iOS 视频开发自己写 UIImagePickerController

UIImagePickerController是苹果给的轻便型多媒体控件，完成选择图片视频拍照拍视频的功能。

步骤

步骤1 定义

self.pickerController = [[UIImagePickerController alloc] init];

步骤2 设备校验

- (BOOL) isFrontCameraAvailable{
    return [UIImagePickerController
            isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront];
}
- (BOOL) isRearCameraAvailable{
    return [UIImagePickerController
            isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
}
- (BOOL) isPhotoLibrarySourceTypeAvailable{
    return [UIImagePickerController
            isSourceTypeAvailable: UIImagePickerControllerSourceTypePhotoLibrary];
}
- (BOOL) isCameraSourceTypeAvailable{
    return [UIImagePickerController
            isSourceTypeAvailable: UIImagePickerControllerSourceTypeCamera];
}
- (BOOL) isSavedPhotosAlbumSourceTypeAvailable{
    return [UIImagePickerController
            isSourceTypeAvailable: UIImagePickerControllerSourceTypeSavedPhotosAlbum];
}
- (BOOL) isFrontCameraFlashAvailable{
    return [UIImagePickerController
            isFlashAvailableForCameraDevice:UIImagePickerControllerCameraDeviceFront];
}
- (BOOL) isRearCameraFlashAvailable{
    return [UIImagePickerController
            isFlashAvailableForCameraDevice:UIImagePickerControllerCameraDeviceRear];
}

step3 配置

    self.pickerController.sourceType = UIImagePickerControllerSourceTypeCamera;
    self.pickerController.cameraDevice = UIImagePickerControllerCameraDeviceRear;
    self.pickerController.mediaTypes = @[(NSString*)kUTTypeMovie];
    self.pickerController.videoQuality = UIImagePickerControllerQualityTypeHigh;
    self.pickerController.cameraFlashMode = UIApplicationShortcutIconTypeCaptureVideo;
    self.pickerController.allowsEditing = YES;
    self.pickerController.delegate = self;

step4 实现代理

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(nonnull NSDictionary<UIImagePickerControllerInfoKey,id> *)info
{
    NSLog([info description]);
    NSString * mediaType = [info objectForKey:UIImagePickerControllerMediaType];
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) { //如果是拍照
        UIImage * image;
        //如果允许编辑则获得编辑后的照片，否则获取原始照片
        if (_pickerController.allowsEditing) {
            image = [info objectForKey:UIImagePickerControllerEditedImage];//获取编辑后的照片
        } else {
            image = [info objectForKey:UIImagePickerControllerOriginalImage];//获取原始照片
        }
        
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);//保存到相簿
        
    }
    else if([mediaType isEqualToString:(NSString *)kUTTypeMovie]){ //如果是录制视频
        NSURL * url = [info objectForKey:UIImagePickerControllerMediaURL];
        NSString * urlStr = [url path];
        if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(urlStr)) {
            //保存视频到相簿，注意也可以使用ALAssetsLibrary来保存
            UISaveVideoAtPathToSavedPhotosAlbum(urlStr, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);
        }
    }
    
    [self dismissViewControllerAnimated:YES completion:nil];
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker
{
    [self dismissViewControllerAnimated:YES completion:nil];
}

API说明

枚举类型

typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
    UIImagePickerControllerSourceTypePhotoLibrary,  // 图片库
    UIImagePickerControllerSourceTypeCamera,   // 摄像头
    UIImagePickerControllerSourceTypeSavedPhotosAlbum //相机照片
} __TVOS_PROHIBITED;

typedef NS_ENUM(NSInteger, UIImagePickerControllerQualityType) {
    UIImagePickerControllerQualityTypeHigh = 0,       // highest quality
    UIImagePickerControllerQualityTypeMedium = 1,     // medium quality, suitable for transmission via Wi-Fi 
    UIImagePickerControllerQualityTypeLow = 2,         // lowest quality, suitable for tranmission via cellular network
    UIImagePickerControllerQualityType640x480 NS_ENUM_AVAILABLE_IOS(4_0) = 3,    // VGA quality
    UIImagePickerControllerQualityTypeIFrame1280x720 NS_ENUM_AVAILABLE_IOS(5_0) = 4,
    UIImagePickerControllerQualityTypeIFrame960x540 NS_ENUM_AVAILABLE_IOS(5_0) = 5,
} __TVOS_PROHIBITED;

typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraCaptureMode) {
    UIImagePickerControllerCameraCaptureModePhoto,
    UIImagePickerControllerCameraCaptureModeVideo
} __TVOS_PROHIBITED;

typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraDevice) {
    UIImagePickerControllerCameraDeviceRear,
    UIImagePickerControllerCameraDeviceFront
} __TVOS_PROHIBITED;

