用WebView 加載出來後獲取

這是樓主在開發中遇到的問題
從後臺獲取到一段html程式碼
[[HTTPSessionManager httpManager] getWithURL:FIND_DOCTOR_OR_PATIENT_ARTICLELIST params:parameters success:^(id json) {
        NSMutableArray *arr = [NSJSONSerialization JSONObjectWithData:json options:NSJSONReadingMutableContainers | NSJSONReadingAllowFragments error:nil
 
];
        XMGLog(@"%lu",(unsigned long)arr.count);

//        for (id key in [arr[0][@"data"] allKeys]) {
//            XMGLog(@"%@=%@",key,arr[0][@"data"][key]);
//        }

        //baseURL可以為空，但baseURL為空是時，有些圖片在webView不顯示
        [weakSelf.webView loadHTMLString:arr[0][@"data"][@"context"]（） baseURL:[NSURL
 
 URLWithString:FIND_DOCTOR_OR_PATIENT_ARTICLELIST]];


    } failure:^(NSError *error) {
        XMGLog(@"%@",error);
    }];
//webView代理方法
- (void)webViewDidFinishLoad:(UIWebView *)webView {
    //有時候圖片可能會過大，此處設定讓圖片完整顯示
    NSString *str = @"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '100%'"
 
;
    [_webView stringByEvaluatingJavaScriptFromString:str];

    //獲取webView中的內容文字
    self.label.text = [self.webView stringByEvaluatingJavaScriptFromString:@"document.documentElement.innerText"];

    //這裡是js，主要目的實現對webView中圖片url的獲取
    static  NSString * const jsGetImages =
    @"function getImages(){\
    var objs = document.getElementsByTagName(\"img\");\
    var imgScr = '';\
    for(var i=0;i<objs.length;i++){\
    imgScr = imgScr + objs[i].src + '+';\
    };\
    return imgScr;\
    };";

    [webView stringByEvaluatingJavaScriptFromString:jsGetImages];//注入js方法
    //得到圖片url拼接後的字串  每個圖片URL用"+"隔開
    NSString *urlResurlt = [webView stringByEvaluatingJavaScriptFromString:@"getImages()"];

    self.label.text = urlResurlt;

}

利用富文字獲取

//用富文字將html程式碼中的正文提取出來，只能獲取字串
        NSMutableAttributedString * attrStr = [[NSMutableAttributedString alloc] initWithData:[healthNews.context dataUsingEncoding:NSUnicodeStringEncoding] options:@{ NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType } documentAttributes:nil error:nil];
        if (attrStr.length >=70) {
            //擷取前面70個字元
            [attrStr deleteCharactersInRange:NSMakeRange(70, attrStr.length-70)];
        }