ios - Webview not constraining to bottom of view -

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i'm having difficulty making webview stick bottom of it's superview. i'm resizing webview based on it's content height , "grow" while being constrained against bottom marker. can see mean these 2 images (webview blacked out):

enter image description here

enter image description here

i have tried few things. i'm using resizing webview, , attempting constrain it's superview.

func webviewdidfinishload(webview: uiwebview) {     print("got here")     webview.frame.size.height = 1     webview.frame.size = webview.sizethatfits(cgsizezero)      let bottomconstraint = nslayoutconstraint(item: webview, attribute: .bottom, relatedby: .equal, toitem: webview.superview, attribute: .bottom, multiplier: 1, constant: 0)      webview.superview!.addconstraint(bottomconstraint) }

unfortunately, webview still extends down opposed up. want webview against bottom of mapview, has it's bottom @ top of tab bar. suggestions?


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