应用内直接跳转到Appstore

iOS开发中，应用内直接跳转到Appstore
1.进入appstore中指定的应用
NSString *str = [NSString stringWithFormat: @"itms://itunes.apple.com/us/app/san-ban+/id1050067747?l=zh&ls=1&mt=8";

        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:str]];
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2.进入首页

NSString *str = [NSString stringWithFormat: 

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