代码语言：javascript复制
#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 - 加载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</pre> 
