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<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))];
}

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。