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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