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(Swift) UIImagePickerController照片选择器UIImagePickerControllerReferenceURL的问题

今天在定位一个照片选择奔溃闪退的问题，真机测试所有iPhone运行正常，ipad测试中使用ipad Air ios8的时候总算问题复现了。下面我总结一下自己测试一天才测试出来的bug。

现象：点击个人主页头像，进行照片选择，点击照片，应用程序闪退。

iOS 获取图片有三种方法：

1. 直接调用摄像头拍照

2. 从相册中选择

3. 从图库中选择

UIImagePickerControllerSourceTypePhotoLibrary：表示显示所有的照片

UIImagePickerControllerSourceTypeCamera：表示从摄像头选取照片

UIImagePickerControllerSourceTypeSavedPhotosAlbum：表示仅仅从相册中选取照片。

allowEditing和allowsImageEditing 设置为YES，表示允许用户编辑图片，否则，不允许用户编辑。

代码如下：

1     @IBAction func onCoverClick(sender: AnyObject) { 2         if (UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum)) { 3             self.coverChanging = true 4  5             let actionSheet = UIActionSheet( title: Localized.PHOTO_CHOSE_SOURCE, delegate: self, cancelButtonTitle:Localized.DIALOG_BUTTON_CANCEL , destructiveButtonTitle: nil, otherButtonTitles: Localized.PHOTO_FROM_CAMERA, Localized.PHOTO_FROM_PHOTO ) 6             actionSheet.showInView(self.view) 7         } 8     }

//MARK: - uiactionsheetDelegate  func actionSheet(actionSheet: UIActionSheet, clickedButtonAtIndex buttonIndex: Int)  {   Flurry.logEvent("Clicked change user avatar")   if buttonIndex == 1 {    if(UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera)) {     let picker = UIImagePickerController()     picker.sourceType = UIImagePickerControllerSourceType.Camera     picker.mediaTypes = [kUTTypeImage]     picker.delegate = self     if UIImagePickerController.isCameraDeviceAvailable(UIImagePickerControllerCameraDevice.Front) {      picker.cameraDevice = UIImagePickerControllerCameraDevice.Front     } else {      picker.cameraDevice = UIImagePickerControllerCameraDevice.Rear     }     delay(0, { () -> () in     currentNav().presentViewController(picker, animated: true, completion: nil)     })    }   } else if buttonIndex == 2 {    if (UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.SavedPhotosAlbum)) {     let picker = UIImagePickerController()     picker.sourceType = UIImagePickerControllerSourceType.PhotoLibrary     picker.mediaTypes = [kUTTypeImage]     picker.allowsEditing = false     picker.delegate = self     delay(0, { () -> () in      currentNav().presentViewController(picker, animated: true, completion: nil)     })    }   }  }

下面是有bug的代码：如下，直接获取info字典中 UIImagePickerControllerOriginalImage 的 image，然后使用框架赋值操作

 1     func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [NSObject : AnyObject]) {  2         MBProgressHUD.showHUDAddedTo(self.view, animated: true, needMask: false)  3         let img = info[UIImagePickerControllerOriginalImage] as! UIImage  4         var cropCtrl: RSKImageCropViewController  5         if self.coverChanging {  6             let width = min(UIScreen.mainScreen().bounds.size.width , UIScreen.mainScreen().bounds.size.height)  7             cropCtrl = RSKImageCropViewController(image: img, cropMode: RSKImageCropMode.Custom, cropSize: CGSizeMake(width, width * 10 / 16))  8         } else {  9             cropCtrl = RSKImageCropViewController(image: img, cropMode: RSKImageCropMode.Circle, cropSize: CGSizeMake(512, 512)) 10         } 11         cropCtrl.delegate = self 12         picker.dismissViewControllerAnimated(false, completion: { [unowned self]() -> Void in 13             self.presentViewController(cropCtrl, animated: false, completion: nil) 14             }) 15     }

代码在iPhone下测试没有问题。在ipad air上测试直接崩溃，我打印出info信息如下：

[" UIImagePickerControllerReferenceURL ": assets-library://asset/asset.JPG?id=7136137D-8D6C-409D-A4A4-7520924F4AD4&ext=JPG, "UIImagePickerControllerMediaType": public.image]

下面来看看正常的打印info信息的输出：

[" UIImagePickerControllerOriginalImage ": <UIImage: 0x188a1010> size {480, 640} orientation 3 scale 1.000000, "UIImagePickerControllerMediaMetadata": {

DPIHeight = 72;

DPIWidth = 72;

