前言

	NS_CLASS_AVAILABLE_IOS(2_0) @interface UIImagePickerController : UINavigationController <NSCoding>
@available(iOS 2.0, *) public class UIImagePickerController : UINavigationController, NSCoding
  • iOS 获取图片有三种方法:

    • 直接调用摄像头拍照;
    • 从相册中选择;
    • 从图库中选择。
  • UIImagePickerController 是系统提供的用来获取图片和视频的接口。用 UIImagePickerController 类来获取图片视频,大体分为以下几个步骤:

    • 初始化 UIImagePickerController 类;
    • 设置 UIImagePickerController 实例的数据来源类型;
    • 设置代理;
    • 如果需要做图片修改的话设置 allowsEditing = YES。

1、imagePickerController 的创建

  • Objective-C

    • 需遵守协议 UIImagePickerControllerDelegate, UINavigationControllerDelegate

      	// 实例化 UIImagePickerController 对象
      
      		UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
      
      		// 设置代理
      imagePickerController.delegate = self; // 设置是否需要做图片编辑,default NO
      imagePickerController.allowsEditing = YES; // 判断数据来源是否可用
      if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) { // 设置数据来源
      imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; // 打开相机/相册/图库
      [self presentViewController:imagePickerController animated:YES completion:nil];
      } // UIImagePickerControllerDelegate 协议方法 // 取消选择
      - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { // 退出当前界面
      [picker dismissViewControllerAnimated:YES completion:nil];
      } // 选择完成
      - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width,
      self.view.frame.size.height - 20)];
      [self.view addSubview:imageView]; // 获取点击的图片
      imageView.image = [info objectForKey:UIImagePickerControllerOriginalImage]; [picker dismissViewControllerAnimated:YES completion:nil];
      }
  • Swift

    • 需遵守协议 UIImagePickerControllerDelegate, UINavigationControllerDelegate

      	// 实例化 UIImagePickerController 对象
      
      		let imagePickerController = UIImagePickerController()
      
      		// 设置代理
      imagePickerController.delegate = self // 设置是否需要做图片编辑,default NO.
      imagePickerController.allowsEditing = true // 判断数据来源是否可用
      if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.PhotoLibrary) { // 设置数据来源
      imagePickerController.sourceType = UIImagePickerControllerSourceType.PhotoLibrary // 打开相机/相册/图库
      self.presentViewController(imagePickerController, animated: true, completion: nil)
      } // UIImagePickerControllerDelegate 协议方法 // 取消选择
      func imagePickerControllerDidCancel(picker: UIImagePickerController) { // 退出当前界面
      picker.dismissViewControllerAnimated(true, completion: nil)
      } // 选择完成
      func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { let imageView = UIImageView(frame: CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20))
      self.view.addSubview(imageView) // 获取点击的图片
      imageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage picker.dismissViewControllerAnimated(true, completion: nil)
      }

