在闪光模式下拍照后iPhone相机延迟

Question

在闪光模式下拍照后iPhone相机延迟,我使用UIImagePicker控制器并用于takePicture拍摄照片,除了闪光模式开启外,它在所有模式下都能正常工作.当它打开时需要一些时间来处理图像.为什么会发生这种情况.任何人都可以帮助我.我的代码如下.

拍照我用过

[picker takePicture];

用户拍照后......

imagePickerController:didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    [picker dismissModelviewControllerAnimated:YES];
}

Answer 1

我发现在任何情况下处理图片都需要一段时间.在我的didFinishPickingMediaWithInfo中,我在主视图顶部加载一个视图,告诉用户我正在处理图像.

-(void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    UIImage *picture = [info valueForKey:UIImagePickerControllerOriginalImage];
    [self dismissModalViewControllerAnimated:YES];
    [self performSelectorInBackground:@selector(processImage:) withObject:picture];

    _activityView = [[PSActivityView alloc] initWithFrame:CGRectZero];
    _activityView.text = NSLocalizedString(@"Processing...", nil);

    [self.view addSubview:_activityView];
    [self.view bringSubviewToFront:_activityView];
}

PSActivityView类在layoutSubViews方法中自行调整大小,processImage方法处理图像并在完成后解析_activityView.

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