ios開發入門篇（四）：UIWebView結合UISearchBar的簡單用法

ios開發入門篇（四）：UIWebView結合UISearchBar的簡單用法
UIWebView是ios開發中比較常用的一個控制項。我們可以用它來瀏覽網頁、開啟文檔等，今天筆者在這裡簡單介紹下UIWebView和UISearchBar結合起來的用法，做一個簡單的類瀏覽器。 　　一：首先定義這兩個控制項，並在.h檔案中實現UISearchBarDelegate,UIWebViewDelegate兩個代理 　　@interface TestView : UIViewController<UISearchBarDelegate,UIWebViewDelegate> 　　@property(nonatomic)UISearchBar* searchBar; 　@property(nonatomic,retain)UIWebView* webView;  　　二：載入這兩個控制項 複製代碼//載入searcBar-(void)initSearchBar{    self.searchBar = [[UISearchBar alloc]initWithFrame:CGRectMake(0, 20, [UIScreen mainScreen].bounds.size.width, 40)];    self.searchBar.delegate = self;             //接受委託    self.searchBar.text = @"http://";    //UISearchBar上按鈕的預設文字為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];    }//載入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];             //設定是否支援互動    [self.webView setDelegate:self];                          //接受委託    [self.webView setScalesPageToFit:YES];                    //設定自動縮放    [self.view addSubview:self.webView];}複製代碼在viewDidLoad執行載入 複製代碼-(void)viewDidLoad{    [super viewDidLoad];    [self.view setBackgroundColor:[UIColor whiteColor]];    [self initSearchBar];    [self initWebView];    }複製代碼 　　三：實現seachBar的代理方法 複製代碼#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];} //開始執行搜尋  - (void)doSearch:(UISearchBar *)searchBar{    [searchBar resignFirstResponder];    NSURL* url = [NSURL URLWithString:[NSString stringWithFormat:@"%@",searchBar.text]];    NSURLRequest *request =[NSURLRequest requestWithURL:url];    [self.webView loadRequest:request];}複製代碼在這裡 　　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載入網頁的方式，其他方式的還有 複製代碼 //載入本地檔案資源//    NSURL *url = [NSURL fileURLWithPath:@"檔案路徑"]; //    NSURLRequest *request = [NSURLRequest requestWithURL:url];//    [webView loadRequest:request]；//讀入一個HTML代碼//    NSString *htmlPath = [[[NSBundle mainBundle] bundlePath] stringByAppendingPathComponent:@"HTML檔案地址"];//    NSString *htmlString = [NSString stringWithContentsOfFile: htmlPath encoding:NSUTF8StringEncoding error:NULL];//    [webView loadHTMLString:htmlString baseURL:[NSURL fileURLWithPath:htmlPath]];複製代碼四：實現webView載入失敗時的代理方法- (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 複製代碼- (void )webViewDidStartLoad:(UIWebView  *)webView   //網頁開始載入的時候調用 - (void )webViewDidFinishLoad:(UIWebView  *)webView  //網頁載入完成的時候調用 -(BOOL )webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType )navigationType//當UIWebView載入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