WKWebview上加载进度条

下面介绍在webview中添加加载进度条的代码。具体的思路看代码一目了然😆

[self.webView addObserver:self forKeyPath:@"estimatedProgress" options:NSKeyValueObservingOptionNew context:nil];

- (void)webView:(WKWebView *)webView didStartProvisionalNavigation:(null_unspecified WKNavigation *)navigation {  

  DLOG(@"%@", webView.URL);   

  [self.progressView setProgress:.15 animated:YES];

}

// 计算wkWebView进度条

- (void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context {  

  if (object == self.newedWebView && [keyPath isEqualToString:@"estimatedProgress"]) {        

CGFloat newprogress = [[change objectForKey:NSKeyValueChangeNewKey] doubleValue];   

  if (self.progressView.hidden) self.progressView.hidden = NO;    

    [self.progressView setProgress:newprogress animated:YES];    

    if (newprogress == 1) {               

          dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(.25 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{        

        self.progressView.hidden = YES;      

      });         }    

}else{    

    [super observeValueForKeyPath:keyPath ofObject:object change:change context:context];  

  }

}

- (UIProgressView *)progressView {  

  if(!_progressView)     {  

      _progressView = [[UIProgressView alloc] initWithFrame:CGRectMake(0, self.navBar.maxY, MSWIDTH, 0)];   

    _progressView.progressViewStyle = UIProgressViewStyleBar;      

  _progressView.tintColor = RGB(218, 187, 63);    

    _progressView.trackTintColor = [UIColor clearColor];      

  [self.view addSubview:_progressView];     }    

return _progressView;

}

- (void)dealloc {

   [self.newedWebView removeObserver:self forKeyPath:@"estimatedProgress"];

}