闪光灯
typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraFlashMode) {
    UIImagePickerControllerCameraFlashModeOff  = -1,
    UIImagePickerControllerCameraFlashModeAuto = 0,
    UIImagePickerControllerCameraFlashModeOn   = 1
} __TVOS_PROHIBITED;

苹果在 iOS 11 的发布会上，推出了两种新的媒体格式 HEIF HEVC
都是为了保证画质的情况下，大大减少视频、照片的大小。
安卓能否打开？
typedef NS_ENUM(NSInteger, UIImagePickerControllerImageURLExportPreset) {
    UIImagePickerControllerImageURLExportPresetCompatible = 0,
    UIImagePickerControllerImageURLExportPresetCurrent
} NS_AVAILABLE_IOS(11_0) __TVOS_PROHIBITED;

info dictionary

typedef NSString * UIImagePickerControllerInfoKey NS_TYPED_ENUM;

// info dictionary keys
UIKIT_EXTERN UIImagePickerControllerInfoKey const UIImagePickerControllerMediaType __TVOS_PROHIBITED;      // an NSString (UTI, i.e. kUTTypeImage)
UIKIT_EXTERN UIImagePickerControllerInfoKey const UIImagePickerControllerOriginalImage __TVOS_PROHIBITED;  // a UIImage
UIKIT_EXTERN UIImagePickerControllerInfoKey const UIImagePickerControllerEditedImage __TVOS_PROHIBITED;    // a UIImage
UIKIT_EXTERN UIImagePickerControllerInfoKey const UIImagePickerControllerCropRect __TVOS_PROHIBITED;       // an NSValue (CGRect)
UIKIT_EXTERN UIImagePickerControllerInfoKey const UIImagePickerControllerMediaURL __TVOS_PROHIBITED;       // an NSURL
UIKIT_EXTERN UIImagePickerControllerInfoKey const UIImagePickerControllerReferenceURL        NS_DEPRECATED_IOS(4_1, 11_0, "Replace with public API: UIImagePickerControllerPHAsset") __TVOS_PROHIBITED;  // an NSURL that references an asset in the AssetsLibrary framework
UIKIT_EXTERN UIImagePickerControllerInfoKey const UIImagePickerControllerMediaMetadata       NS_AVAILABLE_IOS(4_1) __TVOS_PROHIBITED;  // an NSDictionary containing metadata from a captured photo
UIKIT_EXTERN UIImagePickerControllerInfoKey const UIImagePickerControllerLivePhoto NS_AVAILABLE_IOS(9_1) __TVOS_PROHIBITED;  // a PHLivePhoto
UIKIT_EXTERN UIImagePickerControllerInfoKey const UIImagePickerControllerPHAsset NS_AVAILABLE_IOS(11_0) __TVOS_PROHIBITED;  // a PHAsset
UIKIT_EXTERN UIImagePickerControllerInfoKey const UIImagePickerControllerImageURL NS_AVAILABLE_IOS(11_0) __TVOS_PROHIBITED;  // an NSURL

function


+ (BOOL)isSourceTypeAvailable:(UIImagePickerControllerSourceType)sourceType;               
//判断设备是否支持指定sourceType
// returns YES if source is available (i.e. camera present)

+ (nullable NSArray<NSString *> *)availableMediaTypesForSourceType:(UIImagePickerControllerSourceType)sourceType; 
//返回设备支持的sourceType列表
// returns array of available media types (i.e. kUTTypeImage)

+ (BOOL)isCameraDeviceAvailable:(UIImagePickerControllerCameraDevice)cameraDevice                   NS_AVAILABLE_IOS(4_0);
//是否支持camera
// returns YES if camera device is available 

+ (BOOL)isFlashAvailableForCameraDevice:(UIImagePickerControllerCameraDevice)cameraDevice           NS_AVAILABLE_IOS(4_0); 
//是否支持闪光灯
// returns YES if camera device supports flash and torch.

