iOS app评分功能

NSString *baseUrl =[NSString stringWithFormat:@"itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&onlyLatestVersion=true&pageNumber=0&sortOrdering=1&id=%@",kAppId];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:baseUrl]];

kAppId 是指 app的在商店的ID