在多个控制器中保持相同的视图

Question

我目前正在开发一个在布局底部有三个按钮的应用程序（出于自定义原因，我无法使用TabBar控制器或分段控制）。

当我单击其中一个按钮时，新视图应显示并继承按钮栏及其状态（按钮可处于选定或未选定状态）。

我对iOS开发完全不熟悉，所以我尝试遵循本指南（http://www.thinkandbuild.it/working-with-custom-container-view-controllers/），但问题是当我点击一个按钮时，子视图没有出现。

ContainerViewController.h

@interface ContainerViewController : UIViewController

        @property (weak, nonatomic) IBOutlet UIButton *firstButton;
        @property (weak, nonatomic) IBOutlet UIButton *secondButton;
        @property (weak, nonatomic) IBOutlet UIButton *thirdButton;
        @property (weak, nonatomic) IBOutlet UIView *detailView;

        - (IBAction)click:(id)sender;

    @end

ContainerViewController.m

#import "ContainerViewController.h"
#import "FirstViewController.h"

@interface ContainerViewController ()
@property UIContainerViewController  *currentDetailContainerViewController;
@end

@implementation ContainerViewController
@synthesize firstButton, secondButton, thirdButton;

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}
- (IBAction)click:(id)sender
{
    // switch buttons state
    // ...

    [self addDetailController:sender];
}

- (void)presentDetailController:(UIContainerViewController*)detailVC{

    //0. Remove the current Detail View Controller showed
    if(self.currentDetailContainerViewController){
        [self removeCurrentDetailContainerViewController];
    }

    //1. Add the detail controller as child of the container
    [self addChildContainerViewController:detailVC];

    //2. Define the detail controller's view size
    detailVC.view.frame = [self frameForDetailController];

    //3. Add the Detail controller's view to the Container's detail view and save a reference to the detail View Controller
    [self.detailView addSubview:detailVC.view];
    self.currentDetailContainerViewController = detailVC;

    //4. Complete the add flow calling the function didMoveToParentContainerViewController
    [detailVC didMoveToParentContainerViewController:self];

}


- (void)removeCurrentDetailContainerViewController{

    //1. Call the willMoveToParentContainerViewController with nil
    //   This is the last method where your detailContainerViewController can perform some operations before neing removed
    [self.currentDetailContainerViewController willMoveToParentContainerViewController:nil];

    //2. Remove the DetailContainerViewController's view from the Container
    [self.currentDetailContainerViewController.view removeFromSuperview];

    //3. Update the hierarchy"
    //   Automatically the method didMoveToParentContainerViewController: will be called on the detailContainerViewController)
    [self.currentDetailContainerViewController removeFromParentContainerViewController];
}

- (CGRect)frameForDetailController{
    CGRect detailFrame = self.detailView.bounds;

    return detailFrame;
}

- (void)addDetailController:(id)sender {
    FirstViewController *detailVC = [[FirstViewController alloc]initWithString:@"First view"];

    [self presentDetailController:detailVC];

}




@end

FirstViewController.h

#import <UIKit/UIKit.h>
@class ContainerViewController;

@interface FirstViewController : UIViewController
@property (weak, nonatomic) IBOutlet UILabel *label;

- (id)initWithString:(NSString*)string;

@end

FirstViewController.m

#import "FirstViewController.h"

@interface FirstViewController (){
    NSString *text;
}
@end

@implementation FirstViewController

- (id)initWithString:(NSString*)string {
    self = [super init];

    if(self){
        text = string;
    }

    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.label.text = text;

}


@end