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我目前有一個UI的應用程序類似於Snapchat ScrollView。該MainViewController包含UIScroll,其中三個子ViewControllers添加爲孩子ViewControllers:偏移子ViewController的UIScrollView
override func viewDidLoad() {
super.viewDidLoad()
scrollView.contentSize = CGSizeMake((self.view.bounds.width*3 + 4), self.view.bounds.height)
self.view.addSubview(scrollView)
let view1 = UIView(frame: CGRectMake(0, 0, self.view.bounds.width, self.view.bounds.height))
scrollView.addSubview(view1)
let aVC = self.storyboard?.instantiateViewControllerWithIdentifier("One")
view1.addSubview(aVC!.view)
self.addChildViewController(aVC!)
let view2 = UIView(frame: CGRectMake((self.view.bounds.width), 0, self.view.bounds.width, self.view.bounds.height))
scrollView.addSubview(view2)
let bVC = self.storyboard?.instantiateViewControllerWithIdentifier("Two")
view2.addSubview(bVC!.view)
self.addChildViewController(bVC!)
let view3 = UIView(frame: CGRectMake(2*view.bounds.width), 0, self.view.bounds.width, self.view.bounds.height))
scrollView.addSubview(view3)
let cVC = self.storyboard?.instantiateViewControllerWithIdentifier("LocationViewController")
view3.addSubview(cVC!.view)
self.addChildViewController(cVC!)
scrollView.contentOffset = CGPointMake(self.view.frame.width, 0
}
我試圖添加按鈕,兩個中間的ViewController,這將抵消了滾動要麼向左或右視圖控制器。我知道我可以在MainViewController中使用setContentOffset(),但是我不能在子視圖控制器中調用它。 self.presentingViewController和self.parentViewController都返回nil。
什麼是調用setContentOffset()的子ViewController UIScrollView的最佳方式是什麼?