UIScrollView 禁用顶部反弹

Question

I have a ViewController that contains an UIScrollView and I'm trying to disable the bounce effect only on the top of the view.

I tried to add this answer in my ViewController class, which is saying to do this :

func scrollViewDidScroll(_ scrollView: UIScrollView) {
    //disable bounce only at the top of the screen
    scrollView.bounces = scrollView.contentOffset.y > 100
}

But I don't really understand what to do with this. I also tried to implement the UIScrollViewDelegate.

Nothing I tried worked.

Here is my StoryBoard and ViewController

What do I need to do in order to make it works ?

My setup :

• Swift version : 5.1.3
• Xcode version : 11.3.1
• Target iOS version : 13.2
• MacBook Pro (13-inch, 2016, Four Thunderbolt 3 Ports) MacOS Catalina 10.15.2 (19C57)

Answer 1

连接 scrollView 插座，然后尝试在viewDidLoad()函数中添加scrollView.delegate = self或添加scrollView.bounces = scrollView.contentOffset.y > 100 。

Answer 2

If you want to disable bounces of the scrollview then you can take outlet of your scrollview and can set bounces property to false in viewdidload like below,

yourScrollView.bounces = false

or you can uncheck bounces from the storyboard also!

Answer 3

try this one

func scrollViewDidScroll(scrollView: UIScrollView) {
      if scrollView.contentOffset.y < 0 {
          scrollView.contentOffset.y = 0
      }
  }

Answer 4

Okay here is the answer to my problem :

• In the viewController, add the ScrollView outlet
• In the viewDidLoad() function, add this myScrollView.delegate = self
• Make your viewController implement UIScrollViewDelegate : class MyViewController: UIViewController, UIScrollViewDelegate { ...

• Then add the following function :

  func scrollViewDidScroll(scrollView: UIScrollView) { myScrollView.bounces = myScrollView.contentOffset.y > 100 }

Answer 5

Go to Attributes Inspector. uncheck "Bounce On Scrolll"