ios 摄像头应用+相册

本文介绍一些关于摄像头和相册的基本用法，在调用摄像头之前，不要忘记检测摄像头是否可用；
首先导入系统文件

#import <AVFoundation/AVFoundation.h>

调用系统摄像头、相册，遵循代理：

<UIImagePickerControllerDelegate,UINavigationControllerDelegate>

检测摄像头可用性，代码如下：

#pragma mark - 摄像头可用性检测
// 判断摄像头是否可用
- (BOOL) ifCameraAvailable{
    return [UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera];
}
// 前置摄像头是否可用
- (BOOL) ifFrontCameraAvailable{
    return [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceFront];
}

// 后置摄像头是否可用
- (BOOL) ifRearCameraAvailable{
    return [UIImagePickerController isCameraDeviceAvailable:UIImagePickerControllerCameraDeviceRear];
}
#pragma mark - 调用摄像头
//判别是否有2个摄像头
- (BOOL) hasMultipleCameras {
    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    if (devices != nil && [devices count] > 1) return YES;
    return NO;
}
//获取相应位置的摄像头焦点
- (AVCaptureDevice *)cameraWithPosition:(AVCaptureDevicePosition) position
{
    NSArray *devices = [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo];
    for (AVCaptureDevice *device in devices )
        if ( device.position == position )
            return device;
    return nil ;
}

调用摄像头代码：

//启用摄像头拍照
-(void)startUsingCamera{
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        UIImagePickerController *pickerCtl = [[UIImagePickerController alloc]init];
        pickerCtl.delegate = self;
        pickerCtl.allowsEditing = YES;
        pickerCtl.sourceType = UIImagePickerControllerSourceTypeCamera;
        [self presentViewController:pickerCtl animated:YES completion:nil];
    }
}
//启用摄像头录像
-(void)startUsingCameraForVideo1{
    if ([UIImagePickerController isSourceTypeAvailable:UIImagePickerControllerSourceTypeCamera]) {
        UIImagePickerController *pickerCtl = [[UIImagePickerController alloc]init];
        pickerCtl.delegate = self;
        pickerCtl.allowsEditing = YES;
        pickerCtl.sourceType = UIImagePickerControllerSourceTypeCamera;
        pickerCtl.cameraDevice = UIImagePickerControllerCameraDeviceFront;//设置使用哪个摄像头,此处设置前置
        pickerCtl.mediaTypes = [UIImagePickerController availableMediaTypesForSourceType:UIImagePickerControllerSourceTypeCamera];
        pickerCtl.videoQuality = UIImagePickerControllerQualityTypeIFrame1280x720;
        pickerCtl.cameraCaptureMode = UIImagePickerControllerCameraCaptureModeVideo;//设置摄像头使用模式（拍照、录像）
        
        [self presentViewController:pickerCtl animated:YES completion:nil];
    }else{
        NSLog(@"摄像头不可用！");
    }
}
//视频保存后的回调
- (void)saveVideo:(NSString *)videoPath didFinishSavingWithError:(NSError *)error contextInfo:(void *)contextInfo{
    if (error) {
        NSLog(@"保存视频过程中发生错误，错误信息:%@",error.localizedDescription);
    }else{
        NSLog(@"视频保存成功.");
        //录制完之后自动播放
        NSURL *url=[NSURL fileURLWithPath:videoPath];
        AVPlayer *player=[AVPlayer playerWithURL:url];//@property (strong ,nonatomic) AVPlayer *player;//播放器，用于录制完视频后播放视频
        AVPlayerLayer *playerLayer=[AVPlayerLayer playerLayerWithPlayer:player];
        UIImageView *videoPlayer = [[UIImageView alloc] initWithFrame:CGRectMake(20, 50, self.view.frame.size.width - 40, 100)];//该区域请自行调整
        [self.view addSubview:videoPlayer];
        
        playerLayer.frame = videoPlayer.frame;
        [videoPlayer.layer addSublayer:playerLayer];
        [player play];
        
    }
}

/**  ------------ 分割线 ------------  */
#pragma mark - UIImagePickerControllerDelegate
//完成时
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{