Orientation = 6;

"{Exif}" = {

ApertureValue = "2.526068811667588";

BrightnessValue = "4.991759637258034";

ColorSpace = 1;

DateTimeDigitized = "2015:10:15 15:32:42";

DateTimeOriginal = "2015:10:15 15:32:42";

ExposureBiasValue = 0;

ExposureMode = 0;

ExposureProgram = 2;

ExposureTime = "0.007518796992481203";

FNumber = "2.4";

Flash = 32;

FocalLenIn35mmFilm = 35;

FocalLength = "1.85";

ISOSpeedRatings = (

125 );

LensMake = Apple;

LensModel = "iPad 2 front camera 1.85mm f/2.4";

LensSpecification = (

"1.85",

"2.4",

"2.4"

);

MeteringMode = 5;

PixelXDimension = 640;

PixelYDimension = 480;

SceneType = 1;

SensingMethod = 2;

ShutterSpeedValue = "7.059855806488952";

SubsecTimeDigitized = 674;

SubsecTimeOriginal = 674;

WhiteBalance = 0;

};

"{MakerApple}" = {

1 = 2;

3 = {

epoch = 0;

flags = 1;

timescale = 1000000000;

value = 9309095690750;

};

4 = 1;

5 = 200;

6 = 224;

7 = 1;

8 = (

"0.006874616",

"-0.2249842",

"-0.9852664"

);

};

"{TIFF}" = {

DateTime = "2015:10:15 15:32:42";

Make = Apple;

Model = "iPad 2";

Software = "8.3";

XResolution = 72;

YResolution = 72;

};

}, "UIImagePickerControllerMediaType": public.image]

从这里可以看出来，直接取值是有很大问题的。

(Swift) UIImagePickerController照片选择器UIImagePickerControllerReferenceURL的问题

所以我进行了如下操作，判断取值，如果最后imge仍没有值，弹框提示用户重新选择照片。代码如下：

需要导入：

import AssetsLibrary

 1    // MARK : - imageCrop  2     func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) {  3         MBProgressHUD.showHUDAddedTo(self.view, animated: true, needMask: false)  4         var img = UIImage()  5         if  info[UIImagePickerControllerOriginalImage] != nil {  6             img = info[UIImagePickerControllerOriginalImage] as! UIImage  7             self.showRSkImageCropController(picker, img: img)  8         } else if info[UIImagePickerControllerReferenceURL] != nil {  9             let imageUrl = info[UIImagePickerControllerReferenceURL] as! NSURL 10             let assetLibrary = ALAssetsLibrary() 11             assetLibrary.assetForURL(imageUrl, resultBlock: { (asset:ALAsset?) -> Void in 12                 if let imageRef = asset?.defaultRepresentation().fullScreenImage() { 13                     img = UIImage(CGImage: imageRef as! CGImageRef) 14                     self.showRSkImageCropController(picker, img: img) 15                 } else { 16                     let imageActionSheet =  UIActionSheet(title:Localized.PHOTO_CHOSE_ERROR, delegate: nil, cancelButtonTitle:Localized.DIALOG_BUTTON_CANCEL, destructiveButtonTitle:Localized.DIALOG_BUTTON_OK) 17                     imageActionSheet.showInView(picker.view) 18                 } 19                 }) { (error:NSError?) -> Void in 20                     let imageActionSheet =  UIActionSheet(title:Localized.PHOTO_CHOSE_ERROR, delegate: nil, cancelButtonTitle:Localized.DIALOG_BUTTON_CANCEL, destructiveButtonTitle:Localized.DIALOG_BUTTON_OK) 21                     imageActionSheet.showInView(picker.view) 22             } 23         } 24     } 25  26     func showRSkImageCropController(picker:UIImagePickerController,img:UIImage) { 27         var cropCtrl: RSKImageCropViewController 28         if self.coverChanging { 29             let width = min(UIScreen.mainScreen().bounds.size.width , UIScreen.mainScreen().bounds.size.height) 30             cropCtrl = RSKImageCropViewController(image: img, cropMode: RSKImageCropMode.Custom, cropSize: CGSizeMake(width, width * 10 / 16)) 31         } else { 32             cropCtrl = RSKImageCropViewController(image: img, cropMode: RSKImageCropMode.Circle, cropSize: CGSizeMake(512, 512)) 33         } 34         cropCtrl.delegate = self 35         picker.dismissViewControllerAnimated(false, completion: { [unowned self]() -> Void in 36             self.presentViewController(cropCtrl, animated: false, completion: nil) 37             }) 38     }