相机、相册的使用

• 注：本文只展示相机、相册的基本用法

//遵循代理
<UIImagePickerControllerDelegate, UINavigationControllerDelegate>


//设置变量
UIImagePickerController *_imagePickerController;//调取系统相机、相册


#pragma mark - 相机、相册相关
//创建_imagePickerController
- (void) createImagePickerController {
    if (!_imagePickerController) {
        _imagePickerController = [[UIImagePickerController alloc] init];
        _imagePickerController.delegate = self;
        _imagePickerController.modalTransitionStyle = UIModalTransitionStyleCoverVertical;
        _imagePickerController.mediaTypes = @[(NSString *)kUTTypeMovie];//图片是：kUTTypeImage
        _imagePickerController.allowsEditing = YES;
    }
}
//从摄像头获取视频（或图片）
- (void)selectImageFromCamera
{
    _imagePickerController.sourceType = UIImagePickerControllerSourceTypeCamera;

    //下面是video需要设置的属性
    _imagePickerController.videoMaximumDuration = 30;//录制视频时长，默认10s
    _imagePickerController.videoQuality = UIImagePickerControllerQualityTypeMedium;//视频上传质量
    _imagePickerController.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;//设置摄像头模式（拍照，录制视频）为录像模式

    [self presentViewController:_imagePickerController animated:YES completion:nil];
}
//从相册获取视频（或图片）
- (void)selectImageFromAlbum
{
    _imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentViewController:_imagePickerController animated:YES completion:nil];
}
//获取资源成功代理方法（适用获取所有媒体资源，只需判断资源类型）
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    NSString *mediaType=[info objectForKey:UIImagePickerControllerMediaType];
    //判断资源类型
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]){
        //如果是图片
        UIImage * image = info[UIImagePickerControllerEditedImage];
        //压缩图片
        NSData *fileData = UIImageJPEGRepresentation(image, 1.0);
        //上传图片
        //[self uploadImageWithData:fileData];
    }else{
        //如果是视频
        NSURL *url = info[UIImagePickerControllerMediaURL];
        NSData *videoData = [NSData dataWithContentsOfURL:url];
        //视频上传
        //[self uploadVideoWithData:videoData];
    }
    [self dismissViewControllerAnimated:YES completion:nil];
}
//“取消”操作代理方法
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [self dismissViewControllerAnimated:YES completion:nil];
}

参考文章：
https://www.jianshu.com/p/e70a184d1f32