使用UIImagePickerController拍照和视频录制

转载自:http://blog.csdn.net/jueyi1127/article/details/46831875

一 UIImagePickerController简介和属性介绍。

UIImagePickerController继承于UINavigationController。UIImagePickerController可以用来选择照片，它还可以用来拍照和录制视频。首先看一下这个类常用的属性和方法：

属性	说明
@property(nonatomic)           UIImagePickerControllerSourceType     sourceType	拾取源类型，sourceType是枚举类型： UIImagePickerControllerSourceTypePhotoLibrary：照片库 ，默认值 UIImagePickerControllerSourceTypeCamera：摄像头 UIImagePickerControllerSourceTypeSavedPhotosAlbum：相簿
@property(nonatomic,copy)      NSArray                              *mediaTypes	媒体类型,默认情况下此数组包含kUTTypeImage，所以拍照时可以不用设置；但是当要录像的时候必须设置，可以设置为kUTTypeVideo（视频，但不带声音）或者kUTTypeMovie（视频并带有声音）
@property(nonatomic)           NSTimeInterval                        videoMaximumDuration	视频最大录制时长，默认为10 s
@property(nonatomic)           UIImagePickerControllerQualityType    videoQuality	视频质量，枚举类型： UIImagePickerControllerQualityTypeHigh：高清质量 UIImagePickerControllerQualityTypeMedium：中等质量，适合WiFi传输 UIImagePickerControllerQualityTypeLow：低质量，适合蜂窝网传输 UIImagePickerControllerQualityType640x480：640*480 UIImagePickerControllerQualityTypeIFrame1280x720：1280*720 UIImagePickerControllerQualityTypeIFrame960x540：960*540
@property(nonatomic)           BOOL                                  showsCameraControls	是否显示摄像头控制面板，默认为YES
@property(nonatomic,retain)    UIView                                *cameraOverlayView	摄像头上覆盖的视图，可用通过这个视频来自定义拍照或录像界面
@property(nonatomic)           CGAffineTransform                     cameraViewTransform	摄像头形变
@property(nonatomic) UIImagePickerControllerCameraCaptureMode cameraCaptureMode	摄像头捕获模式， 4000 捕获模式是枚举类型： UIImagePickerControllerCameraCaptureModePhoto：拍照模式 UIImagePickerControllerCameraCaptureModeVideo：视频录制模式
@property(nonatomic) UIImagePickerControllerCameraDevice      cameraDevice	摄像头设备，cameraDevice是枚举类型： UIImagePickerControllerCameraDeviceRear：前置摄像头 UIImagePickerControllerCameraDeviceFront：后置摄像头
@property(nonatomic) UIImagePickerControllerCameraFlashMode   cameraFlashMode	闪光灯模式，枚举类型： UIImagePickerControllerCameraFlashModeOff：关闭闪光灯 UIImagePickerControllerCameraFlashModeAuto：闪光灯自动 UIImagePickerControllerCameraFlashModeOn：打开闪光灯
类方法	说明
+ (BOOL)isSourceTypeAvailable:(UIImagePickerControllerSourceType)sourceType	指定的源类型是否可用，sourceType是枚举类型： UIImagePickerControllerSourceTypePhotoLibrary：照片库 UIImagePickerControllerSourceTypeCamera：摄像头 UIImagePickerControllerSourceTypeSavedPhotosAlbum：相簿
+ (NSArray *)availableMediaTypesForSourceType:(UIImagePickerControllerSourceType)sourceType	指定的源设备上可用的媒体类型，一般就是图片和视频
+ (BOOL)isCameraDeviceAvailable:(UIImagePickerControllerCameraDevice)cameraDevice	指定的摄像头是否可用，cameraDevice是枚举类型： UIImagePickerControllerCameraDeviceRear：前置摄像头 UIImagePickerControllerCameraDeviceFront：后置摄像头
+ (BOOL)isFlashAvailableForCameraDevice:(UIImagePickerControllerCameraDevice)cameraDevice	指定摄像头的闪光灯是否可用
+ (NSArray *)availableCaptureModesForCameraDevice:(UIImagePickerControllerCameraDevice)cameraDevice	获得指定摄像头上的可用捕获模式，捕获模式是枚举类型： UIImagePickerControllerCameraCaptureModePhoto：拍照模式 UIImagePickerControllerCameraCaptureModeVideo：视频录制模式
对象方法	说明
- (void)takePicture	编程方式拍照
- (BOOL)startVideoCapture	编程方式录制视频
- (void)stopVideoCapture	编程方式停止录制视频
代理方法	说明
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info	媒体拾取完成
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker	取消拾取
扩展方法（主要用于保存照片、视频到相簿）	说明
UIImageWriteToSavedPhotosAlbum(UIImage *image, id completionTarget, SEL completionSelector, void *contextInfo)	保存照片到相簿
UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(NSString *videoPath)	能否将视频保存到相簿
void UISaveVideoAtPathToSavedPhotosAlbum(NSString *videoPath, id completionTarget, SEL completionSelector, void *contextInfo)	保存视频到相簿