    NSString *mediaType=[info objectForKey:UIImagePickerControllerMediaType];
    if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {//如果是拍照
        UIImage *image;
        //如果允许编辑则获得编辑后的照片，否则获取原始照片
        /*
        if (picker.allowsEditing) {
            image=[info objectForKey:UIImagePickerControllerEditedImage];//获取编辑后的照片
        }else{
            
        }
         */
        image=[info objectForKey:UIImagePickerControllerOriginalImage];//获取原始照片
//        [self.photo setImage:image];//photo是UIImageView 显示照片
        UIImageWriteToSavedPhotosAlbum(image, nil, nil, nil);//保存到相簿
    }else if([mediaType isEqualToString:(NSString *)kUTTypeMovie]){//如果是录制视频
        NSLog(@"video...");
        NSURL *url=[info objectForKey:UIImagePickerControllerMediaURL];//视频路径
        //NSData *data = [NSData dataWithContentsOfURL:url];//转化视频为NSData用于上传

        NSString *urlStr=[url path];
        if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(urlStr)) {
            //保存视频到相簿，注意也可以使用ALAssetsLibrary来保存
            UISaveVideoAtPathToSavedPhotosAlbum(urlStr, self, @selector(saveVideo:didFinishSavingWithError:contextInfo:), nil);//保存视频到相簿
        }
        //如果录制的视频需要上传服务器在此进行操作
    }

    [self dismissViewControllerAnimated:YES completion:nil];
}

调用相册代码：

//启用相册
-(void)startUsingAlbum{
    UIImagePickerController *pickerCtl = [[UIImagePickerController alloc]init];
    pickerCtl.delegate = self;
    pickerCtl.allowsEditing = YES;
    pickerCtl.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
    [self presentViewController:pickerCtl animated:YES completion:nil];
}

由于所取图片尺寸大小不一，所以需要对图片进行相应处理，代码如下：

/** 压缩图片 */
-(UIImage *)thumbnaiWithImage:(UIImage *)image size:(CGSize)size{
    UIImage *newImage = nil;
    if (image != nil) {
        //获取 要开始绘制的图片（尺寸大小）的上下文
        UIGraphicsBeginImageContext(size);
        //绘制size大小的图片
        [image drawInRect:CGRectMake(0, 0, size.width, size.height)];
        //从现在绘制的图片 的上下文中 获取绘制好的图片
        newImage = UIGraphicsGetImageFromCurrentImageContext();
        //关闭 绘制图片的上下文
        UIGraphicsEndImageContext();
    }
    return newImage;
}
/** 对imageView进行图片压缩，并给Imv赋值 */
-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary<NSString *,id> *)info{
    //获取 原始图片
    UIImage *originalImage = info[UIImagePickerControllerOriginalImage];
    //进行图片压缩，尺寸
    UIImage *compressImage = [self thumbnaiWithImage:originalImage size:CGSizeMake(170, 170)];
    //将压缩的图片 转化为 NSData，以便上传 头像信息,缩小为0.1倍
    NSData *imageData = UIImageJPEGRepresentation(compressImage, 0.1);
    
    /** 将图片转化为base64的字符串，存到数据库中或者plist文件中 */
    //将图片(NSData类型)转换为Base64的字符串
    NSString *image64 = [imageData base64EncodedStringWithOptions:NSDataBase64Encoding64CharacterLineLength];//该base64码用工具是不能直接转换出图片的，要加上请求头data:image/png;base64,

    /**   注意！
      *   如果需要上传更新图片，在此处进行相应操作
     */

   /** 给headImv.image赋值 */
    self.headImv.image = [UIImage imageWithData:imageData];
  //如果要缓存图片，可用NSUserDefault对imageData（二进制数据）进行缓存，注意直接缓存image是崩溃的！

    [self dismissViewControllerAnimated:YES completion:nil];
}

另注：将英文提示转成中文提示，方法如下；
在 Info.plist 中
Localization native development region 设为 China

语言设置截图.png

最后要在info.plist中添加授权，如下

Privacy - Camera Usage Description//摄像头
Privacy - Photo Library Usage Description//相册
Privacy - Microphone Usage Description//视频录制需用麦克风

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