IOS UIImagePickerController从拍照、图库、相册获取图片
iOS 获取图片有三种方法:
1. 直接调用摄像头拍照
2. 从相册中选择
3. 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:
1. 初始化UIImagePickerController 类;
2. 设置UIImagePickerController 实例的数据来源类型(下面解释);
3. 设置设置代理;
4. 如果需要做图片修改的话设置allowsEditing =yes。
数据来源类型一共有三种:
enum { UIImagePickerControllerSourceTypePhotoLibrary ,//来自图库 UIImagePickerControllerSourceTypeCamera ,//来自相机 UIImagePickerControllerSourceTypeSavedPhotosAlbum //来自相册 };
在用这些来源的时候最好检测以下设备是否支持;
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"); }
调用摄像头来获取资源
- (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; }
上面只是实例了UIImagePickerController及其属性 在需要获取图片的时候需要弹出窗口调用
[self presentViewController:picker animated:YES completion:nil];
我们还需要代理来获取我们选中的图片
UIImagePickerControllerDelegate
代理中一共三个方法 其中一个3.0 已经废弃了,只剩下两个我们需要用的
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info;
当用户选取完成后调用;
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker;
当用户取消选取时调用;
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info;
选取的信息都在info中,info 是一个字典。
字典中的键:
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
UIImagePickerControllerMediaType 包含着KUTTypeImage 和KUTTypeMovie
KUTTypeImage 包含:
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;
KUTTypeMovie 包含:
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;
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