技術標籤：iOS初學習wkwebview高度

WKWebView中圖片適應螢幕並獲取WKWebView高度

//
//初始化

• (void)initwebView:(CGRect)frame {
  if (!self.webView) {
  self.webView = [[WKWebView alloc] init];
  //以下程式碼適配大小
  NSString *jScript = @“var meta = document.createElement(‘meta’); meta.setAttribute(‘name’, ‘viewport’); meta.setAttribute(‘content’, ‘width=device-width’); document.getElementsByTagName(‘head’)[0].appendChild(meta);”;

    WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:jScript injectionTime:WKUserScriptInjectionTimeAtDocumentEnd forMainFrameOnly:YES];
    WKUserContentController *wkUController = [[WKUserContentController alloc] init];
    [wkUController addUserScript:wkUScript];
    
    WKWebViewConfiguration *wkWebConfig = [[WKWebViewConfiguration alloc] init];
    wkWebConfig.userContentController = wkUController;
    
    self.webView = [[WKWebView alloc] initWithFrame:frame configuration:wkWebConfig];
    [self addSubview:self.webView];
    
    _webView.navigationDelegate = self;
   
  

  }
  }

#pragma mark - WKNavigationDelegate
// 將html中圖片適應螢幕

• (void)webView:(WKWebView *)webView didFinishNavigation:(null_unspecified WKNavigation *)navigation {
  NSString *[email protected]“var script = document.createElement(‘script’);”
  “script.type = ‘text/javascript’;”
  "script.text = “function ResizeImages() { "
  

  “var myimg,oldwidth;”
  “var maxwidth = %f;”
  “for(i=0;i <document.images.length;i++){”
  “myimg = document.images[i];”
  “if(myimg.width > maxwidth){”
  “oldwidth = myimg.width;”
  “myimg.width = %f;”
  “}”
  “}”
  “}”;”
  “document.getElementsByTagName(‘head’)[0].appendChild(script);”;
  js=[NSString stringWithFormat:js,[UIScreen mainScreen].bounds.size.width,[UIScreen mainScreen].bounds.size.width-15];
  [self.webView evaluateJavaScript:js completionHandler:nil];
  [self.webView evaluateJavaScript:@“ResizeImages();” completionHandler:nil];

  __block CGFloat webViewHeight;

  [self.webView evaluateJavaScript:@“document.body.offsetHeight” completionHandler:^(id _Nullable result,NSError * _Nullable error) {
  //獲取頁面高度，並重置webview的frame
  webViewHeight = [result doubleValue];
  webView.height = webViewHeight;
  [self regetwebviewheight:webViewHeight];
  NSLog(@"%f",webViewHeight);
  }];

  NSLog(@“結束載入”);
  }

// 獲取頁面優化後實際高度
-(void)regetwebviewheight:(CGFloat)webViewHeight{
[self.webView setFrame:CGRectMake(0, 0, SCREEN_WIDTH, webViewHeight)];
[self.webView evaluateJavaScript:@“document.body.offsetHeight” completionHandler:^(id _Nullable result,NSError * _Nullable error) {
//獲取頁面高度
CGFloat height = [result doubleValue];
NSLog(@“頁面高度height”);
}];
}