1.当实例化的UIWebview 设置了属性scalesPageToFit = YES;
当双击UIWebview时，webpage会进行缩放操作，取消webPage放大的操作，在HTML中加入下面字段。
<meta name="viewport" content="width=device-width, initial-scale=0.5, maximum-scale=0.5, minimum-scale=0.5, user-scalable=no" />
2.有时背景太大或页面太长，而我们不想让webview进行滑动，解决方案：
for (id subview in self.webview.subviews)
if ([[subview class] isSubclassOfClass: [UIScrollView class]])
{
((UIScrollView *)subview).bounces = NO;
((UIScrollView *)subview).scrollEnabled = NO;
}
3.让webview响应点击（非双击）事件，一是启动UIWebview的用户响应，二是实现委托（点击后的事件）：
webview.userInteractionEnabled = YES;
webview.delegate = self;
委托事件实现如下：
- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType
{
NSURL *requestURL = [ [ request URL ] retain ];
// Check to see what protocol/scheme the requested URL is.
if ( ( [ [ requestURL scheme ] isEqualToString: @"http" ]
|| [ [ requestURL scheme ] isEqualToString: @"https" ] )
&& ( navigationType == UIWebViewNavigationTypeLinkClicked ) ) {
[webview loadRequest:[NSURLRequest requestWithURL:requestURL]];
return YES;// 返回YES会改变当前Webview的内容，如果是NO就不改变
}
[ requestURL release ];
return YES;
}
4.当UIWebview请求结束时，如果有服务器返回的东西，可以放在返回的URL里面
- (void)webViewDidFinishLoad:(UIWebView *)webView{
NSString *currentURL = self.wb.request.URL.absoluteString;
NSLog(@"web view finish load URL %@",currentURL);
}
5.UIWebView的透明
[newWebView setBackgroundColor:[UIColor clearColor]];
[newWebView setOpaque:NO];
[newWebView loadHTMLString:[NSString stringWithFormat:@"<html><head><style>body{background-color:transparent;}</style></head><body>%@</body></html>",HTMLContent] baseURL:[NSURL URLWithString:@""]];