Buscar para resaltar texto en PDF utilizando UIWebView
Soy nuevo en el desarrollo de iOS. Tengo UIWebView para mostrar los artículos de la página Pdf desde la URL. Necesito buscar una cadena o texto y resaltar. No puedo buscar y resaltar el texto en PDF usando UIWebView.Pdf se está cargando bien pero el texto de búsqueda no está resaltado.Su trabajo solo para HTML que necesito en PDF
Mi código
ViewController.h
#import <UIKit/UIKit.h>
#import "SearchWebView.h"
@interface ViewController : UIViewController<UIWebViewDelegate>
{
IBOutlet SearchWebView *webView1;
}
@end
ViewController.m
#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
NSURL *targetURL = [NSURL URLWithString:@"http://www.adobe.com/content/dam/Adobe/en/devnet/acrobat/pdfs/pdf_open_parameters.pdf"];
NSURLRequest *request = [NSURLRequest requestWithURL:targetURL];
webView1.delegate=self;
[webView1 loadRequest:request];
[webView1 highlightAllOccurencesOfString:@"guide"];
}
-(void)webViewDidFinishLoad:(UIWebView *)webView
{
[webView1 highlightAllOccurencesOfString:@"guide"];
}
@end
SearchWebView.h
#import <Foundation/Foundation.h>
@interface SearchWebView : UIWebView
- (NSInteger)highlightAllOccurencesOfString:(NSString*)str;
- (void)removeAllHighlights;
@end
SearchWebView.m
#import "SearchWebView.h"
@implementation 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
SearchWebView.js
// We're using a global variable to store the number of occurrences
var MyApp_SearchResultCount = 0;
// helper function, recursively searches in elements and their child nodes
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="black";
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);
}