2、imagePickerController 的设置

  • Objective-C

    	// 设置代理,需遵守 UIImagePickerControllerDelegate, UINavigationControllerDelegate 协议
    imagePickerController.delegate = self; // 设置是否需要做图片编辑
    imagePickerController.allowsEditing = YES; // 判断设备数据来源是否支持
    /*
    UIImagePickerControllerSourceTypePhotoLibrary, // 来自图库
    UIImagePickerControllerSourceTypeCamera, // 来自相机
    UIImagePickerControllerSourceTypeSavedPhotosAlbum // 来自相册
    */
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) { } // 判断摄像头是否支持
    /*
    UIImagePickerControllerCameraDeviceRear, // 后置摄像头
    UIImagePickerControllerCameraDeviceFront // 前置摄像头
    */
    if ([UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear]) { } // 判断闪光灯是否支持
    if ([UIImagePickerController isFlashAvailableForCameraDevice:UIImagePickerControllerCameraDeviceFront]) { } // 获取数据来源支持的媒体类型
    /*
    UIImagePickerControllerSourceTypePhotoLibrary, // 来自图库
    "public.image",
    "public.movie" UIImagePickerControllerSourceTypeCamera, // 来自相机
    ... UIImagePickerControllerSourceTypeSavedPhotosAlbum // 来自相册
    "public.image",
    "public.movie"
    */
    NSArray *mediaTypesArray = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeSavedPhotosAlbum]; // 获取相机拥有的模式
    /*
    UIImagePickerControllerCameraDeviceRear, // 后置摄像头
    ... UIImagePickerControllerCameraDeviceFront // 前置摄像头
    ...
    */
    NSArray *captureModesArray = [UIImagePickerController availableCaptureModesForCameraDevice:UIImagePickerControllerCameraDeviceFront]; // 设置数据来源
    /*
    UIImagePickerControllerSourceTypePhotoLibrary, // 来自图库,默认
    UIImagePickerControllerSourceTypeCamera, // 来自相机
    UIImagePickerControllerSourceTypeSavedPhotosAlbum // 来自相册
    */
    imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary; // 设置媒体类型
    /*
    kUTTypeImage 包含: kUTTypeImage; // 抽象的图片类型
    kUTTypeJPEG;
    kUTTypeJPEG2000;
    kUTTypeTIFF;
    kUTTypePICT;
    kUTTypeGIF;
    kUTTypePNG;
    kUTTypeQuickTimeImage;
    kUTTypeAppleICNS;
    kUTTypeBMP;
    kUTTypeICO kUTTypeMovie 包含: kUTTypeAudiovisualContent; // 抽象的声音视频
    kUTTypeMovie; // 抽象的媒体格式(声音和视频)
    kUTTypeVideo; // 只有视频没有声音
    kUTTypeAudio; // 只有声音没有视频
    kUTTypeQuickTimeMovie;
    kUTTypeMPEG;
    kUTTypeMPEG4;
    kUTTypeMP3;
    kUTTypeMPEG4Audio;
    kUTTypeAppleProtectedMPEG4Audio 需要 #import <MobileCoreServices/MobileCoreServices.h> 才能用 kUTTypeImage 和 KUTTypeMovie 。 default value is an array containing kUTTypeImage.
    */
    imagePickerController.mediaTypes = @[(NSString *)kUTTypeImage, (NSString *)kUTTypeMovie]; // 设置摄像头
    /*
    UIImagePickerControllerCameraDeviceRear, // 后置摄像头,默认
    UIImagePickerControllerCameraDeviceFront // 前置摄像头
    */
    imagePickerController.cameraDevice = UIImagePickerControllerCameraDeviceFront; // 设置相机模式
    /*
    UIImagePickerControllerCameraCaptureModePhoto, // 照相模式,默认
    UIImagePickerControllerCameraCaptureModeVideo // 录像模式
    */
    imagePickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto; // 设置闪光灯模式
    /*
    UIImagePickerControllerCameraFlashModeOff = -1, // 关
    UIImagePickerControllerCameraFlashModeAuto = 0, // 自动,默认
    UIImagePickerControllerCameraFlashModeOn = 1 // 开
    */
    imagePickerController.cameraFlashMode = UIImagePickerControllerCameraFlashModeOn; // 设置录像质量
    /*
    UIImagePickerControllerQualityTypeHigh = 0, // 高质量,highest quality
    UIImagePickerControllerQualityTypeMedium = 1, // 中质量,默认,Wi-Fi
    UIImagePickerControllerQualityTypeLow = 2, // 低质量,cellular network
