Question

所以我将用户的图像上传到我的服务器。一旦用户选择UIImagePickerController中的图像：

，我就会有以下代码

    public void Picked(object sender, UIImagePickerMediaPickedEventArgs e)
    {
        Console.WriteLine ("done picking");
        picker.DismissViewController (false, null);

        image.Image = e.Info [UIImagePickerController.OriginalImage] as UIImage;


        UploadImage (); //call the upload function
    }

除非我希望在UploadImage();通话之前解除选择器，但是在上传完成之后它才被解雇，这是有效的。

如何在选择图像后立即取消选择器视图？

Answer 1

我建议您通过dispatchAsync运行UploadImage，如下所示：

   public void Picked(object sender, UIImagePickerMediaPickedEventArgs e)
    {
        Console.WriteLine ("done picking");
        picker.DismissViewController (false, null);

        image.Image = e.Info [UIImagePickerController.OriginalImage] as UIImage;

        yourQueue = new DispatchQueue ("Image Uploading Queue");
        yourQueue.DispatchAsync (() => {

             UploadImage (); //call the upload function
        });
    }

您的用户界面可以更新。

Answer 2

尝试将uploadImage放在GCD中。

这样的事情：

picker.DismissViewController (false, null);
image.Image = e.Info [UIImagePickerController.OriginalImage] as UIImage;

dispatch_queue_t concurrentQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0); 

dispatch_async(concurrentQueue, ^{

    uploadImage();
});

Answer 3

对于要更新的视图，我从新线程调用了UplodImage()

Thread t = new Thread (UploadImage);
t.Start ();

上传前关闭图片选取器

3 个答案: