进入appstore中指定的应用

1.进入appstore中指定的应用
NSString *str = [NSString stringWithFormat: 
                         @"itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa /wa/viewContentsUserReviews?type=Purple+Software&id=%d", 
                         myAppID ];  

        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];

        其中myAppID为itunesconnect中的应用程序id