iOS7以前是这样的:
- NSString * nsStringToOpen = [NSString stringWithFormat: @"itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=%@",nsAppId ];
- [[UIApplication sharedApplication] openURL:[NSURL URLWithString:nsStringToOpen]];
找到应用程序的描述链接,比如:http://itunes.apple.com/gb/app/yi-dong-cai-bian/id391945719?mt=8
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"itms://itunes.apple.com/gb/app/yi-dong-cai-bian/id391945719?mt=8"]];