IOS開發－UI學習－UIWebView，簡單瀏覽器的製做

製做一個簡單的瀏覽器，包含網址輸入框，Search按鈕，前進、回退按鈕，UIWebView就這幾個簡單的控件。

UITextField：用來輸入網址；

UIbuttom：實現前進，後退，搜索等功能；

UIWebView：實現網頁展現。

 

準備工做：

右鍵Info.plist並Open As       Source Code，打開以後添加如下代碼段：

 

1     <key>NSAppTransportSecurity</key>
2     <dict>
3     <key>NSAllowsArbitraryLoads</key>
4     <true/>
5     </dict>

 

以上代碼段功能：有些網址爲Http，要搞成Https，具體原理之後探索出來了再補充。

 

言歸正傳，實現瀏覽器功能的具體代碼以下：

 1 #import "ViewController.h"
 2 
 3 @interface ViewController (){
 4     
 5 //    定義全局變量，各個控件
 6     UIWebView *mywebview;
 7     UIButton *backbutton;
 8     UIButton *goforbutton;
 9     UITextField *urlField;
10     UIButton *searchButton;
11 }
12 
13 @end
14 
15 @implementation ViewController
16 
17 - (void)viewDidLoad {
18     [super viewDidLoad];
19     
20 //    添加瀏覽器view，
21     mywebview = [[UIWebView alloc]initWithFrame:CGRectMake(0, 70, self.view.frame.size.width, self.view.frame.size.height-120)];
22     [self.view addSubview:mywebview];
23     
24     
25 //    網址輸入框
26     urlField = [[UITextField alloc]initWithFrame:CGRectMake(0, 20, self.view.frame.size.width-100, 50)];
27     urlField.borderStyle = UITextBorderStyleRoundedRect;
28     urlField.text= mywebview.request.URL.absoluteString;
29     [self.view addSubview:urlField];
30     
31     
32     
33 //    search button
34     searchButton = [[UIButton alloc]initWithFrame:CGRectMake(self.view.frame.size.width-100, 20, 100, 50)];
35     searchButton.backgroundColor = [UIColor redColor];
36     [searchButton setTitle:@"Search" forState:UIControlStateNormal];
37     [searchButton addTarget:self action:@selector(search:) forControlEvents:UIControlEventTouchUpInside];
38     [self.view addSubview:searchButton];
39     
40     
41 //    返回按鍵
42     backbutton = [[UIButton alloc]initWithFrame:CGRectMake(0, self.view.frame.size.height-50, 100, 50)];
43     backbutton.backgroundColor = [UIColor redColor];
44     [backbutton setTitle:@"返回" forState:UIControlStateNormal];
45     [backbutton addTarget:self action:@selector(backFbution:) forControlEvents:UIControlEventTouchUpInside];
46     [self.view addSubview:backbutton];
47     
48 //    前進按鈕
49     goforbutton = [[UIButton alloc]initWithFrame:CGRectMake(self.view.frame.size.width-100, self.view.frame.size.height-50, 100, 50)];
50     goforbutton.backgroundColor = [UIColor redColor];
51     [goforbutton setTitle:@"前進" forState:UIControlStateNormal];
52     [goforbutton addTarget:self action:@selector(goFobution:) forControlEvents:UIControlEventTouchUpInside];
53     [self.view addSubview:goforbutton];
54     
55     
56 }
57 
58 
59 //返回按鈕綁定事件
60 -(void)backFbution:(id)sender{
61     [mywebview goBack];
62 }
63 
64 
65 //前進按鈕綁定事件
66 -(void)goFobution:(id)sender{
67     [mywebview goForward];
68 }
69 
70 
71 //搜索按鈕綁定事件
72 -(void)search:(id)sender{
73     [mywebview loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:urlField.text]]];
74 }
75 
76 
77 - (void)didReceiveMemoryWarning {
78     [super didReceiveMemoryWarning];
79 }
80 
81 @end

 

運行效果以下（請無視UI所用顏色。。。。。）：

存在一個問題，就是我在百度裏面隨便點擊一個網址連接以後，能夠打開網址，但打開以後瀏覽器的網址輸入框中的網址依然是以前那個，沒有改變爲當前網站地址。這個問題遺留下來。。。