在 iOS5 中使用 UISegmentedControl 切换 ViewController答案

【问题标题】：Switching ViewControllers with UISegmentedControl in iOS5在 iOS5 中使用 UISegmentedControl 切换 ViewController
【发布时间】：2012-02-25 00:05:00
【问题描述】：

我正在尝试一些非常简单的方法，但不知何故我无法让它工作。我所要做的就是使用 UISegmentedControl 在 2 个视图控制器之间切换，例如，您可以在 App Store 应用程序的 Highlights 选项卡中看到它。

我正在使用 iOS5 和 Storyboards。

这是我的故事板系列：

所以我有一个根视图控制器和两个 UITableViews - 这两个 TableViews 我想切换。

实现文件如下所示

#import "SegmentedLocationViewController.h"
#import "PastEventsLocationViewController.h"
#import "FutureEventsLocationViewController.h"

@interface SegmentedLocationViewController()
@property (weak, nonatomic) IBOutlet UISegmentedControl *segmentedControl;
@property (strong, nonatomic) NSArray *viewControllers;
@end


@implementation SegmentedLocationViewController

@synthesize segmentedControl = _segmentedControl;
@synthesize viewControllers = _viewControllers;

- (IBAction)indexDidChangeForSegmentedControl:(UISegmentedControl*)segmentedControl
{
    NSLog(@"index: %d", segmentedControl.selectedSegmentIndex);
}

- (void)setupViewControllers
{
    PastEventsLocationViewController *pastEventsLocationViewController = [[PastEventsLocationViewController alloc] initWithStyle:UITableViewStylePlain];
    FutureEventsLocationViewController *futureEventsLocationViewController = [[FutureEventsLocationViewController alloc] initWithStyle:UITableViewStylePlain];

    self.viewControllers = [NSArray arrayWithObjects:pastEventsLocationViewController, futureEventsLocationViewController, nil];
}

- (void)setupUI
{
    [self.segmentedControl addTarget:self action:@selector(indexDidChangeForSegmentedControl:) forControlEvents:UIControlEventValueChanged];
}

// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.
- (void)viewDidLoad
{
    [super viewDidLoad];
    [self setupViewControllers];
    [self setupUI];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

@end

我可以触发 switch 事件并且可以记录当前选择的索引。但我不知道从这里去哪里。

也许有人可以将我的注意力转向某个方向...？

【问题讨论】：

你有没有想过只用不同的值重新加载 tableView？
你是对的。我现在会检查一下。我可能觉得太复杂了……

标签： ios uiviewcontroller uikit uisegmentedcontrol

【解决方案1】：

我最终使用导航控制器来实现类似的功能。

import UIKit

class BaseViewController: UIViewController {

  var currentSegmentIndex = 0

  @IBOutlet weak var segmentedControl: UISegmentedControl!

  override func viewDidLoad() {
    super.viewDidLoad()

    segmentedControl.selectedSegmentIndex = currentSegmentIndex
  }

  @IBAction func segmentedControlChanged(_ sender: Any) {
    let idx = segmentedControl.selectedSegmentIndex
    let storyboard = UIStoryboard(name: "Main", bundle: nil)
    switch idx {
    case 0:
      let vc = storyboard.instantiateViewController(
        withIdentifier: "Foo") as! FooViewController
      vc.currentSegmentIndex = 0
      navigationController?.viewControllers = [vc]
      break
    case 1:
      let vc = storyboard.instantiateViewController(
        withIdentifier: "Bar") as! BarViewController
      vc.currentSegmentIndex = 1
      navigationController?.viewControllers = [vc]
      break
    default:
      break
    }
  }
}

【讨论】：

【解决方案2】：

A 是根视图控制器，B、C 是子视图控制器。当你点击段时，添加子视图控制器。

结果

设计

代码

import UIKit

class SegmentViewController: UIViewController {

    @IBOutlet weak var containerView: UIView!

    var leftViewController: LeftViewController!
    var rightViewController: RightViewController!


    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        if let sb = storyboard {
            leftViewController = sb.instantiateViewControllerWithIdentifier("leftViewController") as! LeftViewController

            switchViewController(from: nil, to: leftViewController)
        } else {
            print("storyboard is nil")
        }
    }

    func switchViewController(from fromVC: UIViewController?, to toVC: UIViewController?) {
        if let from = fromVC {
            from.willMoveToParentViewController(nil)
            from.view.removeFromSuperview()
            from.removeFromParentViewController()
        } else {
            print("fromVC is nil")
        }

        if let to = toVC {
            self.addChildViewController(to)
            to.view.frame = CGRectMake(0, 0, containerView.frame.width, containerView.frame.height)
            self.containerView.insertSubview(to.view, atIndex: 0)
            to.didMoveToParentViewController(self)
        } else {
            print("toVC is nil")
        }
    }

