View with two UIWebViews problems with height calculation? - ios

Question

I created a UIViewController having a view with two UIWebViews. My structure looks like this (I also use auto layout with SnapKit):
class MyIntViewController: UIViewController, UIWebViewDelegate {
private var scrollView: UIScrollView!
private var contentView: UIView!
override func viewDidLoad() {
super.viewDidLoad()
self.view.backgroundColor = UIColor.whiteColor()
setupView()
}
private func setupView() {
scrollView = UIScrollView()
self.view.addSubview(scrollView)
scrollView.snp_makeConstraints { (make) -> Void in
make.edges.equalTo(self.view)
}
contentView = UIView()
contentView.backgroundColor = UIColor.greenColor()
scrollView.addSubview(contentView)
contentView.snp_makeConstraints { (make) -> Void in
make.edges.equalTo(self.scrollView)
make.width.equalTo(self.view.bounds.width)
}
// first webView
let contentWebView1 = UIWebView()
contentWebView1.scalesPageToFit = false
contentWebView1.delegate = self
contentWebView1.scrollView.bounces = false
contentWebView1.scrollView.scrollEnabled = false
contentView.addSubview(contentWebView1)
contentWebView1.snp_makeConstraints { (make) -> Void in
make.top.equalTo(contentView.snp_top)
make.left.equalTo(self.view.snp_left)
make.right.equalTo(self.view.snp_right)
make.height.equalTo(1)
}
// second webView
let contentWebView2 = UIWebView()
contentWebView2.scalesPageToFit = false
contentWebView2.delegate = self
contentWebView2.scrollView.bounces = false
contentWebView2.scrollView.scrollEnabled = false
contentView.addSubview(contentWebView2)
contentWebView2.snp_makeConstraints { (make) -> Void in
make.top.equalTo(contentWebView1.snp_bottom)
make.left.equalTo(self.view.snp_left)
make.right.equalTo(self.view.snp_right)
make.height.equalTo(1)
make.bottom.equalTo(self.contentView.snp_bottom)
}
// load content for contentWebView1 and contentWebView2
let path: String = NSBundle.mainBundle().bundlePath
let baseURL: NSURL = NSURL.fileURLWithPath(path)!
let myFileHtml: String = "HTWML for contentWebView1""
let myFileHtmlPlusCss = MMCssHelper.appendCustomCSS(myFileHtml)
contentWebView1.loadHTMLString(myFileHtmlPlusCss, baseURL: baseURL)
let path: String = NSBundle.mainBundle().bundlePath
let baseURL: NSURL = NSURL.fileURLWithPath(path)!
let myFileHtml: String = "HTWML for contentWebView2""
let myFileHtmlPlusCss = MMCssHelper.appendCustomCSS(myFileHtml)
contentWebView2.loadHTMLString(myFileHtmlPlusCss, baseURL: baseURL)
}
// MARK: UIWebViewDelegate
func webViewDidFinishLoad(webView: UIWebView) {
let webViewContentHeight: CGFloat = webView.scrollView.contentSize.height
println("webViewDidFinishLoad webViewContentHeight: \(webViewContentHeight)")
webView.snp_updateConstraints { (make) -> Void in
make.height.equalTo(webViewContentHeight)
}
}
}
When I have only one UIWebView on the page everything works fine the content of the UIWebView is calculated correctly in webViewDidFinishLoad. The problem occurs with two UIViewViews as shown above. The console output is this:
webViewDidFinishLoad webViewContentHeight: 1.0
webViewDidFinishLoad webViewContentHeight: 17.0
You can see that one webViewContentHeight is calculated correct while the other seems to be not calculated at all.
How do I get the height of a UIWebView calculated correctly when there are more than one UIWebViews on the page?