iOS使用UIImagePickerController调用系统相机，相册和图库

UIImagePickerController是系统打包的导航视图控制器，其开发人员可以轻松调用与相册相关的功能. UIImagePickerController继承自UINavigationController，它将用户获得的图片或视频文件通过代理传递给开发人员.

在使用UIImagePickerController之前ios调用相机和相册，您应该首先确定设备支持的媒体文件的类型. 使用以下方法确定:

//判断是否支持某个数据提供类型
/*
UIImagePickerControllerSourceType枚举定义如下:
typedef NS_ENUM(NSInteger, UIImagePickerControllerSourceType) {
    //系统图库
    UIImagePickerControllerSourceTypePhotoLibrary,
    //相机
    UIImagePickerControllerSourceTypeCamera,
    //系统相册
    UIImagePickerControllerSourceTypeSavedPhotosAlbum
} __TVOS_PROHIBITED;
*/
+ (BOOL)isSourceTypeAvailable:(UIImagePickerControllerSourceType)sourceType;
//判断某个数据提供者所支持的文件格式
/*
文件格式定义在<MobileCoreServices/MobileCoreServices.h>框架中
*/
+ (nullable NSArray<NSString *> *)availableMediaTypesForSourceType:(UIImagePickerControllerSourceType)sourceType; 
//判断所支持的相机设备
/*
typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraDevice) {
    //前置
    UIImagePickerControllerCameraDeviceRear,
    //后置
    UIImagePickerControllerCameraDeviceFront
} __TVOS_PROHIBITED;
*/
+ (BOOL)isCameraDeviceAvailable:(UIImagePickerControllerCameraDevice)cameraDevice                   NS_AVAILABLE_IOS(4_0); 
//判断对闪光灯的支持
+ (BOOL)isFlashAvailableForCameraDevice:(UIImagePickerControllerCameraDevice)cameraDevice           NS_AVAILABLE_IOS(4_0);
//判断相机设备支持的媒体模式
/*
返回值为如下枚举：
typedef NS_ENUM(NSInteger, UIImagePickerControllerCameraCaptureMode) {
    //照片模式
    UIImagePickerControllerCameraCaptureModePhoto,
    //视频模式
    UIImagePickerControllerCameraCaptureModeVideo
} __TVOS_PROHIBITED;
*/
+ (nullable NSArray<NSNumber *> *)availableCaptureModesForCameraDevice:(UIImagePickerControllerCameraDevice)cameraDevice NS_AVAILABLE_IOS(4_0); 

下面列出了在框架中定义的文件类型:

//图片类型
extern const CFStringRef kUTTypeImage                                __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
//JPEG格式
extern const CFStringRef kUTTypeJPEG                                 __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
//JPEG2000格式
extern const CFStringRef kUTTypeJPEG2000                             __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeTIFF                                 __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypePICT                                 __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeGIF                                  __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypePNG                                  __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeQuickTimeImage                       __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeAppleICNS                            __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeBMP                                  __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeICO                                  __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeRawImage                             __OSX_AVAILABLE_STARTING(__MAC_10_10,__IPHONE_8_0);
extern const CFStringRef kUTTypeScalableVectorGraphics               __OSX_AVAILABLE_STARTING(__MAC_10_10,__IPHONE_8_0);
extern const CFStringRef kUTTypeLivePhoto                            __OSX_AVAILABLE_STARTING(__MAC_NA,__IPHONE_9_1);
//视频格式
extern const CFStringRef kUTTypeAudiovisualContent                   __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeMovie                                __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeVideo                                __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeAudio                                __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeQuickTimeMovie                       __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeMPEG                                 __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeMPEG2Video                           __OSX_AVAILABLE_STARTING(__MAC_10_10,__IPHONE_8_0);
extern const CFStringRef kUTTypeMPEG2TransportStream                 __OSX_AVAILABLE_STARTING(__MAC_10_10,__IPHONE_8_0);
extern const CFStringRef kUTTypeMP3                                  __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeMPEG4                                __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeMPEG4Audio                           __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeAppleProtectedMPEG4Audio             __OSX_AVAILABLE_STARTING(__MAC_10_4,__IPHONE_3_0);
extern const CFStringRef kUTTypeAppleProtectedMPEG4Video             __OSX_AVAILABLE_STARTING(__MAC_10_10,__IPHONE_8_0);
extern const CFStringRef kUTTypeAVIMovie                             __OSX_AVAILABLE_STARTING(__MAC_10_10,__IPHONE_8_0);
extern const CFStringRef kUTTypeAudioInterchangeFileFormat           __OSX_AVAILABLE_STARTING(__MAC_10_10,__IPHONE_8_0);
extern const CFStringRef kUTTypeWaveformAudio                        __OSX_AVAILABLE_STARTING(__MAC_10_10,__IPHONE_8_0);
extern const CFStringRef kUTTypeMIDIAudio                            __OSX_AVAILABLE_STARTING(__MAC_10_10,__IPHONE_8_0);

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