    UIImagePickerControllerQualityType640x480 = 3, // VGA 质量,VGA quality UIImagePickerControllerQualityTypeIFrame1280x720 = 4,
    UIImagePickerControllerQualityTypeIFrame960x540 = 5 apply only if mediaTypes includes kUTTypeMovie
    */
    imagePickerController.videoQuality = UIImagePickerControllerQualityTypeHigh; // 设置录像时间长度
    /*
    default is 10 minutes. apply only mediaTypes includes kUTTypeMovie
    */
    imagePickerController.videoMaximumDuration = 600; // 设置是否显示相机原生 UI
    /*
    set to NO to hide all standard camera UI. default is YES. available sourceType is Camera.
    */
    imagePickerController.showsCameraControls = YES; // 自定义相机视图
    /*
    set a view to overlay the preview view. default is YES. available sourceType is Camera.
    */
    imagePickerController.cameraOverlayView = myView; // 改变相机视图
    /*
    set the transform of the preview view. default is YES. available sourceType is Camera. 旋转 45 度,需要输入的参数为弧度,45/180 * M_PI,1 度 = PI/180 弧度
    */
    imagePickerController.cameraViewTransform = CGAffineTransformMakeRotation(0.25 * M_PI); // 打开相机/相册/图库
    /*
    访问设置的数据来源界面
    */
    [self presentViewController:imagePickerController animated:YES completion:nil]; // 拍照
    /*
    拍摄照片
    */
    [imagePickerController takePicture]; // 录像 // 开始录像
    [imagePickerController startVideoCapture]; // 停止录像
    [imagePickerController stopVideoCapture]; // 退出当前界面(相机/相册/图库)
    /*
    在 UIImagePickerControllerDelegate 协议方法中调用
    */
    [picker dismissViewControllerAnimated:YES completion:nil]; // 获取选取媒体类型(图片或者视频)
    /*
    选取的信息都在 info 中,info 是一个字典。字典中的键: UIImagePickerControllerMediaType; // 指定用户选择的媒体类型,包含着 kUTTypeImage 和 kUTTypeMovie
    UIImagePickerControllerOriginalImage; // 原始图片
    UIImagePickerControllerEditedImage; // 修改后的图片,只有打开编辑模式 info 里才有此键值对
    UIImagePickerControllerCropRect; // 裁剪尺寸,只有打开编辑模式 info 里才有此键值对
    UIImagePickerControllerMediaURL; // 媒体的 URL
    UIImagePickerControllerReferenceURL; // 原件的 URL
    UIImagePickerControllerMediaMetadata // 当数据来源是照相机的时候这个值才有效 kUTTypeImage 包含: kUTTypeImage; // 抽象的图片类型
    kUTTypeJPEG;
    kUTTypeJPEG2000;
    kUTTypeTIFF;
    kUTTypePICT;
    kUTTypeGIF;
    kUTTypePNG;
    kUTTypeQuickTimeImage;
    kUTTypeAppleICNS;
    kUTTypeBMP;
    kUTTypeICO kUTTypeMovie 包含: kUTTypeAudiovisualContent; // 抽象的声音视频
    kUTTypeMovie; // 抽象的媒体格式(声音和视频)
    kUTTypeVideo; // 只有视频没有声音
    kUTTypeAudio; // 只有声音没有视频
    kUTTypeQuickTimeMovie;
    kUTTypeMPEG;
    kUTTypeMPEG4;
    kUTTypeMP3;
    kUTTypeMPEG4Audio;
    kUTTypeAppleProtectedMPEG4Audio 需要 #import <MobileCoreServices/MobileCoreServices.h> 才能用 kUTTypeImage 和 KUTTypeMovie 。
    */ // 直接处理点击的媒体资源 UIImageView *imageView = [[UIImageView alloc] initWithFrame:CGRectMake(0, 20, self.view.frame.size.width,
    self.view.frame.size.height - 20)];
    [self.view addSubview:imageView]; // 获取点击的图片
    imageView.image = [info objectForKey:UIImagePickerControllerOriginalImage]; // 先判断点击的资源类型再处理 // 判断点击的媒体资源类型
    if ([[info objectForKey:UIImagePickerControllerMediaType] isEqualToString:(NSString *)kUTTypeImage]) { UIImageView *headerImageView = [[UIImageView alloc] initWithFrame:CGRectMake(20, 40, 100, 100)];
    headerImageView.layer.borderColor = [[UIColor greenColor] CGColor];
    headerImageView.layer.borderWidth = 3;
    [self.view addSubview:headerImageView]; // 获取点击的图片
    headerImageView.image = [info objectForKey:UIImagePickerControllerEditedImage];
    }
  • Swift

      	// 设置代理,需遵守 UIImagePickerControllerDelegate, UINavigationControllerDelegate 协议
    imagePickerController.delegate = self // 设置是否需要做图片编辑
    imagePickerController.allowsEditing = true // 判断设备数据来源是否支持
    /*
    case PhotoLibrary // 来自图库
    case Camera // 来自相机
    case SavedPhotosAlbum // 来自相册
    */
    if UIImagePickerController.isSourceTypeAvailable(.PhotoLibrary) { } // 判断摄像头是否支持
    /*
    case Rear // 后置摄像头
    case Front // 前置摄像头
    */
    if UIImagePickerController.isCameraDeviceAvailable(.Rear) { } // 判断闪光灯是否支持
    if UIImagePickerController.isFlashAvailableForCameraDevice(.Front) { } // 获取数据来源支持的媒体类型
    /*
    PhotoLibrary, // 来自图库
    "public.image",
    "public.movie" Camera, // 来自相机
    ... SavedPhotosAlbum // 来自相册
    "public.image",
    "public.movie"
    */
    let mediaTypesArray = UIImagePickerController.availableMediaTypesForSourceType(.SavedPhotosAlbum) // 获取相机拥有的模式
    /*
    Rear, // 后置摄像头
    ... Front // 前置摄像头
    ...
    */
    let captureModesArray = UIImagePickerController.availableCaptureModesForCameraDevice(.Front) // 设置数据来源
    /*
    case PhotoLibrary // 来自图库
    case Camera // 来自相机
    case SavedPhotosAlbum // 来自相册
    */
    imagePickerController.sourceType = .PhotoLibrary // 设置媒体类型
    /*
    kUTTypeImage 包含:
    kUTTypeImage; // 抽象的图片类型
    kUTTypeJPEG;
    kUTTypeJPEG2000;
    kUTTypeTIFF;
    kUTTypePICT;
    kUTTypeGIF;
    kUTTypePNG;
    kUTTypeQuickTimeImage;
    kUTTypeAppleICNS;
    kUTTypeBMP;
    kUTTypeICO kUTTypeMovie 包含:
    kUTTypeAudiovisualContent; // 抽象的声音视频
    kUTTypeMovie; // 抽象的媒体格式(声音和视频)
    kUTTypeVideo; // 只有视频没有声音
    kUTTypeAudio; // 只有声音没有视频
    kUTTypeQuickTimeMovie;
    kUTTypeMPEG;
    kUTTypeMPEG4;
    kUTTypeMP3;
    kUTTypeMPEG4Audio;
    kUTTypeAppleProtectedMPEG4Audio 需要 import MobileCoreServices 才能用 kUTTypeImage 和 KUTTypeMovie 。 default value is an array containing kUTTypeImage.
    */
    imagePickerController.mediaTypes = [String(kUTTypeImage), String(kUTTypeMovie)] // 设置摄像头
    /*
    Rear, // 后置摄像头,默认
    Front // 前置摄像头
    */
    imagePickerController.cameraDevice = .Front // 设置相机模式
    /*
    Photo, // 照相模式,默认
    Video // 录像模式
    */
    imagePickerController.cameraCaptureMode = .Photo // 设置闪光灯模式
    /*
    Off = -1, // 关
    Auto = 0, // 自动,默认
    On = 1 // 开
    */
    imagePickerController.cameraFlashMode = .On // 设置录像质量
    /*
    TypeHigh = 0, // 高质量, highest quality
    TypeMedium = 1, // 中质量,默认, medium quality, Wi-Fi
    TypeLow = 2, // 低质量, lowest quality, cellular network
    Type640x480 = 3, // VGA 质量, VGA quality TypeIFrame1280x720 = 4,
    TypeIFrame960x540 = 5 apply only if mediaTypes includes kUTTypeMovie
    */
    imagePickerController.videoQuality = .TypeHigh // 设置录像时间长度
    /*
    default is 10 minutes. apply only mediaTypes includes kUTTypeMovie
    */
    imagePickerController.videoMaximumDuration = 600 // 设置是否显示相机原生 UI
    /*
    set to NO to hide all standard camera UI. default is YES. available sourceType is Camera.
    */
    imagePickerController.showsCameraControls = true // 自定义相机视图
    /*
    set a view to overlay the preview view. default is YES. available sourceType is Camera.
    */
