IOS获取图片有三种方式：
- UIImagePickerControllerSourceTypePhotoLibrary 相册
- UIImagePickerControllerSourceTypeCamera 相机
- UIImagePickerControllerSourceTypeSavedPhotosAlbum 图库
最好先判断设备数据来源是否支持
if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypePhotoLibrary]) {
}
步骤：
第一步：选择获取图片的方式
UIActionSheet *sheet = [[UIActionSheet alloc] initWithTitle:nil delegate:self cancelButtonTitle:@"取消" destructiveButtonTitle:nil otherButtonTitles:@"拍照",@"从相册选取", nil];
[sheet showInView:self.view];
第二部：创建UIImagePickerController
- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
NSUInteger sourceType = UIImagePickerControllerSourceTypeCamera;
switch (buttonIndex) {
case 0: //相机
sourceType = UIImagePickerControllerSourceTypeCamera;
break;
case 1: //相册
sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
break;
case 2: //取消
return;
break;
default:
break;
}
UIImagePickerController *imagePicker = [[UIImagePickerController alloc] init];
imagePicker.delegate = self;
imagePicker.sourceType = sourceType; //图片来源
imagePicker.showsCameraControls = YES;// 设置是否显示相机原生 UI 默认yes
imagePicker.allowsEditing = YES; //允许剪切图片
imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceFront; //前置摄像头
[self presentViewController:imagePicker animated:YES completion:nil];
}
第三步：两个delegate方法
确定使用相片
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary*)info {
[picker dismissViewControllerAnimated:YES completion:nil];
UIImage *image = [info objectForKey:UIImagePickerControllerEditedImage];//使用剪切后的图片
self.authenPhotoView.imageView.image = image;
}
取消
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
[picker dismissViewControllerAnimated:YES completion:nil];
}
知识补充：
1 - didFinishPickingMediaWithInfo 中的 info 可以选择使用的图片：
UIImagePickerControllerMediaType -- 指定用户选择的媒体类型（文章最后进行扩展）
UIImagePickerControllerOriginalImage -- 原始图片
UIImagePickerControllerEditedImage -- 修改后的图片
UIImagePickerControllerCropRect -- 裁剪尺寸
UIImagePickerControllerMediaURL -- 媒体的URL
UIImagePickerControllerReferenceURL -- 原件的URL
UIImagePickerControllerMediaMetadata;当来数据来源是照相机的时候这个值才有效
UIImage *image = [info objectForKey: UIImagePickerControllerEditedImage ];
2 - 摄像头 -> cameraDevice
UIImagePickerControllerCameraDeviceRear -- 后置摄像头
UIImagePickerControllerCameraDeviceFront -- 前置摄像头
可以判断摄像头是否支持
if ([UIImagePickerController isCameraDeviceAvailable: UIImagePickerControllerCameraDeviceRear]) {
}
3 - 设置相机的两种模式 -> cameraCaptureMode
UIImagePickerControllerCameraCaptureModePhoto -- 照相模式，默认
UIImagePickerControllerCameraCaptureModeVideo -- 录像模式
imagePickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto;
4 - 媒体类型 -> mediaTypes
需要 #import才能用 kUTTypeImage 和 KUTTypeMovie 。
UIImagePickerControllerMediaType 包含着KUTTypeImage 和KUTTypeMovie ；默认kUTTypeImage；
imagePickerController.mediaTypes = @[(NSString *)kUTTypeImage, (NSString *)kUTTypeMovie];
4.1 - kUTTypeImage 包含：
kUTTypeImage -- 抽象的图片类型
kUTTypeJPEG
kUTTypeJPEG2000
kUTTypeTIFF
kUTTypePICT
kUTTypeGIF
kUTTypePNG
kUTTypeQuickTimeImage
kUTTypeAppleICNS
kUTTypeBMP
kUTTypeICO
4.2 - kUTTypeMovie 包含：
kUTTypeAudiovisualContent -- 抽象的声音视频
kUTTypeMovie -- 抽象的媒体格式（声音和视频）
kUTTypeVideo -- 只有视频没有声音
kUTTypeAudio -- 只有声音没有视频
kUTTypeQuickTimeMovie
kUTTypeMPEG
kUTTypeMPEG4
kUTTypeMP3
kUTTypeMPEG4Audio
kUTTypeAppleProtectedMPEG4Audio
5 - 设置闪光灯模式 -> cameraFlashMode
UIImagePickerControllerCameraFlashModeOff = -1 // 关
UIImagePickerControllerCameraFlashModeAuto = 0 // 自动，默认
UIImagePickerControllerCameraFlashModeOn = 1 // 开
imagePickerController.cameraFlashMode = UIImagePickerControllerCameraFlashModeOn;
6 - 设置录像质量 -> videoQuality
UIImagePickerControllerQualityTypeHigh = 0 // 高质量，highest quality
UIImagePickerControllerQualityTypeMedium = 1 // 中质量，默认，Wi-Fi
UIImagePickerControllerQualityTypeLow = 2 // 低质量，cellular network
UIImagePickerControllerQualityType640x480 = 3 // VGA 质量，VGA quality
UIImagePickerControllerQualityTypeIFrame1280x720 = 4
UIImagePickerControllerQualityTypeIFrame960x540 = 5
imagePickerController.videoQuality = UIImagePickerControllerQualityTypeHigh;
7 - 录像
[imagePickerController startVideoCapture]; // 开始录像
[imagePickerController stopVideoCapture]; // 停止录像
imagePickerController.videoMaximumDuration = 600; // 设置录像时间长度 default is 10 minutes. apply only mediaTypes includes kUTTypeMovie
8 - 自定义相机视图
imagePickerController.showsCameraControls = YES; //设置是否显示相机原生 UI ；默认使用，为no时才可以自定义相机视图
imagePickerController.cameraOverlayView = myView; // 自定义相机视图
imagePickerController.cameraViewTransform = CGAffineTransformMakeRotation(0.25 * M_PI); //改变相机视图 - 旋转 45 度，需要输入的参数为弧度，45/180 * M_PI，1 度 ＝ PI/180 弧度;
参考：http://www.cnblogs.com/QianChia/p/5758377.html
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