Swift 3无法触摸UIScroll底部的UIButton

Question

I have a problem with Xcode 8 and Swift 3 UIButton inside UI ScrollView which the UIButton can't touch/tap. The structure of storyboard like this.

View
-Scroll View
--Content View
---Content Label (dynamic long content get from API)
---Agree Button

And this lines of codes for making scroll working with the dynamic label.

override func viewDidLayoutSubviews() {
    let maxLabelWidth: CGFloat = self.contentView.frame.size.width
    let neededSize = self.contentLabel.sizeThatFits(CGSize(width: maxLabelWidth, height: CGFloat.greatestFiniteMagnitude))
    self.contentView.frame.size.height = neededSize.height+self.agreeButton.frame.size.height+300
    self.scrollView.contentSize = CGSize(width: self.view.frame.size.width, height: self.contentView.frame.size.height)
}

Everything is setup as default in the storyboard. Is there another configuration to solve this problem?

Answer 1

It is highly likely that your UIButton is not within the bounds of its superview. That is usually the problem when I see this happen. Try setting the background color of the UIButton's superview to red or something and see if the button is within the red area.