类型
UIImagePickerControllerSourceTypePhotoLibrary 相册 视频
UIImagePickerControllerSourceTypeCamera 拍照 摄像
UIImagePickerControllerSourceTypeSavedPhotosAlbum 时刻

媒体类型
public.movie 视频，拍摄
public.image 相册，拍照

• 相册，拍照

#import "ViewController.h"

@interface ViewController () <UIImagePickerControllerDelegate, UINavigationControllerDelegate>

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


@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    
    
}

/** 相册 */
- (IBAction)photo:(id)sender {
    
    // 相册的来源访问UIImagePickerController
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    
    /*
     UIImagePickerControllerSourceTypePhotoLibrary 相册
     UIImagePickerControllerSourceTypeCamera 拍照 摄像
     UIImagePickerControllerSourceTypeSavedPhotosAlbum 时刻
     */
    //数据源类型
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    
    // 是否允许编辑
    picker.allowsEditing = YES;
    
    picker.delegate = self;
    
    [self presentViewController:picker animated:YES completion:nil];
}

/** 拍照 */
- (IBAction)photograph:(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) {
        
        UIImagePickerController *imagePickerC = [[UIImagePickerController alloc]init];
        //数据源的类型
        imagePickerC.sourceType = UIImagePickerControllerSourceTypeCamera;
        
        imagePickerC.delegate = self;
        
        [self presentViewController:imagePickerC animated:YES completion:nil];
        
    }
    
    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];

}

    
//照片保存成功的回调方法  注意:方法名命名有要求
// 存储图片
- (void)image:(UIImage *)image didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo {
    
    if (error) {
        [SVProgressHUD showErrorWithStatus:@"保存失败!"];
    } else {
        [SVProgressHUD showSuccessWithStatus:@"保存成功!"];
    }
    
}
@end

• 视频， 拍摄

/** 视频 */
- (IBAction)video:(id)sender {
    
    // 相册的来源访问UIImagePickerController
    UIImagePickerController *picker = [[UIImagePickerController alloc] init];
    
    //数据源类型
    picker.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    
    picker.delegate = self;
    
    //指定媒体类型 (默认public.image )
    picker.mediaTypes = @[@"public.movie"];//public.image
    
    [self presentViewController:picker animated:YES completion:nil];
    
}

/** 拍摄 */
- (IBAction)shoot:(id)sender {
    
    //判断是否有摄像头
    BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
    
    if (isCamera) {
        
        // 相册的来源访问UIImagePickerController
        UIImagePickerController *picker = [[UIImagePickerController alloc] init];
        
        //数据源类型
        picker.sourceType = UIImagePickerControllerSourceTypeCamera;
        
        picker.delegate = self;
        
        //指定媒体类型 (默认public.image )
        picker.mediaTypes = @[@"public.movie"];//public.image
        
        [self presentViewController:picker animated:YES completion:nil];
        
    }
    
    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];
    
}

• 代理 UIImagePickerControllerDelegate

#pragma mark - UIImagePickerControllerDelegate
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)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
         */
        self.photoImageView.image = info[@"UIImagePickerControllerEditedImage"];
        
        //如果是照相
        if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
            
            //保存到相册中
            UIImageWriteToSavedPhotosAlbum(info[@"UIImagePickerControllerOriginalImage"], self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
            
        }
        
        [picker dismissViewControllerAnimated:YES completion:nil];
        
    } else if ([mediaType isEqualToString:@"public.movie"]) {// 视频
        
        NSURL *url = info[UIImagePickerControllerMediaURL];
        
        // 播放
        
    }
    
}