设置初始ScrollView

Question

我想将“ViewController2”设置为ScrollView中的初始页面，但是更改setContentOffset(CGPointMake(0,0), animated: false)会将第一页设置为初始页面，我尝试使用不同的数字修改它，但它只是弄乱了页面，任何提示？

import UIKit

class ViewController: UIViewController {

@IBOutlet var scrollView: UIScrollView!

override func viewDidLoad() {
    super.viewDidLoad()
    scrollView.bounces = false
    scrollView.pagingEnabled = true
    scrollView.setContentOffset(CGPointMake(0,0), animated: false)
}

override func didReceiveMemoryWarning() {
    super.didReceiveMemoryWarning()

}

override func viewDidLayoutSubviews() {
    initScrollView()
}

func initScrollView(){
    let viewController1 = storyboard?.instantiateViewControllerWithIdentifier("ViewController1") as! ViewController1

    viewController1.willMoveToParentViewController(self)
    viewController1.view.frame = scrollView.bounds

    let viewController2 = storyboard?.instantiateViewControllerWithIdentifier("ViewController2") as! ViewController2

    viewController2.willMoveToParentViewController(self)
    viewController2.view.frame.size = scrollView.frame.size
    viewController2.view.frame.origin = CGPoint(x: view.frame.width, y: 0)

    let viewController3 = storyboard?.instantiateViewControllerWithIdentifier("ViewController3") as! ViewController3

    viewController3.willMoveToParentViewController(self)
    viewController3.view.frame.size = scrollView.frame.size
    viewController3.view.frame.origin = CGPoint(x: view.frame.width * 2, y: 0)

    scrollView.contentSize = CGSize(width: 3 * scrollView.frame.width, height: scrollView.frame.height)

    scrollView.addSubview(viewController3.view)
    self.addChildViewController(viewController3)
    viewController3.didMoveToParentViewController(self)

    scrollView.addSubview(viewController2.view)
    self.addChildViewController(viewController2)
    viewController2.didMoveToParentViewController(self)

    scrollView.addSubview(viewController1.view)
    self.addChildViewController(viewController1)
    viewController1.didMoveToParentViewController(self)
}}

Answer 1

尝试在vc2中取消选择滚动视图插入调整...

Answer 2

通过将scrollView.setContentOffset(CGPointMake(375,0), animated: false)放入viewDidlayoutSubViews中，它会加载下一个视图，请注意我使用的是iphone 4,7英寸屏幕，因此viewController的宽度为375.将375更改为viewController的宽度，例如你想首先加载最后一页你要添加375到375等等..

override func viewDidLayoutSubviews() {
    initScrollView()
    scrollView.setContentOffset(CGPointMake(375,0), animated: false)
}