UIImagePickerController

資料來源型別

UIImagePickerControllerSourceTypePhotoLibrary 相 冊
UIImagePickerControllerSourceTypeCamera 拍照 攝像
UIImagePickerControllerSourceTypeSavedPhotosAlbum 時刻

媒體型別

mediaTypes:
public.image//是圖片型別
public.movie//是視訊型別

相簿，照相

//相簿
- (IBAction)selectImage:(id)sender {
    
    //相簿的資源訪問UIImagePickerController來讀取
    UIImagePickerController *imagePickerC = [[UIImagePickerController alloc]init];
    
    //資料來源型別
    imagePickerC.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;//相簿
    //是否允許編輯
    imagePickerC.allowsEditing = YES;
    
    imagePickerC.delegate = self;
    
    [self presentViewController:imagePickerC animated:YES completion:NULL];
    
}
//照相
- (IBAction)takePhoto:(id)sender {
    
    /*
     UIImagePickerControllerCameraDeviceRear:後置攝像頭
     UIImagePickerControllerCameraDeviceFront:前置攝像頭
     */
    //判斷是否有攝像頭
    BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
    
    if (!isCamera) {
        
        UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"沒有可用的攝像頭" message:nil preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *action = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            
        }];
        [alertC addAction:action];
        
        [self presentViewController:alertC animated:YES completion:NULL];
        return;
    }
    
     UIImagePickerController *imagePickerC = [[UIImagePickerController alloc]init];
    //資料來源的型別
    imagePickerC.sourceType = UIImagePickerControllerSourceTypeCamera;
    
    imagePickerC.delegate = self;
    
    imagePickerC.allowsEditing = YES;
    
    [self presentViewController:imagePickerC animated:YES completion:NULL];   
}

視訊，拍攝

//視訊
- (IBAction)video:(id)sender {

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

    imagePickerC.sourceType =UIImagePickerControllerSourceTypePhotoLibrary;
    
    imagePickerC.delegate = self;
    
    //指定媒體型別 (預設public.image )
    imagePickerC.mediaTypes = @[@"public.movie"];//public.image
    
    [self presentViewController:imagePickerC animated:YES completion:NULL];
    

}
//拍攝
- (IBAction)shoot:(id)sender {
    //判斷是否有攝像頭
    BOOL isCamera = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
    
    if (!isCamera) {
        
        UIAlertController *alertC = [UIAlertController alertControllerWithTitle:@"沒有可用的攝像頭" message:nil preferredStyle:UIAlertControllerStyleAlert];
        UIAlertAction *action = [UIAlertAction actionWithTitle:@"確定" style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action) {
            
        }];
        [alertC addAction:action];
        
        [self presentViewController:alertC animated:YES completion:NULL];
        
        return;
    }

    
    
    UIImagePickerController *imagePickerC = [[UIImagePickerController alloc]init];
    
    //資料流型別:拍攝
    imagePickerC.sourceType =UIImagePickerControllerSourceTypeCamera;
    
    imagePickerC.delegate = self;
    
    //指定媒體型別 (預設public.image )
    imagePickerC.mediaTypes = @[@"public.movie"];//public.image
    
    [self presentViewController:imagePickerC animated:YES completion:NULL];
}

UIImagePickerController代理方法

#pragma mark - UIImagePickerController Delegate
//完成選擇之後
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    
    NSLog(@"info = %@",info);
    
    //獲取媒體型別
    NSString *mediaType = info[UIImagePickerControllerMediaType];
    
    if ([mediaType isEqualToString:@"public.image"]) { //照片
        
        /*
         UIImagePickerControllerEditedImage:編輯後的圖片
         UIImagePickerControllerOriginalImage:編輯前的圖片
         */
        UIImage *img = info[UIImagePickerControllerEditedImage];
        
        self.myImageView.image = img;
        
        //如果是照相
        if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
            
            //儲存到相簿中
            UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
            
            
        }
        
        
        [picker dismissViewControllerAnimated:YES completion:NULL];
        
    }else if ([mediaType isEqualToString:@"public.movie"]){ //視訊
    
        NSURL *url = info[UIImagePickerControllerMediaURL];
        
        //播放視訊 MPMoviePlayerViewController需要引入框架
        MPMoviePlayerViewController *moviePlayer = [[MPMoviePlayerViewController alloc]initWithContentURL:url];
        //彈出視訊播放器,自動播放
        [picker presentViewController:moviePlayer animated:YES completion:NULL];
        
        
        
    }
    
   
    
    
}
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker{

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

//照片儲存成功的回撥方法  注意:方法名命名有要求
- (void)               image: (UIImage *) image
    didFinishSavingWithError: (NSError *) error
                 contextInfo: (void *) contextInfo{

    NSLog(@"儲存成功");
}

注意：
照相，拍攝是需要攝像頭的，因為模擬器沒有攝像頭，所以需要用真機模擬。