使用UIImagePickerController获取本地相册、摄像头图片与视频-优快云博客

本文链接：https://blog.youkuaiyun.com/cheng_xiaocheng/article/details/48521081

本文详细介绍了如何使用UIImagePickerController组件在iOS应用中获取本地相册图片、摄像头图片与视频，并通过判断资源类型实现不同场景的图片与视频获取与处理，包括前置/后置摄像头的启用、视频媒体类型的指定以及最终通过didFinishPickingMediaWithInfo方法判断并处理选中按钮以执行相应操作。

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用UIImagePickerController创建一个对象,

//设置代理

imgPickerCtrl.delegate = self;

1.获取本地相册图片

    //设置资源类型
    imgPickerCtrl.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;
    //弹出模态

[self presentViewController:imgPickerCtrl animated:YES completion:nil];

点击”获取本地相册图片”,效果图:

//获取摄像头图片

判断摄像头的类型:前置/后置,有/无

BOOL isAvailable = [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];

    if (!isAvailable) {
        //如果没有摄像头,弹出框提示
        UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"提示" message:@"当前没有可用摄像头" delegate:nil cancelButtonTitle:@"确定" otherButtonTitles:nil, nil];
        [alertView show];

        return;
    }

//如果有,就启用摄像头拍照

imgPickerCtrl.sourceType = UIImagePickerControllerSourceTypeCamera;
[self presentViewController:imgPickerCtrl animated:YES completion:nil];

/**
* 获取本地视频

imgPickerCtrl.sourceType = UIImagePickerControllerSourceTypeSavedPhotosAlbum;

//指定媒体类型,比如public.movie

imgPickerCtrl.mediaTypes = @[@"public.movie"];

[self presentViewController:imgPickerCtrl animated:YES completion:nil];

/**
* 获取摄像头视频

    imgPickerCtrl.sourceType = UIImagePickerControllerSourceTypeCamera;

    //指定媒体类型
    imgPickerCtrl.mediaTypes = @[@"public.movie"];

    [self presentViewController:imgPickerCtrl animated:YES completion:nil];

通过 UIImagePickerController的选中方法didFinishPickingMediaWithInfo:判断选中的是那个按钮以做出相应操作;

//取得mediaType,判断是图片还是视频

NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];

//如果是图片

if ([mediaType isEqualToString:@"public.image"]) {

        //获取选中的图片
        UIImage *img = [info objectForKey:UIImagePickerControllerOriginalImage];
        _imgView.image = img;

        //如果是摄像头拍摄的则保存到本地
        if (picker.sourceType == UIImagePickerControllerSourceTypeCamera) {
            //将图片写到本地
            UIImageWriteToSavedPhotosAlbum(img, self, @selector(image:didFinishSavingWithError:contextInfo:), nil);
        }

    }else if ([mediaType isEqualToString:@"public.movie"]){//视频
        //获取视图的url
        NSURL *url = [info objectForKey:UIImagePickerControllerReferenceURL];

        //播放器播放(还没学)
    }

    //关闭当前的模态视图
    [self dismissViewControllerAnimated:YES completion:nil];

保存摄像头图片后还可以用 didFinishSavingWithError:方法进行操作,比如用弹出框提示@“保存成功"