@interface ViewController : UIViewController <UIWebViewDelegate>{
    IBOutlet UITextField * myTextFiedld;
    IBOutlet UIWebView * myWebView;
}

@property (nonatomic,retain)UITextField * myTextFiedld;
@property (nonatomic,retain)UIWebView * myWebView;

-(IBAction)changeLocation:(id)sender;

@end

@implementation ViewController


@synthesize  myTextFiedld;
@synthesize myWebView;

//Button点击事件
-(IBAction)changeLocation:(id)sender{
    myWebView.delegate = self;//注意：一定要设置委托
    [myTextFiedld resignFirstResponder];//放弃第一响应者
    //通过输入的文字构建URL对象
    NSURL * url = [NSURL URLWithString:myTextFiedld.text];
    //通过URL对象构建响应对象
    NSURLRequest *req = [NSURLRequest requestWithURL:url];
    //通过响应对象传入WEB视图中
    [myWebView loadRequest:req];
}

//浏览器加载完成事件
-(void)webViewDidFinishLoad:(UIWebView *)webView{
    NSLog(@"finsh...");
    //这个方法可以执行一段JavaScript脚本
    NSString * s = [myWebView stringByEvaluatingJavaScriptFromString:@"document.documentElement.textContent"];
    NSLog(@"%@",s);
}



//浏览器加载失败事件
-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error{
    NSLog(@"error...");
    //NSError对象以后会常常用到，非常有用。
    NSLog(@"%@",[error description]);
}


- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


- (void)dealloc
{
    [myTextFiedld release];
    [myWebView release];
    [super dealloc];
}
@end