二 使用UIImagePickerController拍照和视频录制

[objc] view
plain copy

#import "ViewController.h"  

#import <MobileCoreServices/MobileCoreServices.h>  

#import <AVFoundation/AVFoundation.h>  

  

@interface ViewController ()<UIImagePickerControllerDelegate,UINavigationControllerDelegate>  

  

@property (weak, nonatomic) IBOutlet UIImageView *mImageview;  

  

@property (nonatomic,assign) BOOL isTakeVedio;  

  

@property (nonatomic,strong) UIImagePickerController *imagePicker;  

@property (nonatomic,strong) AVPlayer *player;  

  

@end  

  

@implementation ViewController  

  

- (void)viewDidLoad {  

    [super viewDidLoad];  

    // Do any additional setup after loading the view, typically from a nib.  

}  

  

- (void)didReceiveMemoryWarning {  

    [super didReceiveMemoryWarning];  

    // Dispose of any resources that can be recreated.  

}  

  

- (IBAction)takePic:(id)sender {  

    _isTakeVedio = NO;  

    [self showPicker];  

}  

  

- (IBAction)takeVedio:(id)sender {  

    _isTakeVedio = YES;  

    [self showPicker];  

}  

  

  

  

- (UIImagePickerController *)imagePicker  

{  

    if (_imagePicker == nil) {  

        _imagePicker = [[UIImagePickerController alloc] init];  

        _imagePicker.sourceType = UIImagePickerControllerSourceTypeCamera;    //设置来源为摄像头  

        _imagePicker.cameraDevice = UIImagePickerControllerCameraDeviceRear; //设置使用的摄像头为：后置摄像头  

        if (self.isTakeVedio) {  

            _imagePicker.mediaTypes = @[(NSString *)kUTTypeVideo];    //设置为视频模式-<span style="color: rgb(51, 51, 51); font-family: Georgia, 'Times New Roman', Times, sans-serif; font-size: 14px; line-height: 25px;">注意媒体类型定义在MobileCoreServices.framework中</span>  

            _imagePicker.videoQuality = UIImagePickerControllerQualityTypeIFrame1280x720;   //设置视频质量  

            _imagePicker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;  //设置摄像头模式为录制视频  

        }  

        else{  

            _imagePicker.cameraCaptureMode = UIImagePickerControllerCameraCaptureModePhoto; //设置摄像头模式为拍照  

        }  

    }  

    return _imagePicker;  

}  

  

- (void)showPicker  

{  

    [self presentViewController:self.imagePicker animated:YES completion:nil];  

}  

  

#pragma mark-  

#pragma mark - UIImagePickerControllerDelegate  

  

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

{  

    NSString *type = [info objectForKey:UIImagePickerControllerMediaType];  

    if ([type isEqualToString:(NSString *)kUTTypeImage]) {  

        //图片保存和展示  

        UIImage *image;  

        if (picker.allowsEditing) {  

            image = [info objectForKey:UIImagePickerControllerEditedImage]; //允许编辑，获取编辑过的图片  

        }  

        else{  

            image = [info objectForKey:UIImagePickerControllerOriginalImage]; //不允许编辑，获取原图片  

        }  

        self.mImageview.image = image;  

        UIImageWriteToSavedPhotosAlbum(image,nil,nil, nil);  

    }  

    else if([type isEqualToString:(NSString *)kUTTypeVideo]){  

        //视频保存后 播放视频  

        NSURL *url = [info objectForKey:UIImagePickerControllerMediaURL];  

        NSString *urlPath = [url path];  

        if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(urlPath)) {  

            UISaveVideoAtPathToSavedPhotosAlbum(urlPath, self, @selector(video:didFinishSavingWithError:contextInfo:), nil);  

        }  

    }  

      

}  

  

- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker  

{  

      

}  

  

#pragma mark-  

#pragma mark - share method  

  

//视频保存后的回调  

- (void)video:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(voidvoid *)contextInfo{  

    if (error) {  

        NSLog(@"保存视频过程中发生错误，错误信息:%@",error.localizedDescription);  

    }else{  

        NSLog(@"视频保存成功.");  

        //录制完之后自动播放  

        NSURL *url=[NSURL fileURLWithPath:videoPath];  

        _player=[AVPlayer playerWithURL:url];  

        AVPlayerLayer *playerLayer=[AVPlayerLayer playerLayerWithPlayer:_player];  

        playerLayer.frame = self.mImageview.frame;  

        [self.mImageview.layer addSublayer:playerLayer];  

        [_player play];  

    }  

}