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(0, 70, self.view.frame.size.width, self.view.frame.size.height-120)];
    [self.view addSubview:mywebview];
    
    
//    网址输入框
    urlField = [[UITextField alloc]initWithFrame:CGRectMake(0, 20, self.view.frame.size.width-100, 50)];
    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-100, 20, 100, 50)];
    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(0, self.view.frame.size.height-50, 100, 50)];
    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-100, self.view.frame.size.height-50, 100, 50)];
    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。。。