iOS Swift，如何爲不同的文件擴展名聲明？

Question

我正在開發一款適用於iOS Runnign的Swift應用，可以在播放器中播放一些視頻和圖像;

我打電話是爲了喜歡的視頻文件：

videoView.displayMode = GVRWidgetDisplayMode.fullscreen 

和圖像：

imageView.displayMode = GVRWidgetDisplayMode.fullscreen 

我想有一個if語句，等等;

如果正在調用的文件是.png，則通過imageViewer啓動它;

上面添加的代碼是被調用：

如果文件是MP4，通過視頻查看

我在本地調用文件啓動它（

let urlString = "\(postslogin[selectedIndexPath].link)" 

    let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] 
    let fileName = urlString as NSString; 
    let filePath="\(documentsPath)/\(fileName.lastPathComponent)"; 

    let fileURL = NSURL.init(fileURLWithPath: filePath) 
    let request = NSURLRequest.init(url: fileURL as URL) 

被perviously通過下載）來自super.viewDidLoad。

任何建議將超級！

謝謝:) :)

---編輯新建---

到目前爲止，我已經嘗試：

let urlString = "\(postslogin[selectedIndexPath].link)" 

    let documentsPath = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] 

    let fileName = urlString as NSString; 
    let filePath="\(documentsPath)/\(fileName.lastPathComponent)"; 

    let fileURL = NSURL.init(fileURLWithPath: filePath) 

     let request = NSURLRequest.init(url: fileURL as URL) 
    if (fileURL.pathExtension == "jpg") { 

    imageVRView.load(UIImage(named: "\(documentsPath)/\(fileName.lastPathComponent)"), 

        of: GVRPanoramaImageType.mono) 
     imageVRView.displayMode = GVRWidgetDisplayMode.fullscreen 


    } 
     else if (fileURL.pathExtension == "mp4") { 

       videoVRView.displayMode = GVRWidgetDisplayMode.fullscreen 

     videoVRView.load(from: URL((fileURLWithPath: filePath)) 

      ) 
    } 

沒有成功:(:(

Answer 1

if (fileURL.pathExtension == "png") { 
    // image 
} else if (fileURL.pathExtension == "mp4") { 
    // video 
}