+ (nullable NSArray<NSNumber *> *)availableCaptureModesForCameraDevice:(UIImagePickerControllerCameraDevice)cameraDevice NS_AVAILABLE_IOS(4_0);
//返回支持的设备类型列表
 // returns array of NSNumbers (UIImagePickerControllerCameraCaptureMode)

变量

UIImagePickerControllerSourceType     sourceType;                                                        // default value is UIImagePickerControllerSourceTypePhotoLibrary.
NSArray<NSString *>                   *mediaTypes;
    // default value is an array containing kUTTypeImage.
BOOL                                  allowsEditing NS_AVAILABLE_IOS(3_1);     // replacement for -allowsImageEditing; default value is NO.
UIImagePickerControllerImageURLExportPreset imageExportPreset NS_AVAILABLE_IOS(11_0);   // default value is UIImagePickerControllerImageExportPresetCompatible.

// video properties apply only if mediaTypes includes kUTTypeMovie
NSTimeInterval                        videoMaximumDuration NS_AVAILABLE_IOS(3_1); // default value is 10 minutes.
UIImagePickerControllerQualityType    videoQuality NS_AVAILABLE_IOS(3_1);         // default value is UIImagePickerControllerQualityTypeMedium. If the cameraDevice does not support the videoQuality, it will use the default value.
NSString                              *videoExportPreset NS_AVAILABLE_IOS(11_0);  // videoExportPreset can be used to specify the transcoding quality for videos (via a AVAssetExportPreset* string). If the value is nil (the default) then the transcodeQuality is determined by videoQuality instead. Not valid if the source type is UIImagePickerControllerSourceTypeCamera


// camera additions available only if sourceType is UIImagePickerControllerSourceTypeCamera.
BOOL                                  showsCameraControls NS_AVAILABLE_IOS(3_1);   // set to NO to hide all standard camera UI. default is YES
 __kindof UIView                *cameraOverlayView  NS_AVAILABLE_IOS(3_1);   // set a view to overlay the preview view.
CGAffineTransform                     cameraViewTransform NS_AVAILABLE_IOS(3_1);   // set the transform of the preview view.

UIImagePickerControllerCameraCaptureMode cameraCaptureMode NS_AVAILABLE_IOS(4_0); // default is UIImagePickerControllerCameraCaptureModePhoto
 UIImagePickerControllerCameraDevice      cameraDevice      NS_AVAILABLE_IOS(4_0); // default is UIImagePickerControllerCameraDeviceRear
UIImagePickerControllerCameraFlashMode   cameraFlashMode   NS_AVAILABLE_IOS(4_0); // default is UIImagePickerControllerCameraFlashModeAuto. 
// cameraFlashMode controls the still-image flash when cameraCaptureMode is Photo. cameraFlashMode controls the video torch when cameraCaptureMode is Video.

function

- (void)takePicture NS_AVAILABLE_IOS(3_1);                                                   
// programatically initiates still image capture. ignored if image capture is in-flight.
// clients can initiate additional captures after receiving -imagePickerController:didFinishPickingMediaWithInfo: delegate callback

- (BOOL)startVideoCapture NS_AVAILABLE_IOS(4_0);
- (void)stopVideoCapture  NS_AVAILABLE_IOS(4_0);

delegate

// The picker does not dismiss itself; the client dismisses it in these callbacks.用户需要自己去关闭
// The delegate will receive one or the other, but not both, depending whether the user
//操作完毕
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<UIImagePickerControllerInfoKey, id> *)info;
//操作取消
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;

UIKIT_EXTERN函数，经过处理的extern



// Adds a photo to the saved photos album.  The optional completionSelector should have the form:
//  - (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo;
UIKIT_EXTERN void UIImageWriteToSavedPhotosAlbum(UIImage *image, __nullable id completionTarget, __nullable SEL completionSelector, void * __nullable contextInfo) __TVOS_PROHIBITED;

// Is a specific video eligible to be saved to the saved photos album? 
UIKIT_EXTERN BOOL UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(NSString *videoPath) NS_AVAILABLE_IOS(3_1) __TVOS_PROHIBITED;

// Adds a video to the saved photos album. The optional completionSelector should have the form:
//  - (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo;
UIKIT_EXTERN void UISaveVideoAtPathToSavedPhotosAlbum(NSString *videoPath, __nullable id completionTarget, __nullable SEL completionSelector, void * __nullable contextInfo) NS_AVAILABLE_IOS(3_1) __TVOS_PROHIBITED;

**NS_AVAILABLE_IOS(5_0) **
这个方法可以在iOS5.0及以后的版本中使用，如果在比5.0更老的版本中调用这个方法，就会引起崩溃。
NS_DEPRECATED_IOS(2_0, 6_0)
这个宏中有两个版本号。前面一个表明了这个方法被引入时的iOS版本，后面一个表明它被废弃时的iOS版本。被废弃并不是指这个方法就不存在了，只是意味着我们应当开始考虑将相关代码迁移到新的API上去了。

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