1、导入框架#import ->UIImagePickerController
2、先区分选择摄像头、相册sourceType
（1）UIImagePickerControllerSourceTypePhotoLibrary摄像头
（2）UIImagePickerControllerSourceTypeCamera相册
（3）UIImagePickerControllerSourceTypeSavedPhotosAlbum相册
3、再区分录像与拍照cameraCaptureMode:
（0）设置录像->要先选择媒体的类型默认拍照不崩溃因为默认设置媒体类型是kUTTypeImage※※※※※※不然会崩溃
（1）录像:UIImagePickerControllerCameraCaptureModeVideo
（2）拍照:UIImagePickerControllerCameraCaptureModePhoto
4、区分前后摄像头cameraDevice
（1）UIImagePickerControllerCameraDeviceRear前摄像头
（2）UIImagePickerControllerCameraDeviceFront后摄像头
5、选择媒体类型mediaTypes
（1）选择媒体类型默认kUTTypeImage
（2）kUTTypeImage包含在框架->#import
（3）需要的内容不是OC里面的字符串类型需要强制转换
（4）录制视频->类型要选择kUTTypeMovie它里面包含了audio和vidio
6、设置是否显示控制控件showsCameraControls
7、设置拍照takePicture
8、录像startVideoCapture、stopVideoCapture
9、设置视频清晰度videoQu
（1）UIImagePickerControllerQualityTypeHigh
（2）UIImagePickerControllerQualityTypeMedium
（3）UIImagePickerControllerQualityTypeLow
（4）UIImagePickerControllerQualityType640x480
（5）UIImagePickerControllerQualityTypeIFrame1280x720
（6）UIImagePickerControllerQualityTypeIFrame960x540
10、设置视频最大的录像时间videoMaximumDuration
11、设置闪光cameraFlashMode
（1）UIImagePickerControllerCameraFlashModeOff关闭
（2）UIImagePickerControllerCameraFlashModeAuto自动-默认
（3）UIImagePickerControllerCameraFlashModeOn开启
12、设置调用摄像头视频页面的覆盖视图cameraOverlayView
13、设置拍照页面的形态cameraViewTransform
14、代理delegate需要导入两个代理
方法：
- (void)imagePickerController:(UIImagePickerController *)picker
didFinishPickingMediaWithInfo:(NSDictionary *)info;采集完成之后调用、不区分摄像拍照
- (void)imagePickerControllerDidCancel:(UIImagePickerController
*)picker;采集取消的时候调用
15、（1）把图片保存到相册
UIImageWriteToSavedPhotosAlbum(finishImage,
self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
（2）保存成功的回调方法
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error
contextInfo:(void *)contextInfo{
NSLog(@"图片保存成功");
}
16、（1）保存视频到相册
NSString *path = (NSString *)[info[UIImagePickerControllerMediaURL] path];
UISaveVideoAtPathToSavedPhotosAlbum(path,
self, @selector(video:didFinishSavingWithError:contextInfo:), nil);
（2）视频保存到相册之后调用
- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error
contextInfo:(void *)contextInfo{
}
17、（1）JPEG格式图片转换成NSData
NSData *imageData = UIImageJPEGRepresentation(finishImage, 0.1);
（2）PNG格式图片转换成NSData
NSData *imageData1 = UIImagePNGRepresentation(finishImage);
