UIImagePickerController

数据源类型

UIImagePickerControllerSourceTypePhotoLibrary 相 册
UIImagePickerControllerSourceTypeCamera 拍照 摄像
UIImagePickerControllerSourceTypeSavedPhotosAlbum 时刻

媒体类型

mediaTypes:
public.image//是图片类型
public.movie//是视频类型

相册，照相

//相册
- (IBAction)selectImage:(id)sender {
    
    //相册的资源访问UIImagePickerController来读取
    UIImagePickerController *imagePickerC = [[UIImagePickerController alloc]init];
    
    //数据源类型
    imagePickerC.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;//相册
    //是否允许编辑
    imagePickerC.allowsEditing = YES;
    
    imagePickerC.delegate = self;
    
    [self presentViewController:imagePickerC animated:YES completion:NULL];
    
}
//照相
- (IBAction)takePhoto:(id)sender {
    
    /*
     UIImagePickerControllerCameraDeviceRear:后置摄像头
     UIImagePickerControllerCameraDeviceFront:前置摄像头
     */
    //判断是否有摄像头
    BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
    
    if (!isCamera) {
        
        UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"没有可用的摄像头" message:nil preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            
        }];
        [alertC addAction:action];
        
        [self presentViewController:alertC animated:YES completion:NULL];
        return;
    }
    
     UIImagePickerController *imagePickerC = [[UIImagePickerController alloc]init];
    //数据源的类型
    imagePickerC.sourceType = UIImagePickerControllerSourceTypeCamera;
    
    imagePickerC.delegate = self;
    
    imagePickerC.allowsEditing = YES;
    
    [self presentViewController:imagePickerC animated:YES completion:NULL];   
}

视频，拍摄

//视频
- (IBAction)video:(id)sender {

    UIImagePickerController *imagePickerC = [[UIImagePickerController alloc]init];

    imagePickerC.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;
    
    imagePickerC.delegate = self;
    
    //指定媒体类型 (默认public.image )
    imagePickerC.mediaTypes = @[@"public.movie"];//public.image
    
    [self presentViewController:imagePickerC animated:YES completion:NULL];
    

}
//拍摄
- (IBAction)shoot:(id)sender {
    //判断是否有摄像头
    BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
    
    if (!isCamera) {
        
        UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"没有可用的摄像头" message:nil preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *action = [UIAlertAction actionWithTitle:@"确定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            
        }];
        [alertC addAction:action];
        
        [self presentViewController:alertC animated:YES completion:NULL];
        
        return;
    }

    
    
    UIImagePickerController *imagePickerC = [[UIImagePickerController alloc]init];
    
    //数据流类型:拍摄
    imagePickerC.sourceType =UIImagePickerControllerSourceTypeCamera;
    
    imagePickerC.delegate = self;
    
    //指定媒体类型 (默认public.image )
    imagePickerC.mediaTypes = @[@"public.movie"];//public.image
    
    [self presentViewController:imagePickerC animated:YES completion:NULL];
}

UIImagePickerController代理方法

#pragma mark - UIImagePickerController Delegate
//完成选择之后
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    
    NSLog(@"info = %@",info);
    
    //获取媒体类型
    NSString *mediaType = info[UIImagePickerControllerMediaType];
    
    if ([mediaType isEqualToString:@"public.image"]) { //照片
        
        /*
         UIImagePickerControllerEditedImage:编辑后的图片
         UIImagePickerControllerOriginalImage:编辑前的图片
         */
        UIImage *img = info[UIImagePickerControllerEditedImage];
        
        self.myImageView.image = img;
        
        //如果是照相
        if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
            
            //保存到相册中
            UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
            
            
        }
        
        
        [picker dismissViewControllerAnimated:YES completion:NULL];
        
    }else if ([mediaType isEqualToString:@"public.movie"]){ //视频
    
        NSURL *url = info[UIImagePickerControllerMediaURL];
        
        //播放视频 MPMoviePlayerViewController需要引入框架
        MPMoviePlayerViewController *moviePlayer = [[MPMoviePlayerViewController alloc]initWithContentURL:url];
        //弹出视频播放器,自动播放
        [picker presentViewController:moviePlayer animated:YES completion:NULL];
        
        
        
    }
    
   
    
    
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{

    NSLog(@"取消选择");
    
    [self dismissViewControllerAnimated:YES completion:NULL];
    
}

//照片保存成功的回调方法  注意:方法名命名有要求
- (void)               image: (UIImage *) image
    didFinishSavingWithError: (NSError *) error
                 contextInfo: (void *) contextInfo{

    NSLog(@"保存成功");
}

注意：
照相，拍摄是需要摄像头的，因为模拟器没有摄像头，所以需要用真机模拟。