iOS APP提示升级直接跳转到AppStore

从ituns里面复制的链接是：

https://itunes.apple.com/cn/app/tao-bao-sui-shi-sui-xiang/id387682726?mt=8

需要将https改成AppStore的urlSchemes，即itms-apps

最后用打开openURL方法打开该链接即可。如下：

NSString *urlStr = @"itms-apps://itunes.apple.com/cn/app/tao-bao-sui-shi-sui-xiang/id387682726?mt=8";
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlStr]];

补充：手机iTunes Store的urlSchemes为itms，不要弄混。

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"https://itunes.apple.com/cn/app/wan-zhuan-quan-cheng/id692579125?mt=8"]];