本文实例为大家分享了WKWebView仿微信加载进度条的具体代码，供大家参考，具体内容如下
WKWebView添加了estimatedProgress属性（double类型），我们可以利用该属性来设置UIProgressView
@H_301_8@ @property (nonatomic,strong) WKWebView *mywebView; @property (nonatomic,strong) UIProgressView *progressView;//设置加载进度条懒加载UIProgressView
@H_301_8@ -(UIProgressView *)progressView{ if (!_progressView) { _progressView = [[UIProgressView alloc] initWithProgressViewStyle:UIProgressViewStyleDefault]; _progressView.frame = CGRectMake(0,64,screen_width,5); [_progressView setTrackTintColor:[UIColor colorWithRed:240.0/255 green:240.0/255 blue:240.0/255 alpha:1.0]]; _progressView.progressTintColor = [UIColor greenColor]; } return _progressView; }在初始化WKWebView时（我是在懒加载时） kvo 添加监控
@H_301_8@ [_mywebView addObserver:self forKeyPath:NSStringFromSelector(@selector(estimatedProgress)) options:0 context:nil];页面开始加载时，隐藏进度条
@H_301_8@ //开始加载 -(void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation{ //开始加载的时候，让进度条显示 self.progressView.hidden = NO; }kvo 监听进度
@H_301_8@ //kvo 监听进度 -(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{ if ([keyPath isEqualToString:NSStringFromSelector(@selector(estimatedProgress))] && object == self.mywebView) { [self.progressView setAlpha:1.0f]; BOOL animated = self.mywebView.estimatedProgress > self.progressView.progress; [self.progressView setProgress:self.mywebView.estimatedProgress animated:animated]; if (self.mywebView.estimatedProgress >= 1.0f) { [UIView animateWithDuration:0.3f delay:0.3f options:UIViewAnimationOptionCurveEaSEOut animations:^{ [self.progressView setAlpha:0.0f]; } completion:^(BOOL finished) { [self.progressView setProgress:0.0f animated:NO]; }]; } }else{ [super observeValueForKeyPath:keyPath ofObject:object change:change context:context]; } }在dealloc方法里移除监听
@H_301_8@ -(void)dealloc{ [self.mywebView removeObserver:self forKeyPath:NSStringFromSelector(@selector(estimatedProgress))]; }