//评分功能
NSString *str = [NSStringstringWithFormat: @"itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=%@", _strAppID]; _strAppID为app id
[[UIApplicationsharedApplication] openURL:[NSURLURLWithString:str]];
//应用下载地址
@"https://itunes.apple.com/hk/app/apple-store/id(app id)?mt=8"