ios用戶端學習-WKWebView中圖檔适應螢幕并擷取WKWebView高度

WKWebView中圖檔适應螢幕并擷取WKWebView高度

//

//初始化

• (void)initwebView:(CGRect)frame {

  if (!self.webView) {

  self.webView = [[WKWebView alloc] init];

  //以下代碼适配大小

  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

// 将html中圖檔适應螢幕

• (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) {

  //擷取頁面高度，并重置webview的frame

  webViewHeight = [result doubleValue];

  webView.height = webViewHeight;

  [self regetwebviewheight:webViewHeight];

  NSLog(@"%f",webViewHeight);

  }];

  NSLog(@“結束加載”);

  }

// 擷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) {

//擷取頁面高度

CGFloat height = [result doubleValue];

NSLog(@“頁面高度height”);

}];

}