试试这个方法

http://itunes.apple.com/lookup?id=“你的应用ID在这里”返回json。从这里，找到键“trackViewUrl”和值是所需的url。使用这个url(只需将https://替换为itms-apps://)。这工作得很好。

例如，如果你的应用ID是xyz，那么就转到这个链接 http://itunes.apple.com/lookup?id=xyz

然后找到“trackViewUrl”键的url。这是你的应用程序在应用商店的url，在xcode中使用这个url试试这个

NSString *iTunesLink = @"itms-apps://itunes.apple.com/us/app/Your app name/id Your app ID?mt=8&uo=4";
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:iTunesLink]];

谢谢

如果你想链接到开发商的应用，而开发商的名字中有标点符号或空格(例如Development Company, LLC)，你的URL是这样的:

itms-apps://itunes.com/apps/DevelopmentCompanyLLC

否则它在iOS 4.3.3上返回“此请求不能被处理”

当支持多个操作系统和平台时，创建链接可能会成为一个复杂的问题。例如，在iOS 7上不支持WebObjects(其中一些)，你创建的一些链接会打开另一个国家的商店，然后用户的等等。

有一个叫做iLink的开源库可以帮助你。

There advantages of this library is that the links would be found and created at run time (the library would check the app ID and the OS it is running on and would figure out what link should be created). The best point in this is that you don't need to configure almost anything before using it so that is error free and would work always. That's great also if you have few targets on same project so you don't have to remember which app ID or link to use. This library also would prompt the user to upgrade the app if there is a new version on the store (this is built in and you turn this off by a simple flag) directly pointing to the upgrade page for the app if user agrees.

复制两个库文件到你的项目(iLink.h & iLink.m)。

在你的appDelegate.m上:

#import "iLink.h"

+ (void)initialize
{
    //configure iLink
    [iLink sharedInstance].globalPromptForUpdate = YES; // If you want iLink to prompt user to update when the app is old.
}

例如，在你想打开评级页面的地方，只需使用:

[[iLink sharedInstance] iLinkOpenAppPageInAppStoreWithAppleID: YOUR_PAID_APP_APPLE_ID]; // You should find YOUR_PAID_APP_APPLE_ID from iTunes Connect 

不要忘记在同一个文件中导入iLink.h。

这里有一个很好的整个库的文档还有一个iPhone和Mac的示例项目。

根据苹果公司的最新文件 你需要使用

appStoreLink = "https://itunes.apple.com/us/app/apple-store/id375380948?mt=8"  

或

SKStoreProductViewController 

这是工作和直接链接在ios5

NSString *iTunesLink = @"http://itunes.apple.com/app/baseball-stats-tracker-touch/id490256272?mt=8";  
[[UIApplication sharedApplication] openURL:[NSURL URLWithString:iTunesLink]];

我认为苹果已经为应用程序链接提供了一个新的链接: https://apps.apple.com/app/id1445530088或https://apps.apple.com/app/ {your_app_id}