Question

我使用以下代码从IPAD前置摄像头自动拍摄照片：

UIImagePickerController *imgPkr = [[UIImagePickerController alloc] init];
        imgPkr.sourceType = UIImagePickerControllerSourceTypeCamera;
        imgPkr.delegate = self;

        imgPkr.cameraDevice=UIImagePickerControllerCameraDeviceFront;
        [self presentModalViewController:imgPkr animated:YES];
        imgPkr.showsCameraControls = NO;
        [imgPkr takePicture];

但是这段代码不要拍任何照片，也不要给代表打电话：

    -(void)imagePickerController:(UIImagePickerController*)picker
didFinishPickingMediaWithInfo:(NSDictionary*)info

知道代码有什么问题

Answer 1

我的第一个猜测是在呈现选择器之前调用了[imgPkr takePicture];。试试这样：

UIImagePickerController *imgPkr = [[UIImagePickerController alloc] init];
        imgPkr.sourceType = UIImagePickerControllerSourceTypeCamera;
        imgPkr.delegate = self;

        imgPkr.cameraDevice=UIImagePickerControllerCameraDeviceFront;
        [self presentModalViewController:imgPkr animated:YES];
        imgPkr.showsCameraControls = NO;
        [self performSelector:@selector(takePicture) withObject:self afterDelay:1.0];

OR

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(takePicture)
                                             name:AVCaptureSessionDidStartRunningNotification 

object:nil];

＆安培;

- (void)takePicture
{
    [imgPkr takePicture];
}

Answer 2

我打赌你在日志中收到一条消息说

UIImagePickerController：忽略拍照请求;相机是尚未准备好。

这是一个常见问题，因为底层捕获会话需要一些时间才能启动，因此您必须确保相机已准备好拍照并然后调用takePicture方法。现在，我在这里的答案中详细解释了获得通知的方法：How to know if iPhone camera is ready to take picture? 请注意，此方法适用于iOS5 +（旧版本中存在一个错误，可防止此事件的系统通知，与文档中描述的相反）。我希望这会有所帮助。

Answer 3

等待相机准备好的另一种方法，直到拍照完成块 - ＆gt;

[self presentViewController:imagePicker animated:YES
                 completion:^ {
                     [imagePicker takePicture];
                 }];

谢谢你'GrandSteph'来 iOS taking photo programmatically

UIImagePickerController委托没有调用

3 个答案: