檢查提取的對象是Swift中的Image還是Video

Question

我想檢查latestObject是什麼類型。下面是一些代碼：

allMedia = PHAsset.fetchAssetsWithOptions(fetchOptions) 
let allPhotos = PHAsset.fetchAssetsWithMediaType(.Image, options: fetchOptions) 
let allVideo = PHAsset.fetchAssetsWithMediaType(.Video, options: fetchOptions) 
print("Found \(allMedia.count) media") 
print("Found \(allPhotos.count) images") 
print("Found \(allVideo.count) videos") 

let latestObject: AnyObject! = allMedia.lastObject 

// How to check what type latestObject is? 
// I think something with mediaType but how is it exactly going? 

Answer 1

你有沒有嘗試過這樣的事情：

if let asset = allMedia.lastObject as? PHAsset { 
    switch asset.mediaType { 
    case .Image: 
     print("Image") 
    case .Video: 
     print("Video") 
    case .Audio: 
     print("Audio") 
    default: 
     print("Unknown") 
    } 
} 

包含在PHFetchResult每個元素都是一個PHAsset（在這種情況下）。 因此，在鑄造到PHAsset時，您可以訪問屬性mediaType。

Answer 2

You can check it in UIImagePickerController delegate method 

func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { 

    if((info["UIImagePickerControllerMediaType"] as! String) == "public.movie"){ 
    // Video file 
    } 
    else{ 
    // Image 
    } 
}