【发布时间】：2018-01-29 15:00:12
【问题描述】：
我有一个 UIPageViewController 有两个 UIViewControllers 作为孩子。我希望用户能够在子视图之间进行分页，但我也希望能够自动调用页面。
我已经尽我所能尝试了使用 setViewControllers 的每一种排列方式，但它们都不能在程序控制下推进页面。
我觉得我必须在这里遗漏一些基本的东西，但我看不到它。
这是代码。
import UIKit
import Alamofire
import SwiftyJSON
import SVProgressHUD
class auiPrefsPageViewController: UIPageViewController, UIPageViewControllerDataSource, UIPageViewControllerDelegate {
lazy var auiPrefsControllers: [UIViewController] = {
return [self.auiPrefsControllerInstance(name: "auiURLPrefs"), self.auiPrefsControllerInstance(name: "auiCredentialsPrefs")]
}()
private func auiPrefsControllerInstance(name: String) -> UIViewController {
return UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: name)
}
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerBefore viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = auiPrefsControllers.index(of: viewController) else {
return nil
}
let previousIndex = viewControllerIndex - 1
guard previousIndex >= 0 else {
return nil
}
guard auiPrefsControllers.count > previousIndex else {
return nil
}
return auiPrefsControllers[previousIndex]
}
public func pageViewController(_ pageViewController: UIPageViewController, viewControllerAfter viewController: UIViewController) -> UIViewController? {
guard let viewControllerIndex = auiPrefsControllers.index(of: viewController) else {
return nil
}
let nextIndex = viewControllerIndex + 1
guard nextIndex < auiPrefsControllers.count else {
return nil
}
guard auiPrefsControllers.count > nextIndex else {
return nil
}
return auiPrefsControllers[nextIndex]
}
public func presentationCount(for pageViewController: UIPageViewController) -> Int {
return auiPrefsControllers.count
}
public func presentationIndex(for pageViewController: UIPageViewController) -> Int {
guard let firstViewController = viewControllers?.first, let firstViewControllerIndex = auiPrefsControllers.index(of: firstViewController) else {
return 0
}
return firstViewControllerIndex
}
override func viewDidLoad() {
super.viewDidLoad()
self.dataSource = self
self.delegate = self
if let vc1 = auiPrefsControllers.first {
setViewControllers([vc1], direction: .forward, animated: true, completion: nil)
}
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
for view in self.view.subviews {
if view is UIScrollView {
view.frame = UIScreen.main.bounds
} else {
view.backgroundColor = UIColor.clear
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func auiPrefsGoNext() {
let controller = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "auiCredentialsPrefs")
setViewControllers([controller], direction: .forward, animated: true, completion: nil)
}
public func obtainPrimaryURL(mCode: String) {
SVProgressHUD.show()
let rString = "ImaURLthatcantbepublic?aparam=" + mCode
Alamofire.request(rString).responseJSON { response in
if let result = response.result.value {
SVProgressHUD.dismiss()
let json = JSON(result)
if(json["message"] == "ok") {
let mURL: String = json["awhURL"].string!
let mAPI: String = json["apiURL"].string!
// save URLs
let sState = auiCoreDataHandler.saveBaseURL(baseURL: mURL)
if (!sState) {
let sState = auiCoreDataHandler.saveBaseURL(baseURL: "")
}
self.auiPrefsGoNext()
} else {
// handle a return error
SVProgressHUD.dismiss()
// some actual error handling here
}
}
}
}
从这里可以看出，两个重要的位是函数 gainPrimaryURL 和 auiPrefsGoNext。第一个出去并获取一些数据并存储它，然后通过调用 auiPrefsGoNext 尝试前进到下一页。就在这里，我几天来一直在绞尽脑汁并尝试一种又一种方法。底线是它不会引发任何错误，但不会进入下一页。
【问题讨论】：
标签： ios swift uikit uipageviewcontroller