iOS 处理HTML中的img标签src= blob:file:///XXXXX

编辑于2019-06-28 。

正常来讲,直接用这个方法

 NSData *imageData = [NSData dataWithContentsOfFile:path];//path为 blob:file:///XXXXX

来处理的话, imageData的值为空,可以这么试试,曲线救国

1.用js方法,将image转成base64字符

下边代码可以直接保存成html文件测试,不过需要解决下跨域问题,推荐使用Chrome浏览器,
解决方法: Mac上解决Chrome浏览器跨域问题
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<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="Access-Control-Allow-Origin" content="*">
    <title>js 图片转base64方式</title>
</head>

<body>
    <img  id="image" src="img.png">
    <img  id="image" src="img2.png">
    <img  id="image" src="img3.png">
    <button onclick="getBase64Str();"> 获取 </button>
    <p id="container2"></p>

<script type = "text/javascript">
function getBase64Image(img) {  
     var canvas = document.createElement("canvas");  
     canvas.width = img.width;  
     canvas.height = img.height;  
     var ctx = canvas.getContext("2d");  
     ctx.drawImage(img, 0, 0, img.width, img.height);  
     var ext = img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase();  
     var dataURL = canvas.toDataURL("image/"+ext);  
     return dataURL;  
}  

function getBase64Str() {
    var imgSrc = "file:///Users/ruanmei/Desktop/1/img.png";
    var images = document.getElementsByTagName('img');
    for (var i = 0; i < images.length; i) {  
          var image = images[i];
          console.log(image.src); 
          if (image.src ==imgSrc) {
              var base64 = getBase64Image(image);  
              console.log(base64);  
          }
          i++;
    }  
}  
 </script>
</body>
</html>

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JS代码

function getBase64Image(img) {
    var canvas = document.createElement("canvas");
    canvas.width = img.width;
    canvas.height = img.height;
    var ctx = canvas.getContext("2d");
    ctx.drawImage(img, 0, 0, img.width, img.height);
    var ext = img.src.substring(img.src.lastIndexOf(".")+1).toLowerCase();
    var dataURL = canvas.toDataURL("image/"+ext);
    return dataURL;
}

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//这个方法可以放到webview的类目中
- (NSString *)getBase64ImageWithURL:(NSString *)imageURL{

    NSString *trigger = [NSString stringWithFormat:@"getBase64Image(\"%@\");",imageURL];
    NSString * base64Str  = [self stringByEvaluatingJavaScriptFromString:trigger];
    return base64Str;
}

2.将转换出来的base64字符转换为NSData

这一步就简单了

//获取到base64字符串
NSString * Base64Str  = [self.webview getBase64ImageWithURL:homePath];

NSURL * baseImageUrl = [NSURL URLWithString:Base64Str];//先转化为NSURL
NSData * imageData = [NSData dataWithContentsOfURL:baseImageUrl];//base64字符串转data

完成。
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这个方法支持memoji输入

最后编辑于：2019.08.28 08:55:54