IOS UIImagePickerController从拍照、图库、相册获取图片

enum {

  UIImagePickerControllerSourceTypePhotoLibrary ,//来自图库

  UIImagePickerControllerSourceTypeCamera ,//来自相机

  UIImagePickerControllerSourceTypeSavedPhotosAlbum //来自相册

};

 if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera])

  {

    NSLog(@"支持相机");

  }

  if([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary])

  {

    NSLog(@"支持图库");

  }

  if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeSavedPhotosAlbum])

  {

    NSLog(@"支持相片库");

  }

- (void)viewDidLoad {

  [super viewDidLoad];

  picker = [[UIImagePickerController alloc]init];

  picker.view.backgroundColor = [UIColor orangeColor];

  UIImagePickerControllerSourceType sourcheType = UIImagePickerControllerSourceTypeCamera;

  picker.sourceType = sourcheType;

  picker.delegate = self;

  picker.allowsEditing = YES;

}

[self presentViewController:picker animated:YES completion:nil];

UIImagePickerControllerDelegate

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary

 *)info;

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;

- (void)imagePickerController:(UIImagePickerController *)picker

 didFinishPickingMediaWithInfo:(NSDictionary *)info;

NSString *const UIImagePickerControllerMediaType ;指定用户选择的媒体类型（文章最后进行扩展）

NSString *const UIImagePickerControllerOriginalImage ;原始图片

NSString *const UIImagePickerControllerEditedImage ;修改后的图片

NSString *const UIImagePickerControllerCropRect ;裁剪尺寸

NSString *const UIImagePickerControllerMediaURL ;媒体的URL

NSString *const UIImagePickerControllerReferenceURL ;原件的URL

NSString *const UIImagePickerControllerMediaMetadata;当来数据来源是照相机的时候这个值才有效

const CFStringRef kUTTypeImage ;抽象的图片类型

const CFStringRef kUTTypeJPEG ;

const CFStringRef kUTTypeJPEG2000 ;

const CFStringRef kUTTypeTIFF ;

const CFStringRef kUTTypePICT ;

const CFStringRef kUTTypeGIF ;

const CFStringRef kUTTypePNG ;

const CFStringRef kUTTypeQuickTimeImage ;

const CFStringRef kUTTypeAppleICNS 

const CFStringRef kUTTypeBMP;

const CFStringRef kUTTypeICO;

const CFStringRef kUTTypeAudiovisualContent ;抽象的声音视频

const CFStringRef kUTTypeMovie ;抽象的媒体格式（声音和视频）

const CFStringRef kUTTypeVideo ;只有视频没有声音

const CFStringRef kUTTypeAudio ;只有声音没有视频

const CFStringRef kUTTypeQuickTimeMovie ;

const CFStringRef kUTTypeMPEG ;

const CFStringRef kUTTypeMPEG4 ;

const CFStringRef kUTTypeMP3 ;

const CFStringRef kUTTypeMPEG4Audio ;

const CFStringRef kUTTypeAppleProtectedMPEG4Audio;