#pragma mark -- 去 app store

- (void)jumpToAppStore{

      NSString *evaluateString = [NSString stringWithFormat:@"http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewContentsUserReviews?id=517198355&pageNumber=0&sortOrdering=2&type=Purple+Software&mt=8" ];

    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:evaluateString]];

}

#pragma mark -- 应用内

//苹果提供了一个框架StoreKit.framework,

//导入StoreKit.framework,在需要跳转的控制器里面添加头文件 #import,

//实现代理方法：< SKStorePRoductViewControllerDelegate >

- (void)loadAppStoreController

{

    //初始化控制器

    SKStoreProductViewController *storeProductViewContorller = [[SKStoreProductViewController alloc] init];

    //设置代理请求为当前控制器本身

    storeProductViewContorller.delegate = self;

    //加载一个新的视图展示

    [storeProductViewContorller loadProductWithParameters:

     //appId唯一的

     @{SKStoreProductParameterITunesItemIdentifier : @"517198355"} completionBlock:^(BOOL result, NSError *error) {

         //block回调

         if(error){

             NSLog(@"error %@ with userInfo %@",error,[error userInfo]);

         }else{

             //模态弹出appstore

             [self presentViewController:storeProductViewContorller animated:YES completion:^{

             }

              ];

         }

     }];

}

- (void)productViewControllerDidFinish:(SKStoreProductViewController *)viewController{

            [self dismissViewControllerAnimated:YES completion:^{

            }];

        }

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