ios应用增加给appstore评分和进入app安装页面代码功能

NSString *str = [NSString stringWithFormat: @"itms-apps://ax.itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?type=Purple+Software&id=%@", @"954270"];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];

NSString *str2 = [NSString stringWithFormat: @"itms-apps://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=%@",  @"954270"];
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:str2]];