iOS中WKWebView仿微信加载进度条

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 *)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))];
}

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持考高分网。