ios UIWebView支持缩放

ios UIWebView支持缩放

1.定义一个宏:该宏js代码可以使加载的网页支持缩放功能

• 注意标红属性的功能
  

 #define QUOTE(...) #__VA_ARGS__
const char *webViewHeightJSString = QUOTE(
                                          var viewportmeta = document.querySelector('meta[name="viewport"]');
                                          if (viewportmeta) {
                                              viewportmeta.content = 'width=device-width, initial-scale=1.0,      minimum-scale=1.0, maximum-scale=4.0, user-scalable=yes';
                                          }
                                          );
#undef QUOTE

2.在webview成功加载后,执行该段js代码

[webView stringByEvaluatingJavaScriptFromString:[NSString stringWithUTF8String:webViewHeightJSString]];