UIWebView是ios開發中比較常用的一個控件。我們可以用它來浏覽網頁、打開文檔等，今天筆者在這裡簡單介紹下UIWebView和UISearchBar結合起來的用法，做一個簡單的類浏覽器。
一：首先定義這兩個控件，並在.h文件中實現UISearchBarDelegate,UIWebViewDelegate兩個代理
@interface TestView : UIViewController<UISearchBarDelegate,UIWebViewDelegate>
@property(nonatomic)UISearchBar* searchBar;
@property(nonatomic,retain)UIWebView* webView;
二：加載這兩個控件
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//加載searcBar
-(void)initSearchBar
{
self.searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(0, 20, [UIScreen mainScreen].bounds.size.width, 40)];
self.searchBar.delegate = self; //接受委托
self.searchBar.text = @"http://";
//UISearchBar上按鈕的默認文字為Cancel，這裡改為“GO”版本不同方法有些許區別
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];
}
//加載webview
-(void)initWebView
{
self.webView = [[UIWebView alloc] initWithFrame:CGRectMake(0, 60, [UIScreen mainScreen].bounds.size.width, [UIScreen mainScreen].bounds.size.height-60)];
[self.webView setUserInteractionEnabled:YES]; //設置是否支持交互
[self.webView setDelegate:self]; //接受委托
[self.webView setScalesPageToFit:YES]; //設置自動縮放
[self.view addSubview:self.webView];
}
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在viewDidLoad執行加載
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-(void)viewDidLoad
{
[super viewDidLoad];
[self.view setBackgroundColor:[UIColor whiteColor]];
[self initSearchBar];
[self initWebView];
}
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三：實現seachBar的代理方法
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#pragma UISearchBar
//點擊searchbar上的GO 時調用
- (void)searchBarCancelButtonClicked:(UISearchBar *)searchBar{
[self doSearch:searchBar];
}
//點擊鍵盤上的search時調用
- (void)searchBarSearchButtonClicked:(UISearchBar *)searchBar{
[searchBar resignFirstResponder];
[self doSearch:searchBar];
}
//開始執行搜索
- (void)doSearch:(UISearchBar *)searchBar{
[searchBar resignFirstResponder];
NSURL* url = [NSURL URLWithString:[NSString stringWithFormat:@"%@",searchBar.text]];
NSURLRequest *request =[NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
}
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在這裡
NSURL* url = [NSURL URLWithString:[NSString stringWithFormat:@"%@",searchBar.text]];
NSURLRequest *request =[NSURLRequest requestWithURL:url];
[self.webView loadRequest:request];
這段代碼就是為webView加載網頁的方式，其他方式的還有
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//加載本地文件資源
// NSURL *url = [NSURL fileURLWithPath:@"文件路徑"];
// NSURLRequest *request = [NSURLRequest requestWithURL:url];
// [webView loadRequest:request]；
//讀入一個HTML代碼
// 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]];
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四：實現webView加載失敗時的代理方法
- (void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error
{
UIAlertView *alterview = [[UIAlertView alloc] initWithTitle:@"訪問出錯" message:[error localizedDescription] delegate:nil cancelButtonTitle:nil otherButtonTitles:@"OK", nil];
[alterview show];
}
另外，UIWebView常用的代理方法還有
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- (void )webViewDidStartLoad:(UIWebView *)webView
//網頁開始加載的時候調用
- (void )webViewDidFinishLoad:(UIWebView *)webView
//網頁加載完成的時候調用
-(BOOL )webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType )navigationType
//當UIWebView加載網頁的時候就會調用到此函數，然後執行webViewDidStartLoad函數，可以在函數中進行請求解析，地址分析等
