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
github代码仓库上存放的Demo
为页面添加UIProgressView属性
@property (nonatomic, strong) WKWebView *mywebView;@property (nonatomic, strong) UIProgressView *progressView;//设置加载进度条
懒加载UIProgressView
-(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
[_mywebView addObserver:self forKeyPath:NSStringFromSelector(@selector(estimatedProgress)) options:0 context:nil];
页面开始加载时，隐藏进度条
//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
//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
-(void)dealloc{ [self.mywebView removeObserver:self forKeyPath:NSStringFromSelector(@selector(estimatedProgress))];}
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