一、添加头部视图
self.headView =[ [UIView alloc]initWithFrame:CGRectMake(0,-headHeight,RHScreenW,headHeight)];
self.webView.scrollView.contentInset = UIEdgeInsetsMake(headHeight,0,0,0);
[self.webView.scrollVIew addSubView:self.headView];
二、添加尾部视图
先创建尾部视图
_footerView = [[UIView alloc]initWithFrame:CGRectMake(0,0, RHScreenW,bottomHeight)];
self.webView.scrollView.contentInset = UIEdgeInsetsMake(0,0,bottomHeight,0);
[self.webView.scrollView addSubview:_footerView];
需要用到observer
1.添加observer
[_webView addObserver:self forKeyPath:@"scrollView.contentSize" options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld context:@"DJWebKitContext"];
2.移除observer
-(void)dealloc{
[self.webView removeObserver:self forKeyPath:@"scrollView.contentSize" context:@"DJWebKitContext"];
}
3.observer事件
-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary<NSKeyValueChangeKey,id> *)change context:(void *)context{
if ([keyPath isEqualToString:@"scrollView.contentSize"]){
CGFloat webViewContentHeight = self.myWebView.scrollView.contentSize.height;
// NSLog(@"webViewContentHeight:%f",webViewContentHeight);
CGRect frame = self.footerView.frame;
frame.origin.y = webViewContentHeight;
self.footerView.frame = frame;
}
}
望此文对您有帮助，谢谢阅读。