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

        removeViewController()
    }

    func removeViewController() {
        if let leftVC = leftViewController {
            if let _ = leftVC.parentViewController {
                print("leftVC is using")
            } else {
                print("set leftVC = nil")
                leftViewController = nil
            }
        }

        if let rightVC = rightViewController {
            if let _ = rightVC.parentViewController {
                print("rightVC is using")
            } else {
                print("set rightVC = nil")
                rightViewController = nil
            }
        }
    }


    @IBAction func onSegmentValueChanged(sender: UISegmentedControl) {
        UIView.beginAnimations("xxx", context: nil)
        UIView.setAnimationDuration(0.4)
        UIView.setAnimationCurve(.EaseInOut)

        switch sender.selectedSegmentIndex {
        case 0:
            UIView.setAnimationTransition(.FlipFromRight, forView: self.containerView, cache: true)

            if let leftVC = leftViewController {
                switchViewController(from: rightViewController, to: leftVC)
            } else {
                if let sb = storyboard {
                    leftViewController = sb.instantiateViewControllerWithIdentifier("leftViewController") as! LeftViewController
                    switchViewController(from: rightViewController, to: leftViewController)
                } else {
                    print("storyboard is nil")
                }
            }
        default:
            UIView.setAnimationTransition(.FlipFromLeft, forView: self.containerView, cache: true)

            if let rightVC = rightViewController {
                switchViewController(from: leftViewController, to: rightVC)
            } else {
                if let sb = storyboard {
                    rightViewController = sb.instantiateViewControllerWithIdentifier("rightViewController") as! RightViewController
                    switchViewController(from: leftViewController, to: rightViewController)
                } else {
                    print("storyboard is nil")
                }
            }
        }

        UIView.commitAnimations()
    }
}

【讨论】：

【解决方案3】：

对于想要快速实现相同功能的人

import UIKit

class HomeController: UIViewController {

    var currentViewController:UIViewController?

    @IBOutlet weak var homeController: UIView!

    override func viewDidLoad() {
        super.viewDidLoad()

        let initialController:UIViewController = self.viewControllerForSegmentedIndex(0)

        self.addChildViewController(initialController)

        initialController.view.frame = self.homeController.bounds
        self.homeController.addSubview(initialController.view)
        self.currentViewController = initialController

    }

    @IBAction func segmentChanged(sender: UISegmentedControl) {

        let viewCOntroller:UIViewController = viewControllerForSegmentedIndex(sender.selectedSegmentIndex)

        self.addChildViewController(viewCOntroller)

        self.transitionFromViewController(self.currentViewController!, toViewController: viewCOntroller, duration: 0.5, options: UIViewAnimationOptions.TransitionFlipFromBottom, animations: {
            self.currentViewController?.view.removeFromSuperview()
            viewCOntroller.view.frame = self.homeController.bounds
            self.homeController.addSubview(viewCOntroller.view)

            }, completion:{ finished in

                viewCOntroller.didMoveToParentViewController(self)
                self.currentViewController?.removeFromParentViewController()
                self.currentViewController = viewCOntroller

        })

    }
    func viewControllerForSegmentedIndex(index:Int) -> UIViewController {
        var viewController:UIViewController?
        switch index {
        case 0:
            viewController = self.storyboard?.instantiateViewControllerWithIdentifier("StoryboardIdForFirstController")
            break
        case 1:
            viewController = self.storyboard?.instantiateViewControllerWithIdentifier("StoryboardIdForSecondController")
            break
        case 2:
            viewController = self.storyboard?.instantiateViewControllerWithIdentifier("StoryboardIdForThirdController")
            break
        default:
            break
        }
        return viewController!
    }
}

故事板视图

【讨论】：

【解决方案4】：

这是 Matthias Bauch 的解决方案，但还是想在 Swift 中分享它！ 编辑： 添加指向 Swift 2.0 现成演示应用程序的链接。 https://github.com/ahmed-abdurrahman/taby-segmented-control

var currentViewController: UIViewController?
@IBOutlet weak var contentView: UIView!
@IBOutlet weak var segmentedControl: UISegmentedControl!

