iOS系统拍照功能使用

调用系统相机和麦克风进行视频录制，并限制录制时长。

1、权限配置

相机权限 Privacy - Camera Usage Description App想要访问您手机的系统相机，是否允许？
麦克风权限 Privacy - Microphone Usage Description App想要访问您手机的麦克风，是否允许？

录制音视频需要以上权限

2、引入头文件

#import

里面定义了kUTTypeImage、kUTTypeMovie等，不引入会报错。

3、打开系统相机录制视频的方法

- (void)openCamera {
    UIImagePickerController *pickerCon = [[UIImagePickerController alloc]init];
    pickerCon.sourceType = UIImagePickerControllerSourceTypeCamera;
    pickerCon.mediaTypes = @[(NSString *)kUTTypeMovie];//设定相机为视频
    pickerCon.cameraDevice = UIImagePickerControllerCameraDeviceRear;//设置相机后摄像头
    pickerCon.videoMaximumDuration = 10;//最长拍摄时间
    pickerCon.videoQuality = UIImagePickerControllerQualityTypeHigh;//拍摄质量
    pickerCon.allowsEditing = NO;
    pickerCon.delegate = self;
    [self presentViewController:pickerCon animated:YES completion:nil];
}

3、回调

#pragma mark - UIImagePickerControllerDelegate
//selected
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    //此处需要先dismiss掉picker，然后再present出alert，佛否则alert显示会出bug
    [picker dismissViewControllerAnimated:YES completion:nil];
    
    if (picker.sourceType == UIImagePickerControllerSourceTypeCamera)
    {
        NSString *mediaType = [info objectForKey:UIImagePickerControllerMediaType];
        //如果是拍照
        if ([mediaType isEqualToString:(NSString *)kUTTypeImage]) {
            
        }
        //如果是录制视频
        else if([mediaType isEqualToString:(NSString *)kUTTypeMovie]) {
            NSLog(@"*******info*******%@",info);
            NSURL *url = [info objectForKey:UIImagePickerControllerMediaURL];
            NSString *videoPath = url.path;
            //保存到相册
            if (UIVideoAtPathIsCompatibleWithSavedPhotosAlbum(videoPath)) {
                NSLog(@"保存成功");
            } else {
                NSLog(@"保存失败");
            }
        }
    }
}
//cancel
- (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
    [picker dismissViewControllerAnimated:YES completion:nil];
}