ios在UIWebView中搜索并高亮度显示关键字-创新互联

1.创建两个文件（SearchWebView.js（文章末尾有写），UIWebView+SearchWebView（类目））

引自：http://www.cnblogs.com/zhuolaiqiang/archive/2011/06/24/2088906.html

//js文件内容

SearchWebView.js:

var MyApp_SearchResultCount = 0;

function MyApp_HighlightAllOccurencesOfStringForElement(element,keyword) {

  if (element) {

    if (element.nodeType == 3) {    // Text node

      while (true) {

        var value = element.nodeValue; // Search for keyword in text node

        var idx = value.toLowerCase().indexOf(keyword);

        if (idx < 0) break;       // not found, abort

        var span = document.createElement("span");

        var text = document.createTextNode(value.substr(idx,keyword.length));

        span.appendChild(text);

        span.setAttribute("class","MyAppHighlight");

        span.style.backgroundColor="yellow";

        span.style.color="Red";

        text = document.createTextNode(value.substr(idx+keyword.length));

        element.deleteData(idx, value.length - idx);

        var next = element.nextSibling;

        element.parentNode.insertBefore(span, next);

        element.parentNode.insertBefore(text, next);

        element = text;

        MyApp_SearchResultCount++; // update the counter

      }

    } else if (element.nodeType == 1) { // Element node

      if (element.style.display != "none" && element.nodeName.toLowerCase() != 'select') {

        for (var i=element.childNodes.length-1; i>=0; i--) {

          MyApp_HighlightAllOccurencesOfStringForElement(element.childNodes[i],keyword);

        }

      }

    }

  }

}

// the main entry point to start the search

function MyApp_HighlightAllOccurencesOfString(keyword) {

  MyApp_RemoveAllHighlights();

  MyApp_HighlightAllOccurencesOfStringForElement(document.body, keyword.toLowerCase());

}

// helper function, recursively removes the highlights in elements and their childs

function MyApp_RemoveAllHighlightsForElement(element) {

  if (element) {

    if (element.nodeType == 1) {

      if (element.getAttribute("class") == "MyAppHighlight") {

        var text = element.removeChild(element.firstChild);

        element.parentNode.insertBefore(text,element);

        element.parentNode.removeChild(element);

        return true;

      } else {

        var normalize = false;

        for (var i=element.childNodes.length-1; i>=0; i--) {

          if (MyApp_RemoveAllHighlightsForElement(element.childNodes[i])) {

            normalize = true;

          }

        }

        if (normalize) {

          element.normalize();

        }

      }

    }

  }

  return false;

}

// the main entry point to remove the highlights

function MyApp_RemoveAllHighlights() {

  MyApp_SearchResultCount = 0;

  MyApp_RemoveAllHighlightsForElement(document.body);

}

//UIWebView+SearchWebView.h

#import

@interface UIWebView (SearchWebView)

- (NSInteger)highlightAllOccurencesOfString:(NSString*)str;

- (void)removeAllHighlights;

@end

//UIWebView+SearchWebView.m

#import "UIWebView+SearchWebView.h"

@implementation UIWebView (SearchWebView)

- (NSInteger)highlightAllOccurencesOfString:(NSString*)str

{

  NSString *path = [[NSBundle mainBundle] pathForResource:@"SearchWebView" ofType:@"js"];

  NSString *jsCode = [NSString stringWithContentsOfFile:path encoding:NSUTF8StringEncoding error:nil];

  [self stringByEvaluatingJavaScriptFromString:jsCode];

  NSString *startSearch = [NSString stringWithFormat:@"MyApp_HighlightAllOccurencesOfString('%@')",str];

  [self stringByEvaluatingJavaScriptFromString:startSearch];

  NSString *result = [self stringByEvaluatingJavaScriptFromString:@"MyApp_SearchResultCount"];

  return [result integerValue];

}

- (void)removeAllHighlights

{

  [self stringByEvaluatingJavaScriptFromString:@"MyApp_RemoveAllHighlights()"];

}

@end

//在调用的UIWebView中调用搜索关键字，记住，一定要在加载网页后显示（写在-(void)webViewDidFinishLoad:代理方法里）

[webView1 highlightAllOccurencesOfString:@“搜索的关键字”];

Xcode 新建js文件

解决方法：新建一个文件（Other -> Empty ->命名为.js的文件）

Xcode编译WebApps找不到js的错误解决办法

解决方法：在targets  -> Build Phases ->  Copy Bundle Resources  -> + (将js文件加进Copy  Bundle Resources)

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