iOS开发总结-获取网页高度

前言

当时觉得这挺简单的，无论是获取WKWebView的ScrollView的内容高度还是调用JS,但是后面很容易出现网页高度获取不完的情况

解决思路

KVO监听scrollView.contentSize

实现

       [self.webView addObserver:self forKeyPath:@"scrollView.contentSize" options:NSKeyValueObservingOptionNew|NSKeyValueObservingOptionOld context:@"DJWebKitContext"];

-(void)observeValueForKeyPath:(NSString *)keyPath ofObject:(id)object change:(NSDictionary *)change context:(void *)context{
    if([keyPath isEqualToString:@"scrollView.contentSize"])
    {
        CGFloat webViewContentHeight = self.webView.scrollView.contentSize.height;
        if (webViewContentHeight != 50) {
            CGRect frame = self.webView.frame;
            frame.size.height = webViewContentHeight;
            self.webView.frame = frame;
            [self.webView sizeToFit];
            self.height = self.webView.maxY + 10;
            //        刷新自身高度
            if (self.delegate && [self.delegate respondsToSelector:@selector(mouoDiaryDetailHeaderViewWebDidFinish)]) {
                [self.delegate mouoDiaryDetailHeaderViewWebDidFinish];
            }
        }
        
    }
    
}
- (void)dealloc{
    [self.webView removeObserver:self forKeyPath:@"scrollView.contentSize" context:@"DJWebKitContext"];
}