计算带有图像的UIWebView高度会给出错误的答案 [英] calculating UIWebView height with images gives wrong answer
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问题描述
我发现了如何根据其内容计算动态uiwebview高度.我的代码是:
I found how to calculate dynamic uiwebview height according to its content. My code is :
println("webViweDidFinish started")
var frame:CGRect = myWebView.frame
frame.size.height = 1
var fittingSize :CGSize = myWebView.sizeThatFits(CGSizeZero)
frame.size = fittingSize
myWebView.frame = frame
var contentsizeHeight = webView.scrollView.contentSize.height
var yCoordinateOfWebView = myWebView.frame.origin.y
var contentHeight: CGFloat = webView.scrollView.contentSize.height;
myScrollView.contentSize = CGSizeMake(self.view.frame.width, yCoordinateOfWebView + contentsizeHeight + labelAuthorOfArticle.frame.height) //
UIView.animateWithDuration(0.5, animations: {
self.heightConstraints.constant = fittingSize.height
self.myWebView.layoutIfNeeded()
self.myScrollContentView.layoutIfNeeded()
})
self.activityIndicator.stopAnimating()
如果我使用这种方法:
var height:NSString! = webView.stringByEvaluatingJavaScriptFromString("document.height;")
var heightInFloat = height.floatValue
如何将高度转换为CGFloat?如您所见，我只能将其转换为浮点型.
How to convert height to CGFloat? I can only convert it to float as you see.
问题是，当webview包含太多图像时，高度计算错误.相反，当没有图像高度时，计算正确.当我重新加载该函数时，它第二次计算正确(带有图像).这是我正在加载的字符串的内容:
The problem is that when webview has too many images the height is calculated wrong. Oppositely when there is no image height is calculated right. When I reload the function, the second time it calculates right (with images). Here is content of string that I am loading:
class func formatContentText(inout text: NSString)-> NSString{
text = text.stringByReplacingOccurrencesOfString("src=\"", withString: "src=\"http://dixinews.kz")
var deviceWidth = "300"
text = "<html><head><meta name = \"viewport\" content = \"user-scalable=no, width=" + deviceWidth + " , maximum-scale=1.0\"><style>img{max-width:100%%;height:auto !important;width:auto !important;};</style></head><body>" + text + "</body></html>"
return text
}
推荐答案
我在javascript中使用了方法.这是我的代码:
I used approach with javascript. Here is my code:
func webViewDidFinishLoad(webView: UIWebView) {
var frame:CGRect = myWebView.frame
// javascript
var height:NSString! = webView.stringByEvaluatingJavaScriptFromString("document.height;")
var heightInFloat = height.floatValue // convert to float
var heightINCGFloat = CGFloat(heightInFloat) convert to cgfloat
frame.size.height = heightINCGFloat //set heigh
myWebView.frame = frame // set frame
myWebView.scrollView.contentSize.height = myWebView.frame.height
var contentsizeHeight = webView.scrollView.contentSize.height
var yCoordinateOfWebView = myWebView.frame.origin.y
myScrollView.contentSize = CGSizeMake(self.view.frame.width, yCoordinateOfWebView + contentsizeHeight + labelAuthorOfArticle.frame.height) //
UIView.animateWithDuration(0.5, animations: {
self.heightConstraints.constant = heightINCGFloat
self.myWebView.layoutIfNeeded()
self.myScrollContentView.layoutIfNeeded()
})
self.activityIndicator.stopAnimating()
}
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