@IBAction func switchHappeningTabs(sender: UISegmentedControl) {
    if let vc = viewControllerForSelectedSegmentIndex(sender.selectedSegmentIndex) {
        self.addChildViewController(vc)
        self.transitionFromViewController(self.currentViewController!, toViewController: vc, duration: 0.5, options: UIViewAnimationOptions.TransitionFlipFromRight, animations: {
            self.currentViewController!.view.removeFromSuperview()
            vc.view.frame = self.contentView.bounds
            self.contentView.addSubview(vc.view)
            }, completion: { finished in
                vc.didMoveToParentViewController(self)
                self.currentViewController!.removeFromParentViewController()
                self.currentViewController = vc
            }
        )        
    }
}

override func viewDidLoad() {
    super.viewDidLoad()

    if let vc = self.viewControllerForSelectedSegmentIndex(self.segmentedControl.selectedSegmentIndex) {
        self.addChildViewController(vc)
        self.contentView.addSubview(vc.view)
        self.currentViewController = vc
    }
}

func viewControllerForSelectedSegmentIndex(index: Int) -> UIViewController? {
    var vc: UIViewController?
    switch index {
    case 0:
            vc = self.storyboard?.instantiateViewControllerWithIdentifier("FooViewController") as? UIViewController
    case 1:
            vc = self.storyboard?.instantiateViewControllerWithIdentifier("BarViewController") as? UIViewController
    default:
        return nil
    }

    return vc
}

【讨论】：

非常感谢！这让我很开心:)
当然，这是我的荣幸 :)

【解决方案5】：

此代码非常适合您的目的，我将它用于我的一个新应用程序。
它使用新的 UIViewController 包含 API，允许在您自己的 UIViewController 中使用 UIViewController，而无需手动转发 viewDidAppear: 等内容的麻烦

- (void)viewDidLoad {
    [super viewDidLoad];
    // add viewController so you can switch them later. 
    UIViewController *vc = [self viewControllerForSegmentIndex:self.typeSegmentedControl.selectedSegmentIndex];
    [self addChildViewController:vc];
    vc.view.frame = self.contentView.bounds;
    [self.contentView addSubview:vc.view];
    self.currentViewController = vc;
}
- (IBAction)segmentChanged:(UISegmentedControl *)sender {
    UIViewController *vc = [self viewControllerForSegmentIndex:sender.selectedSegmentIndex];
    [self addChildViewController:vc];
    [self transitionFromViewController:self.currentViewController toViewController:vc duration:0.5 options:UIViewAnimationOptionTransitionFlipFromBottom animations:^{
        [self.currentViewController.view removeFromSuperview];
        vc.view.frame = self.contentView.bounds;
        [self.contentView addSubview:vc.view];
    } completion:^(BOOL finished) {
        [vc didMoveToParentViewController:self];
        [self.currentViewController removeFromParentViewController];
        self.currentViewController = vc;
    }];
    self.navigationItem.title = vc.title;
}

- (UIViewController *)viewControllerForSegmentIndex:(NSInteger)index {
    UIViewController *vc;
    switch (index) {
        case 0:
            vc = [self.storyboard instantiateViewControllerWithIdentifier:@"FooViewController"];
            break;
        case 1:
            vc = [self.storyboard instantiateViewControllerWithIdentifier:@"BarViewController"];
            break;
    }
    return vc;
}

我从 Ray Wenderlich 的书 iOS5 by tutorial 的第 22 章中得到了这些东西。不幸的是，我没有指向教程的公共链接。但是有一个 WWDC 2011 视频，标题为“实现 UIViewController Containment”

编辑

self.typeSegmentedControl 是您的UISegmentedControl 的出口

self.contentView 是您的容器视图的出口

self.currentViewController 只是我们用来存储我们当前使用的UIViewController 的一个属性

【讨论】：

我没有使用情节提要完成它，但是当我将您的代码与 nib 文件一起使用时，它可以工作......所以谢谢你得到我的投票；）
这个摇滚男人。 2 个月后我才发现 [self storyboard]。谢谢！！
这似乎是一个愚蠢的问题，但是当从头开始时，我会遇到诸如在“ViewController *”类型的对象上找不到此属性“typeSegmentedControl”之类的问题，我可能正在做一些愚蠢的事情我
你必须为typeSegmentedControl添加@property (UISegmentedControl)
我将vc.view.frame = self.contentView.bounds;移到了动画块之外，以避免在过渡期间子视图超出 contentView 的边界，否则会导致闪烁。

【解决方案6】：

您可以将初始视图控制器嵌入到导航控制器中。通过选择情节提要中的视图控制器，然后选择编辑器->嵌入->导航控制器来做到这一点。

在您的 indexDidChangeForSegmentedControl: 方法中，您只需将相应的视图控制器推送到导航堆栈：

- (IBAction)indexDidChangeForSegmentedControl:(UISegmentedControl*)segmentedControl
{
    [self.navigationController pushViewController:[self.viewControllers objectAtIndex:[segmentedControl.selectedIndex]] animated:YES];

}

但是当您使用情节提要时，您的方法根本没有多大意义。我不知道您是否可以使用 segue 将单个分段控制按钮连接到视图控制器。试试看吧。

【讨论】：