iphone软件点击评价按钮进入评论页面方法

 NSString *str = [NSString stringWithFormat:@"itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=%d", 510277436/*程序id*/ ];  
 [[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];