UIWebView是ios开发中比较常用的一个控件。我们可以用它来浏览网页、打开文档等，今天笔者在这里简单介绍下UIWebView和UISearchBar结合起来的用法，做一个简单的类浏览器。
一：首先定义这两个控件，并在.h文件中实现UISearchBarDelegate,UIWebViewDelegate两个代理
@interface TestView : UIViewController<UISearchBarDelegate,UIWebViewDelegate>
@property(nonatomic)UISearchBar* searchBar;
@property(nonatomic,retain)UIWebView* webView;
二：加载这两个控件
//加载searcBar
-(void)initSearchBar
{
self.searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(, , [UIScreen mainScreen].bounds.size.width, )];
self.searchBar.delegate = self; //接受委托
self.searchBar.text = @"http://";
//UISearchBar上按钮的默认文字为Cancel，这里改为“GO”版本不同方法有些许区别
for(id cc in [self.searchBar subviews])
{
for (UIView *view in [cc subviews]) {
if ([NSStringFromClass(view.class) isEqualToString:@"UINavigationButton"])
{
UIButton *btn = (UIButton *)view;
[btn setTitle:@"GO" forState:UIControlStateNormal];
}
}
} [self.view addSubview:self.searchBar]; }
//加载webview
-(void)initWebView
{
self.webView = [[UIWebView alloc] initWithFrame:CGRectMake(, , [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height-)];
[self.webView setUserInteractionEnabled:YES]; //设置是否支持交互
[self.webView setDelegate:self]; //接受委托
[self.webView setScalesPageToFit:YES]; //设置自动缩放
[self.view addSubview:self.webView];
}
在viewDidLoad执行加载
-(void)viewDidLoad
{
[super viewDidLoad];
[self.view setBackgroundColor:[UIColor whiteColor]];
[self initSearchBar];
[self initWebView]; }
三：实现seachBar的代理方法
#pragma UISearchBar //点击searchbar上的GO 时调用
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{
[self doSearch:searchBar];
} //点击键盘上的search时调用
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{
[searchBar resignFirstResponder];
[self doSearch:searchBar];
} //开始执行搜索
- (void)doSearch:(UISearchBar *)searchBar{
[searchBar resignFirstResponder];
NSURL* url = [NSURL URLWithString:[NSString stringWithFormat:@"%@",searchBar.text]];
NSURLRequest *request =[NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
}
在这里
NSURL* url = [NSURL URLWithString:[NSString stringWithFormat:@"%@",searchBar.text]];
NSURLRequest *request =[NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
这段代码就是为webView加载网页的方式，其他方式的还有
//加载本地文件资源
// NSURL *url = [NSURL fileURLWithPath:@"文件路径"];
// NSURLRequest *request = [NSURLRequest requestWithURL:url];
// [webView loadRequest:request]；
//读入一个HTML代码
// NSString *htmlPath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"HTML文件地址"];
// NSString *htmlString = [NSString stringWithContentsOfFile: htmlPath encoding:NSUTF8StringEncoding error:NULL];
// [webView loadHTMLString:htmlString baseURL:[NSURL fileURLWithPath:htmlPath]];
四：实现webView加载失败时的代理方法
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
UIAlertView *alterview = [[UIAlertView alloc] initWithTitle:@"访问出错" message:[error localizedDescription] delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
[alterview show];
}
另外，UIWebView常用的代理方法还有
- (void )webViewDidStartLoad:(UIWebView *)webView
//网页开始加载的时候调用 - (void )webViewDidFinishLoad:(UIWebView *)webView
//网页加载完成的时候调用 -(BOOL )webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType )navigationType
//当UIWebView加载网页的时候就会调用到此函数，然后执行webViewDidStartLoad函数，可以在函数中进行请求解析，地址分析等
代码敲完后，来看一下运行的结果