（iOS开发）webView的使用与注意事项

webView的简单使用：

1、

myWebView =[[UIWebView alloc]initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight+64)];
myWebView.backgroundColor=[UIColor colorWithRed:248/255.0 green:244/255.0 blue:232/255.0 alpha:1.0];
myWebView.delegate=self;
myWebView.userInteractionEnabled=YES;
[myWebView setOpaque:YES];//opaque YES透明
// [myWebView setScalesPageToFit:YES];//自动缩放以适应屏幕
// myWebView.scrollView.bounces = NO;//不允许漏出空白背景
[self.view addSubview:myWebView];
//加载网页的方式
[myWebView loadHTMLString:_urlString baseURL:nil];
//其他加载网页的方式
//1.创建并加载远程网页
//NSURL *url = [NSURL URLWithString:@"http://www.baidu.com"];
//[myWebView loadRequest:[NSURLRequest requestWithURL:url]];
//2.加载本地文件资源
/* NSURL *url = [NSURL fileURLWithPath:filePath];
NSURLRequest *request = [NSURLRequest requestWithURL:url];
[myWebView loadRequest:request];*/
//3.读入一个HTML，直接写入一个HTML代码
//NSString *htmlPath = [[[NSBundle mainBundle]bundlePath]stringByAppendingString:@"webapp/loadar.html"];
//NSString *htmlString = [NSString stringWithContentsOfURL:htmlPath encoding:NSUTF8StringEncoding error:NULL];
//[myWebView loadHTMLString:htmlString baseURL:[NSURL fileURLWithPath:htmlPath]];


H5交互部分：

//如果是H5页面里面自带的返回按钮处理如下:
#pragma mark - webViewDelegate
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType {
NSString * requestString = [[request URL] absoluteString];//获取请求的绝对路径
requestString = [requestString stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
//获取H5页面里面按钮的操作方法,根据这个进行判断返回是内部的还是push的上一级页面
if ([requestString hasPrefix:@"goback:"]) {
[self.navigationController popViewControllerAnimated:YES];
}else{
[self.webView goBack];
}
return YES;
}

//获取当前页面的title和url
- (void)webViewDidFinishLoad:(UIWebView *)webView
{
//隐藏HUD菊花
NSString * title = [webView stringByEvaluatingJavaScriptFromString:@"document.title"];//获取当前页面的title
self.title = title;
//获取当前网页的html
self.currentURL = webView.request.URL.absoluteString;
NSLog(@"title-%@--url-%@--",self.title,self.currentURL);
NSString *lJs = @"document.documentElement.innerHTML";
self.currentHTML = [webView stringByEvaluatingJavaScriptFromString:lJs];
}

参考文章：http://www.jianshu.com/p/769b046edc3f

注意事项：

1、webView上面添加tap等手势的时候必须添加：(web
view手势)

//必须实现 否则无法触发webView的点击事件
- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldRecognizeSimultaneouslyWithGestureRecognizer:(UIGestureRecognizer *)otherGestureRecognizer{

return YES;

}

2、设置显示字体大小

//方法中加入js代码  设置显示字体大小是原来大小的多少
- (void)webViewDidFinishLoad:(UIWebView *)webView

{
NSString *str = @"document.getElementsByTagName('body')[0].style.webkitTextSizeAdjust= '100%'";

[myWebView stringByEvaluatingJavaScriptFromString:str];

}

3、解决双击放大的问题

_webView.multipleTouchEnabled=NO

- (UIView*)viewForZoomingInScrollView:(UIScrollView*)scrollView {

returnnil;

}

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