如何从iOS照片库中获取图像并将其显示在UIWebView中 [英] How do I get an image from the iOS photo library and display it in UIWebView

问题描述

我见过许多使用 UIImage 输出图像的例子。我希望输出设置为 UIWebView ，因为我想在图像周围添加一些额外的HTML格式。

I've seen a lot of examples where you use the UIImage for outputting an image. I would like the output to be set to a UIWebView because I want to put some additional HTML formatting around the image.

我想让照片库返回存储在iOS设备上的图像的相对路径，这样我就可以将它放在'img'HTML标签的'src'属性中。

I want to get the photo library to return the relative path of an image stored on the iOS device, so that the I can put that in the 'src' attribute of the 'img' HTML tag.

这可能吗？

编辑1

我必须修改我想要的代码，但这似乎不起作用。

I had to modify my code for what I wanted but this doesn't seem to work.

- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
    //Get Image URL from Library
    NSURL *urlPath = [info valueForKey:UIImagePickerControllerReferenceURL];
    NSString *urlString = [urlPath absoluteString];
    NSLog(urlString);

    NSURL *root = [[NSBundle mainBundle] bundleURL];
    NSString *html;
    html = @"<img src='";
    html = [html stringByAppendingString:urlString];
    html = [html stringByAppendingString:@"' />"];
    [MemeCanvas loadHTMLString:html baseURL:root];

    [picker dismissViewControllerAnimated:YES completion:^{}];
}

我能够记录资产库URL，但似乎没有在 UIWebView 上显示图像。我不知道我需要将baseURL更改为。

I am able to log the asset-library URL but it doesn't seem to be displayed the image on the UIWebView. I don't know what I need to change the baseURL to.

任何帮助表示赞赏。

编辑2

我将 UIImagePickerControllerReferenceURL 更改为 UIImagePickerControllerMediaURL 现在它崩溃了因为它不喜欢它，当我将它附加到一个字符串 stringByAppendingString：urlString

I changed UIImagePickerControllerReferenceURL to UIImagePickerControllerMediaURL and now it crashes because it doesnt like it when i append it to a string with stringByAppendingString:urlString

它给了我错误：

由于未捕获的异常而终止应用
'NSInvalidArgumentException'，原因：' *** - [__ NSCFConstantString
stringByAppendingString：]：nil参数'

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[__NSCFConstantString stringByAppendingString:]: nil argument'

你知道是什么原因引起的吗？ / p>

Do you know what could be causing this?

推荐答案

您可以使用UIImagePickerController委托来选择要编辑的图像（或网址）。

you can use UIImagePickerController delegate to select the image (or url) you want to edit.

你可以这样做：

UIImagePickerController *imagePickerController = [[UIImagePickerController alloc] init];
imagePickerController.sourceType = UIImagePickerControllerSourceTypePhotoLibrary;
imagePickerController.delegate = self;
[self presentViewController:imagePickerController animated:YES completion:nil];

在委托实现中，您可以使用图像路径或图像本身：

in the delegate implementation you can use the path of the image or the image itself:

// This method is called when an image has been chosen from the library or taken from the camera.
- (void)imagePickerController:(UIImagePickerController *)picker didFinishPickingMediaWithInfo:(NSDictionary *)info
{
//You can retrieve the actual UIImage
    UIImage *image = [info valueForKey:UIImagePickerControllerOriginalImage];
//Or you can get the image url from AssetsLibrary
    NSURL *path = [info valueForKey:UIImagePickerControllerReferenceURL];

    [picker dismissViewControllerAnimated:YES completion:nil];
}

这篇关于如何从iOS照片库中获取图像并将其显示在UIWebView中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！