    imagePickerController.cameraOverlayView = myView // 改变相机视图
    /*
    set the transform of the preview view. default is YES. available sourceType is Camera. 旋转 45 度,需要输入的参数为弧度,45/180 * M_PI,1 度 = PI/180 弧度
    */
    imagePickerController.cameraViewTransform = CGAffineTransformMakeRotation(0.25 * CGFloat(M_PI)) // 打开相机/相册/图库
    /*
    访问设置的数据来源界面
    */
    self.presentViewController(imagePickerController, animated: true, completion: nil) // 拍照
    /*
    拍摄照片
    */
    imagePickerController.takePicture() // 录像 // 开始录像
    imagePickerController.startVideoCapture() // 停止录像
    imagePickerController.stopVideoCapture() // 退出当前界面(相机/相册/图库)
    /*
    在 UIImagePickerControllerDelegate 协议方法中调用
    */
    picker.dismissViewControllerAnimated(true, completion: nil) // 获取选取媒体类型(图片或者视频)
    /*
    选取的信息都在 info 中,info 是一个字典。字典中的键: UIImagePickerControllerMediaType; // 指定用户选择的媒体类型,包含着 kUTTypeImage 和 kUTTypeMovie
    UIImagePickerControllerOriginalImage; // 原始图片
    UIImagePickerControllerEditedImage; // 修改后的图片,只有打开编辑模式 info 里才有此键值对
    UIImagePickerControllerCropRect; // 裁剪尺寸,只有打开编辑模式 info 里才有此键值对
    UIImagePickerControllerMediaURL; // 媒体的 URL
    UIImagePickerControllerReferenceURL; // 原件的 URL
    UIImagePickerControllerMediaMetadata // 当数据来源是照相机的时候这个值才有效 kUTTypeImage 包含:
    kUTTypeImage; // 抽象的图片类型
    kUTTypeJPEG;
    kUTTypeJPEG2000;
    kUTTypeTIFF;
    kUTTypePICT;
    kUTTypeGIF;
    kUTTypePNG;
    kUTTypeQuickTimeImage;
    kUTTypeAppleICNS;
    kUTTypeBMP;
    kUTTypeICO kUTTypeMovie 包含:
    kUTTypeAudiovisualContent; // 抽象的声音视频
    kUTTypeMovie; // 抽象的媒体格式(声音和视频)
    kUTTypeVideo; // 只有视频没有声音
    kUTTypeAudio; // 只有声音没有视频
    kUTTypeQuickTimeMovie;
    kUTTypeMPEG;
    kUTTypeMPEG4;
    kUTTypeMP3;
    kUTTypeMPEG4Audio;
    kUTTypeAppleProtectedMPEG4Audio 需要 import MobileCoreServices 才能用 kUTTypeImage 和 KUTTypeMovie 。
    */ // 直接处理点击的媒体资源 let imageView = UIImageView(frame: CGRectMake(0, 20, self.view.frame.size.width, self.view.frame.size.height - 20))
    self.view.addSubview(imageView) // 获取点击的图片
    imageView.image = info[UIImagePickerControllerOriginalImage] as? UIImage // 先判断点击的资源类型再处理 // 判断点击的媒体资源类型
    if (info[UIImagePickerControllerMediaType]?.isEqualToString(String(kUTTypeImage)) != nil) { let headerImageView = UIImageView(frame: CGRectMake(20, 40, 100, 100))
    headerImageView.layer.borderColor = UIColor.greenColor().CGColor
    headerImageView.layer.borderWidth = 3
    self.view.addSubview(headerImageView) // 获取点击的图片
    headerImageView.image = info[UIImagePickerControllerEditedImage] as? UIImage
    }

3、UIImagePickerControllerDelegate 协议方法

  • Objective-C

    	// 取消选择,点击界面中的取消(Cancel)按钮时触发
    - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker { } // 选择完成,点击界面中的某个图片或者选择(Choose)按钮时触发
    - (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info { }
  • Swift

    	// 取消选择,点击界面中的取消(Cancel)按钮时触发
    func imagePickerControllerDidCancel(picker: UIImagePickerController) { } // 选择完成,点击界面中的某个图片或者选择(Choose)按钮时触发
    func imagePickerController(picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : AnyObject]) { }

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