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【Swift】应用内显示 AppStore 某个应用的详情

日期：2017-12-03点击：429收藏

　一般网上的文章的代码：

    func openAppStore(url: String){
        if let number = url.rangeOfString("[0-9]{9}", options: NSStringCompareOptions.RegularExpressionSearch) {
            let appId = url.substringWithRange(number)
            let productView = SKStoreProductViewController()
            productView.delegate = self
            productView.loadProductWithParameters([SKStoreProductParameterITunesItemIdentifier : appId], completionBlock: { [weak self](result: Bool, error: NSError?) -> Void in
                if result {
                    self?.presentViewController(productView, animated: true, completion: nil)
                } else {
                    self?.openAppUrl(url)
                }
            })
        } else {
            openAppUrl(url)
        }
    }
    
    private func openAppUrl(url: String) {
        let nativeURL = url.stringByReplacingOccurrencesOfString("https:", withString: "itms-apps:")
        if UIApplication.sharedApplication().canOpenURL(NSURL(string:nativeURL)!) {
            UIApplication.sharedApplication().openURL(NSURL(string:url)!)
        }
    }
    
    func productViewControllerDidFinish(viewController: SKStoreProductViewController) {
        viewController.dismissViewControllerAnimated(true, completion: nil)
    }

　　　　实现的效果很好，就是很慢，点击按钮调用 openAppStore 要很久才能显示出界面，就算加一个转圈效果也很差。原因是因为要去 linkmaker.itunes.apple.com 根据 identifier 查找链接，仔细看代码我们会发现 presentViewController 是在查找到结果才被调用，其实我们可以不用让界面现出来，虽然时间是一样的，但是用户体验会很好，修改后代码如下：

    func openAppStore(url: String){
        if let number = url.rangeOfString("[0-9]{9}", options: NSStringCompareOptions.RegularExpressionSearch) {
            let appId = url.substringWithRange(number)
            let productView = SKStoreProductViewController()
            productView.delegate = self
            productView.loadProductWithParameters([SKStoreProductParameterITunesItemIdentifier : appId], completionBlock: { [weak self](result: Bool, error: NSError?) -> Void in
                if !result {
                    productView.dismissViewControllerAnimated(true, completion: nil)
                    self?.openAppUrl(url)
                }
            })
            self.presentViewController(productView, animated: true, completion: nil)
        } else {
            openAppUrl(url)
        }
    }
    
    private func openAppUrl(url: String) {
        let nativeURL = url.stringByReplacingOccurrencesOfString("https:", withString: "itms-apps:")
        if UIApplication.sharedApplication().canOpenURL(NSURL(string:nativeURL)!) {
            UIApplication.sharedApplication().openURL(NSURL(string:url)!)
        }
    }
    
    func productViewControllerDidFinish(viewController: SKStoreProductViewController) {
        viewController.dismissViewControllerAnimated(true, completion: nil)
    }