如何从ios webview读取文件目录中的图像文件 [英] How to read image file at documents directory from ios webview
本文介绍了如何从ios webview读取文件目录中的图像文件的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
NSArray * paths = NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，是）;
NSString * documentsDirectory = [paths objectAtIndex：0];
NSString * objURL = @http://test.test.com/file/image.png;
NSURL * objurl = [NSURL URLWithString：objURL];
NSData * imgData = [NSData dataWithContentsOfURL：objurl];
NSString * imgFile = [NSString stringWithFormat：@％@ /％@，documentsDirectory，@image.png];
[imgData writeToFile：imgFile atomically：YES];
在我的webView中，我从我的bundle资源中加载了一个html文件以用于我的webView，我有html中的标签来读取文档目录中的image.png吗？
< html>
< body>
< img src =../ what / is / the / path / to / use / image.png/>
< / body>
< / html>
解决方案
您可以使用绝对 file：// scheme：
NSString * documentsDirectory = NSSearchPathForDirectoriesInDomains（NSDocumentDirectory，NSUserDomainMask，YES）[0];
NSString * filePath = [NSString stringWithFormat：@file：//%@/image.png，documentsDirectory];
然后，您可以运行一些javascript来更新 src 标签将其更新为新路径：
NSString * javascript = [NSString stringWithFormat：@var imageElement = document。 getElementById（'localFile'）; imageElement.setAttribute（'src'，'％@'）;，filePath];
[self.webView stringByEvaluatingJavaScriptFromString：javascript];
在您的HTML中，路径看起来像这样：
< html>
< body>
< img id =localFilesrc =file：///var/mobile/Applications/3D7D43E8-FA5E-4B19-B74C-669F7D1F3093/Documents/image.png/>
< / body>
< / html>
I am downloading image file and write to documents directory like below:
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
NSString *objURL = @"http://test.test.com/file/image.png";
NSURL *objurl = [NSURL URLWithString:objURL];
NSData *imgData = [NSData dataWithContentsOfURL:objurl];
NSString *imgFile = [NSString stringWithFormat:@"%@/%@", documentsDirectory,@"image.png"];
[imgData writeToFile:imgFile atomically:YES];
In my webView, I loaded a html file from my bundle resource to use in my webView, but how do I have the tag in html to read the image.png in documents directory?
<html>
<body>
<img src="../what/is/the/path/to/use/image.png" />
</body>
</html>
解决方案
You could give the URL for this image using an absolute path with a file:// scheme:
NSString *documentsDirectory = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask,YES)[0];
NSString *filePath = [NSString stringWithFormat:@"file://%@/image.png", documentsDirectory];
You could then run some javascript to update the src tag to update it to the new path:
NSString *javascript = [NSString stringWithFormat:@"var imageElement = document.getElementById('localFile'); imageElement.setAttribute('src', '%@');", filePath];
[self.webView stringByEvaluatingJavaScriptFromString:javascript];
In your HTML the path would look like something like:
<html>
<body>
<img id="localFile" src="file:///var/mobile/Applications/3D7D43E8-FA5E-4B19-B74C-669F7D1F3093/Documents/image.png" />
</body>
</html>
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