UIWebView的用法

最新推荐文章于 2022-08-21 14:02:22 发布

原创最新推荐文章于 2022-08-21 14:02:22 发布 · 302 阅读

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（1）创建
UIWebView *myWebView=[[UIWebViewalloc] initWithFrame:CGRectMake(0, 20, 320, 300)];
(2)加载网页
NSURL *url=[NSURLURLWithString:@”http://www.google.com.hk“];

 NSURLRequest *request=[[NSURLRequestalloc] initWithURL:url];

 [myWebView loadRequest:request];

（3）是否与用户交互（即用户能不能控制webview）
[myWebView setUserInteractionEnabled:YES];
（4）显示 UIWebView
[self.view addSubview:myWebView];
（5）导航

 [webView goBack];//返回

[webView goForward];//向前
[webView reload];//重新加载数据
[webView stopLoading];//停止加载数据
（6）委托

 1.-(BOOL)webView:(UIWebView *)webView  shouldStartLoadWithRequest:(NSURLRequest *)request

      navigationType:(UIWebViewNavigationType)navigationType;

web视图指示加载内容时通知。应该返回YES开始加载。导航提供的类型参数，是指请求的来源，可以是下列任何一个：
UIWebViewNavigationTypeLinkClicked
UIWebViewNavigationTypeFormSubmitted
UIWebViewNavigationTypeBackForward
UIWebViewNavigationTypeReload
UIWebViewNavigationTypeFormResubmitted
UIWebViewNavigationTypeOther

 2.-(void)webViewDidStartLoad:(UIWebView *)webView;//当开始请求的时候被通知
 3.-(void)webViewDidFinishLoad:(UIWebView *)webView;//当结束请求的时候被通知
 4.-(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error;//当请求中出现错误时被通知

（7）UIWebView和JS交互

 1》在Objective-C代码中调用JS

 使用stringByEvaluatingJavaScriptFromString方法，需要等到UIWebView中的页面加载完成之后去调用。

 -(void) webViewDidFinishLoad:(UIWebView *)webView{

     [self.activityViewstopAnimating];



     [myWebView stringByEvaluatingJavaScriptFromString:@"function test(){ alert(123123123)}"];

     [myWebView stringByEvaluatingJavaScriptFromString:@"test();"];//调用

 }
 2》在JS中调用Objective-C代码

JS代码：
function sendCommand(cmd,param){
var url=”testapp:”+cmd+”:”+param;
document.location = url;
}
function clickLink(){
sendCommand(“alert”,”你好吗？”);
}

Objective-C代码：
- (BOOL)webView:(UIWebView )webView shouldStartLoadWithRequest:(NSURLRequest )request navigationType:(UIWebViewNavigationType)navigationType {

NSString *requestString = [[request URL] absoluteString];  
NSArray *components = [requestString componentsSeparatedByString:@":"];  
if ([components count] > 1 && [(NSString *)[components objectAtIndex:0] isEqualToString:@"testapp"]) {  
    if([(NSString *)[components objectAtIndex:1] isEqualToString:@"alert"])   
    {  
        UIAlertView *alert = [[UIAlertView alloc]   
                              initWithTitle:@"Alert from Cocoa Touch" message:[components objectAtIndex:2]  
                              delegate:self cancelButtonTitle:nil  
                              otherButtonTitles:@"OK", nil];  
        [alert show];  
    }  
    return NO;  
}  
return YES;

}