Open last scroll position in UIWebView - ios

Question

I'm have a WebView:
func loadPage() {
let request = NSURLRequest (URL: url!)
myBrowser.loadRequest(request)
}
Which load RTF document from this URL:
var url: NSURL = NSURL(fileURLWithPath: NSBundle.mainBundle().pathForResource("Chapter1", ofType: "rtf")!)!
How can I save last scroll position to NSUserDefaults, to get it then (if user pause reading and resume it).
Or maybe other type or method to make bookmark in this case.
Note: Ive been trying this:
var myBookmark: CGPoint = CGPointMake(0, 0)
override func viewWillDisappear(animated: Bool) {
myBookmark = myBrowser.scrollView.contentOffset
}
override func viewWillAppear(animated: Bool) {
super.viewWillAppear(true)
myBrowser.scrollView.delegate = self
myBrowser.scrollView.setContentOffset(myBookmark, animated: false)
}
But it's not take any effect.
UPD1: translate my VAR name.

Answer 1

To save and retrieve your scrollview offset from NSUserDefaults, set your UIWebView's delegate and try this:
var viewLaidoutSubviews = false // <-- variable to prevent the viewDidLayoutSubviews code from happening more than once
// Save your content offset when the view disappears
override func viewWillDisappear(animated: Bool) {
var userDefaults = NSUserDefaults.standardUserDefaults()
userDefaults.setValue(NSStringFromCGPoint(myBrowser.scrollView.contentOffset), forKey: "scroll_offset")
userDefaults.synchronize()
viewLaidoutSubviews = false
}
// Retrieve and set your content offset when the view re-appears
// and its subviews are first laid out
override func viewDidLayoutSubviews() {
if (!viewLaidoutSubviews) {
// If a scroll_offset is store in NSUserDefaults, use it
var userDefaults = NSUserDefaults.standardUserDefaults()
var scrollOffset:CGPoint? = CGPointFromString(userDefaults.valueForKey("scroll_offset") as? NSString)
if let position:CGPoint = scrollOffset {
myBrowser.scrollView.delegate = self
myBrowser.scrollView.setContentOffset(position, animated: false)
}
viewLaidoutSubviews = true
}
}
And utilize you UIWebView's webViewDidFinishLoad delegate method to update the scroll offset in the case that the web view didn't finish rendering before the view laid out its subviews:
// Retrieve and set your content offset once the web view has
// finished rendering (in case it hasn't finished rendering
// by the time the view's subviews were laid out)
func webViewDidFinishLoad(webView: UIWebView) {
// If a scroll_offset is store in NSUserDefaults, use it
var userDefaults = NSUserDefaults.standardUserDefaults()
var scrollOffset:CGPoint? = CGPointFromString(userDefaults.valueForKey("scroll_offset") as? NSString)
if let position:CGPoint = scrollOffset {
myBrowser.scrollView.delegate = self
myBrowser.scrollView.setContentOffset(position, animated: true)
}
}
But note, your NSUserDefaults value will also persist between app launches unless you delete it.