上一篇文章我們講述了UIMenuController的使用.這一篇講一講原生的遮蔽.
對於UITextField、UITextView、UIWebView這三個.可以直接子類化,或者是分類,然後在.m裡面重寫- (BOOL)canPerformAction:(SEL)action withSender:(id)sender然後返回NO即可.

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
	return NO;
}

但是對於WKWebView就不能這麼做了,因為WKWebView不能子類化.經過一番搜尋,發現可以用js的方法禁止.

// 禁止選擇CSS
NSString *css = @"body{-webkit-user-select:none;-webkit-user-drag:none;}";
// CSS選中樣式取消
NSMutableString *javascript = [NSMutableString string];
[javascript appendString:@"var style = document.createElement('style');"];
[javascript appendString:@"style.type = 'text/css';"];
[javascript appendFormat:@"var cssContent = document.createTextNode('%@');", css];
[javascript appendString:@"style.appendChild(cssContent);"];
[javascript appendString:@"document.body.appendChild(style);"];
// javascript注入
WKUserScript *noneSelectScript = [[WKUserScript alloc] initWithSource:javascript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
WKUserContentController *userContentController = [[WKUserContentController alloc] init];
[userContentController addUserScript:noneSelectScript];
WKWebViewConfiguration *configuration = [[WKWebViewConfiguration alloc] init];
configuration.userContentController = userContentController;
// WKWebView 初始化
WKWebView *webView = [[WKWebView alloc] initWithFrame:frame configuration:configuration];




//獲取WKWebView選中的內容
NSString *highlighted = [_webView stringByEvaluatingJavaScriptFromString:@"window.getSelection().toString();"];
 

參考資料