获取contentsize会有问题

[geekGetup]

    dispatch_async(dispatch_get_main_queue(), ^{
        swself.htmlView.layout = htmlLayout;
        [LWActiveIncator hideInViwe:swself];
        NSLog(@"%f======%f",self.htmlView.contentSize.height,self.htmlView.contentSize.width);
    });

在这里获取contentsize与实际的contentsize不同