为什么scrollview仍然滚动，即使它没有要滚动的contentView

Question

任何人都可以解释为什么橙色方块不在0点，我仍然可以向上和向下滚动20个像素的滚动视图吗？

导入UIKit

class MessageVC：UIViewController，UIScrollViewDelegate {

let scrollView = UIScrollView()


let messageHolder = MessageHolderVC()
let messageSender = MessageSenderVC()

override func viewDidLoad() {
    super.viewDidLoad()
    self.view.backgroundColor = UIColor.whiteColor()


    scrollView.frame = CGRectMake(0, 1, self.view.frame.width, self.view.frame.height - 2)
    scrollView.backgroundColor = UIColor.redColor()
    scrollView.pagingEnabled = true

    scrollView.contentSize = CGSizeMake(scrollView.frame.size.width * 2, scrollView.frame.size.height)
    scrollView.bounces = false

    self.view.addSubview(scrollView)


    messageHolder.view.frame = CGRectMake(0, 0, 20, 20)
    scrollView.addSubview(messageHolder.view)




}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()
    // Dispose of any resources that can be recreated.
}


/*
// MARK: - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    // Get the new view controller using segue.destinationViewController.
    // Pass the selected object to the new view controller.
}
*/

Answer 1

试试这个：在你的故事板中选择ViewController并取消选中Adjust Scroll View insets，如下所示：