APP跳转AppStore

//去评分
NSString *APPID = @"your appid";
NSString *urlStr = [NSString stringWithFormat:@"itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=%@&pageNumber=0&sortOrdering=2&mt=8", APPID];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlStr]];

//详情
NSString *urlStr = [NSString stringWithFormat:@"itms-apps://itunes.apple.com/app/id%@", APPID];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlStr]];