A.基本使用
1.概念
iOS内置的浏览器控件
Safari浏览器就是通过UIWebView实现的
2.用途：制作简易浏览器
（1）基本请求
创建请求
加载请求
（2）代理监听webView加载，例如提示正在加载
（3）前进、后退
使用NavigationController，在底部加上导航栏（勾选showToolBar），加上回退和前进按钮
（4）给顶部导航栏加上地址栏
UISearchBar
代理监听“搜索”按钮，提取地址栏文本
1//2//ViewController.m3//UIWebViewdDemo4//5//Created by hellovoidworld on 15/1/30.6//Copyright (c) 2015年 hellovoidworld. All rights reserved.7//89#import"ViewController.h"1011@interfaceViewController () <UISearchBarDelegate, UIWebViewDelegate>1213@PRoperty (weak, nonatomic) IBOutlet UIWebView *webView;1415@property (weak, nonatomic) IBOutlet UIBarButtonItem *backButton;16@property (weak, nonatomic) IBOutlet UIBarButtonItem *forwardButton;17- (IBAction)back:(UIBarButtonItem *)sender;18- (IBAction)forward:(UIBarButtonItem *)sender;1920@end2122@implementationViewController2324- (void)viewDidLoad {25[super viewDidLoad];26//Do any additional setup after loading the view, typically from a nib.2728//创建一个搜索栏29UISearchBar *searchBar =[[UISearchBar alloc] init];30searchBar.frame = CGRectMake(0,0,300,40);31searchBar.delegate=self;3233self.navigationItem.titleView =searchBar;3435self.webView.delegate=self;36}37383940- (IBAction)back:(UIBarButtonItem *)sender {41NSLog(@"后退");42[self.webView goBack];43}4445- (IBAction)forward:(UIBarButtonItem *)sender {46NSLog(@"前进");47[self.webView goForward];48}4950#pragmamark - UIWebViewDelegate51- (void)webViewDidStartLoad:(UIWebView *)webView {52NSLog(@"开始加载");53}5455- (void)webViewDidFinishLoad:(UIWebView *)webView {56NSLog(@"完成加载");5758//设置后退、前进按钮59if([self.webView canGoBack]) {60self.backButton.enabled =YES;61}else{62self.backButton.enabled =NO;63}6465if([self.webView canGoForward]) {66self.forwardButton.enabled =YES;67}else{68self.forwardButton.enabled =NO;69}70}7172#pragmamark - UISearchBarDelegate73/** 点击搜索按钮（虚拟键盘上)*/74- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar {75NSString *str =searchBar.text;76NSURL *url = [NSURL URLWithString:[NSString stringWithFormat:@"http://%@", str]];77NSURLRequest *request =[NSURLRequest requestWithURL:url];7879[self.webView loadRequest:request];80}8182@end
3.加载本地资源
html、txt、doc、PPT、MP4、pdf
直接请求即可
4.自动识别电话、邮箱、地址
// 识别所有类型的数据
self.webView.dataDetectorTypes = UIDataDetectorTypeAll;
B.其他用途
1.OC执行javascript
1/** 运行js代码*/2-(IBAction)runJs {3NSString *str =@"alert('hello, world!');";4[self.webView stringByEvaluatingJavascriptFromString:str];5}
2.javascript调用OC
在javascript中发送网页请求，使用OC截取，根据内容判断调用相应方法
这里使用js代码呼出相册选择:
网页 & js 代码：
1<%@ page language="java"contentType="text/html; charset=UTF-8"2pageEncoding="UTF-8"%>3<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">4<html>5<head>6<metahttp-equiv="Content-Type"content="text/html; charset=UTF-8">7<title>运行OC代码</title>8</head>9<body>1011<scripttype="text/javascript">12functionrunOC() {13window.location.href="ios://openAlbum";14}15</script>1617<inputtype="button"value="运行OC代码"onclick="runOC();"/>1819</body>20</html>
OC代码：
1/** webView发送请求之前都会调用，可以拦截请求，选择加载（返回YES）还是不加载（返回NO）*/2- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {34//拦截请求5NSString *urlStr =request.URL.absoluteString;6NSRange range = [urlStr rangeOfString:@"ios://"];78//如果是ios请求9if(range.length !=0) {10//方法名11NSString *method = [urlStr substringFromIndex:range.location +range.length];1213//包装SEL14SEL selector =NSSelectorFromString(method);1516//执行方法17[self performSelector:selector withObject:nil];18}1920returnYES;21}2223/** 打开相册*/24- (void) openAlbum {25//创建一个相片选择控制器26UIImagePickerController *imagePC =[[UIImagePickerController alloc] init];27[imagePC setSourceType:UIImagePickerControllerSourceTypePhotoLibrary];//使用相册来源2829[self presentViewController:imagePC animated:YES completion:^{30NSLog(@"呼出相册");31}];32}