iOS - UIImagePickerController

前言

    NS_CLASS_AVAILABLE_IOS(2_0) @interface UIImagePickerController : UINavigationController 
    @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  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  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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