iOS应用直接调跳转到评价页面和应用下载页面

    //跳转到应用页面

    NSString *str = [NSString stringWithFormat:@"http://itunes.apple.com/us/app/id%d",appid];

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

    //跳转到评价页面

    NSString *str = [NSString stringWithFormat:@"itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id;=%d",  appid];

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