWithFormat:@"Version %@",[[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"]];[NSString stringWithFormat:@"Build %@",[[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleVersion"]];

　　

然后对比服务器上的版本，这个你得自己通过WEB提供，示例中就先写出来：

#define APP_DownloadURL @"http://itunes.apple.com/app/id483504146?mt=8" //换成你自己的APP地址- (void)alertView:(UIAlertView *)alertView didDismissWithButtonIndex:(NSInteger)buttonIndex {    if (buttonIndex != [alertView cancelButtonIndex])     {       NSURL *url = [NSURL URLWithString:APP_DownloadURL];       [[UIApplication sharedApplication] openURL:url];    }}-(void)alertUpdate:(NSString *)strContent{    if (!isAlertUpdateShowed) {        isAlertUpdateShowed=YES;        UIAlertView *av = [[[UIAlertView alloc] initWithTitle:@"升级提示"                                                      message:strContent                                                     delegate:self       //委托给Self，才会执行上面的调用                                            cancelButtonTitle:@"以后再说"                                            otherButtonTitles:@"马上更新",nil] autorelease];        [av show];    }}-(void)checkUpdate{    NSString* sLastVersion=@"1.1"; //取最新的版本自己去实现    NSString* sLastVersionInfo=@"Test Update Check！"; //取最新的版本介绍自己去实现    if (![sLastVersion isEqualToString:[[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"]])    {         [self alertUpdate:sLastVersionInfo];    }}

　　还需要实现一些延时再提醒的处理。

 

转载自：http://www.cnblogs.com/gpwzw/archive/2012/03/31/2426698.html