swift中的GIF文件

Question

通過從系統中拖動文件將.gif文件導入到xcode模擬器時，自動將其轉換爲.png文件。

Answer 1

如果要從Xcode的模擬器相機庫導入gif文件，請確保從模擬器的safari下載.gif文件，或將gif從應用程序保存到相機庫。 如果我們通過從系統拖動文件將.gif文件導入到xcode模擬器，它將自動轉換爲.png文件。

let savingPath : AnyObject = NSSearchPathForDirectoriesInDomains(.DocumentDirectory,.UserDomainMask,true)[0] 

    var library:ALAssetsLibrary? = ALAssetsLibrary() 
    var referenceURL : NSURL = info[UIImagePickerControllerReferenceURL] as! NSURL 
    library!.assetForURL(referenceURL, resultBlock: { (asset : ALAsset!) -> Void in 
     var assetRep : ALAssetRepresentation = asset.defaultRepresentation() 
     let sizeOfRawDataInBytes: Int = Int(assetRep.size()) 
     var rawData: NSMutableData = NSMutableData(length: sizeOfRawDataInBytes)! 
     var bufferPtr: UnsafeMutablePointer<Void> = rawData.mutableBytes 
     var bufferPtr8: UnsafeMutablePointer<UInt8> = UnsafeMutablePointer<UInt8>(bufferPtr) 

     var error: NSError? = nil 
     var buffered = assetRep.getBytes(bufferPtr8, fromOffset: 0, length: sizeOfRawDataInBytes, error: &error) 
     let newData: NSData = NSData(bytesNoCopy: bufferPtr8, length: buffered, freeWhenDone: false) 

     newData.writeToFile(savingPath , atomically: true)