注意:如果html中包含图片链接则预估不准确.
+ (NSStringDrawingOptions)stringDrawingOptions{
return NSStringDrawingUsesLineFragmentOrigin | NSStringDrawingUsesFontLeading;
}
*options参数由于在swift中没找到正确的写法,所以我是oc类中定义了实现options多选的方法
do{
let htmlString = contentArry[0] as! String
let attributedStr = try NSMutableAttributedString(data: htmlString.dataUsingEncoding(NSUnicodeStringEncoding,allowLossyConversion: true)!, options: [NSDocumentTypeDocumentAttribute: NSHTMLTextDocumentType], documentAttributes: nil)
let options : NSStringDrawingOptions = H5WebView.stringDrawingOptions()
attributedStr.addAttribute(NSDocumentTypeDocumentAttribute, value:UIFont.systemFontOfSize(16), range:NSMakeRange(0, attributedStr.length))
let rect = attributedStr.boundingRectWithSize(CGSizeMake(MAIN_SCREEN_WIDTH-60, 250), options: options, context: nil)//UsesLineFragmentOrigin
let htmlHeight = CGRectGetHeight(rect)
return htmlHeight
}catch let error as NSError {
yqLog(error.localizedDescription)
return 160
}catch {//加入一个空的catch，用于关闭catch。否则会报错：Errors thrown from here are not handled because the enclosing catch is not exhaustive
return 160
}
```
*后期有空的时候我会描述一个昨天填的坑:在tableView自定义cell用使用webView加载html,利用webView预加载获取webView的高,适配cell的高.
