IOS开发－UI学习－UIWebView，简单浏览器的制作

制作一个简单的浏览器，包含网址输入框，Search按钮，前进、回退按钮，UIWebView就这几个简单的控件。

UITextField：用来输入网址；

UIbuttom：实现前进，后退，搜索等功能；

UIWebView：实现网页展示。

准备工作：

右键Info.plist并Open As       Source Code，打开之后添加以下代码段：

     <key>NSAppTransportSecurity</key>
     <dict>
     <key>NSAllowsArbitraryLoads</key>
     <true/>
     </dict>

以上代码段功能：有些网址为Http，要搞成Https，具体原理以后探索出来了再补充。

言归正传，实现浏览器功能的具体代码如下：

 #import "ViewController.h"

 @interface ViewController (){

 //    定义全局变量，各个控件
     UIWebView *mywebview;
     UIButton *backbutton;
     UIButton *goforbutton;
     UITextField *urlField;
     UIButton *searchButton;
 }

 @end

 @implementation ViewController

 - (void)viewDidLoad {
     [super viewDidLoad];

 //    添加浏览器view，
     mywebview = [[UIWebView alloc]initWithFrame:CGRectMake(, , self.view.frame.size.width, self.view.frame.size.height-)];
     [self.view addSubview:mywebview];

 //    网址输入框
     urlField = [[UITextField alloc]initWithFrame:CGRectMake(, , self.view.frame.size.width-, )];
     urlField.borderStyle = UITextBorderStyleRoundedRect;
     urlField.text= mywebview.request.URL.absoluteString;
     [self.view addSubview:urlField];

 //    search button
     searchButton = [[UIButton alloc]initWithFrame:CGRectMake(self.view.frame.size.width-, , , )];
     searchButton.backgroundColor = [UIColor redColor];
     [searchButton setTitle:@"Search" forState:UIControlStateNormal];
     [searchButton addTarget:self action:@selector(search:) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:searchButton];

 //    返回按键
     backbutton = [[UIButton alloc]initWithFrame:CGRectMake(, self.view.frame.size.height-, , )];
     backbutton.backgroundColor = [UIColor redColor];
     [backbutton setTitle:@"返回" forState:UIControlStateNormal];
     [backbutton addTarget:self action:@selector(backFbution:) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:backbutton];

 //    前进按钮
     goforbutton = [[UIButton alloc]initWithFrame:CGRectMake(self.view.frame.size.width-, self.view.frame.size.height-, , )];
     goforbutton.backgroundColor = [UIColor redColor];
     [goforbutton setTitle:@"前进" forState:UIControlStateNormal];
     [goforbutton addTarget:self action:@selector(goFobution:) forControlEvents:UIControlEventTouchUpInside];
     [self.view addSubview:goforbutton];

 }

 //返回按钮绑定事件
 -(void)backFbution:(id)sender{
     [mywebview goBack];
 }

 //前进按钮绑定事件
 -(void)goFobution:(id)sender{
     [mywebview goForward];
 }

 //搜索按钮绑定事件
 -(void)search:(id)sender{
     [mywebview loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlField.text]]];
 }

 - (void)didReceiveMemoryWarning {
     [super didReceiveMemoryWarning];
 }

 @end

运行效果如下（请无视UI所用颜色。。。。。）：

存在一个问题，就是我在百度里面随便点击一个网址链接之后，可以打开网址，但打开之后浏览器的网址输入框中的网址依然是之前那个，没有改变为当前网站地址。这个问题遗留下来。。。