应用内打开AppStore上某个应用的下载界面--SKStoreReviewController的使用

产品设计要求是这样的：

对应的初步代码是这样的：

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    UIImageView *imageView = [[UIImageView alloc] init];
    imageView.frame = CGRectMake(, , [UIScreen mainScreen].bounds.size.width, );
    imageView.image =  [UIImage imageNamed:@"123.jpeg"];
    [self.view addSubview:imageView];

}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    [self showStoreProductInApp:@""];
}

- (void)showStoreProductInApp:(NSString *)appID{

    Class isAllow = NSClassFromString(@"SKStoreProductViewController");

    if (isAllow != nil) {

        SKStoreProductViewController *sKStoreProductViewController = [[SKStoreProductViewController alloc] init];
        [sKStoreProductViewController setDelegate:self];
        [sKStoreProductViewController.view setFrame:CGRectMake(, , [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height - )];

        [self.view addSubview:sKStoreProductViewController.view];

        __weak typeof(self) weakSelf = self;
        [sKStoreProductViewController loadProductWithParameters:@{SKStoreProductParameterITunesItemIdentifier: appID}
                                                completionBlock:^(BOOL result, NSError *error) {
                                                    __strong typeof(weakSelf) strongSelf = weakSelf;

                                                    if (result) {
                                                        /*
                                                        // 也可以再这里实现该界面的预加载（会先出来一个连返回按钮都没有的空白页）
                                                        [strongSelf.view addSubview:sKStoreProductViewController.view];
                                                         */

                                                    }else{
                                                        NSLog(@"error:%@",error);
                                                    }
                                                }];
    }else{
        //低于iOS6的系统版本没有这个类,不支持这个功能
        NSString *string = [NSString stringWithFormat:@"itms-apps://itunes.apple.com/xxxxxxx/app/id%@?mt=8",appID];
        [[UIApplication sharedApplication] openURL:[NSURL URLWithString:string]];
    }
}

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

    [viewController.view removeFromSuperview];
}

对应的初步效果是这样的：

（<--- iOS11以后）（<--- iOS11之前）

后面再严格按照UE的效果进行微调设计就可以了。