UIWebView的使用，简单浏览器的实现

#import "ViewController.h"



@interface ViewController () <UIWebViewDelegate>



@property(nonatomic,weak)UIWebView* web;

@end



@implementation ViewController



- (void)viewDidLoad {

    [super viewDidLoad];

    

    [self _setTextField];

    

    [self _loadWebView];

    

}



#pragma mark - 设置输入框

- (void)_setTextField{

    self.tf.clearButtonMode=UITextFieldViewModeWhileEditing;

}



#pragma mark - 载入WebView

- (void)_loadWebView{

    UIWebView* web=[[UIWebView alloc] init];

    web.frame=CGRectMake(0,self.view.frame.size.height,self.view.frame.size.width,self.view.frame.size.height-42 );

    self.web=web;

    web.delegate=self;

    [self.view addSubview:web];

    

    

}



#pragma mark - 放弃第一响应

-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event{

    [self.tf resignFirstResponder];

    

}



#pragma mark - Action

- (IBAction)backAction:(id)sender {

    [self.web goBack];

//    self.web.frame=CGRectMake(0,self.view.frame.size.height,self.view.frame.size.width,self.view.frame.size.height-42 );

    

}



- (IBAction)forwardAction:(id)sender {

    [self.web goForward];

    self.web.frame=CGRectMake(0,20,self.view.frame.size.width,self.view.frame.size.height-50);

}



- (IBAction)undoAction:(id)sender {

    [self.web stopLoading];

}



- (IBAction)refreshAction:(id)sender {

    [self.web reload];

}



- (IBAction)searchAction:(id)sender {

    [self.tf resignFirstResponder];

    

    self.web.frame=CGRectMake(0,20,self.view.frame.size.width,self.view.frame.size.height-60);



    [self _sendRequest];

}



#pragma mark - UIWebViewDelegate

- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType{

    

    

    return YES;

}



- (void)webViewDidStartLoad:(UIWebView *)webView{



}



- (void)webViewDidFinishLoad:(UIWebView *)webView{

//    NSLog(@"%d===%d",[webView canGoBack],[webView canGoForward]);

    self.backBt.enabled=[webView canGoBack];

    self.forwardBt.enabled=[webView canGoForward];

    self.refresh.enabled=([webView canGoBack] ||[webView canGoForward]);

}



- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{

    NSLog(@"%@",error);



}



- (void)_sendRequest{

    //http://www.baidu.com

    NSURL* url=[NSURL URLWithString:self.tf.text];

    NSURLRequest* request=[NSURLRequest requestWithURL:url];

    [self.web loadRequest:request];

}



@end