如何使用动画将一个ChildViewController推送到另一个ChildViewController

Question

我是iOS的初学者。在我的ParentViewController中，我添加了一个ChildViewController。在该控制器中，我添加了一个Next按钮。当我点击那个按钮时，我正在将First ChildViewController推向Second ChildViewController。这很好。

但在这里我在第二个ChildViewController中添加了另一个按钮。当我点击那个按钮时，我想从Second ChildViewController返回到First ChildViewController。但我的代码不能正常工作。请帮帮我

我的代码：

ParentViewController：

#import "ParentViewController.h"

@interface ParentViewController ()

@end

@implementation ParentViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.view.backgroundColor = [UIColor whiteColor];

    ChildViewController1 *ViewController1 = [self.storyboard instantiateViewControllerWithIdentifier:@"ChildViewController1"];

    ViewController1.view.frame = CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height);
    ViewController1.view.backgroundColor = [UIColor cyanColor];
    [ViewController1 willMoveToParentViewController:self];
    [self.view ViewController1.view];
    [self ViewController1];
}
@end

ChildViewController1：

#import "ChildViewController1.h"

@interface ChildViewController1 ()
{

}

@end

@implementation ChildViewController1

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (IBAction)next:(id)sender{

    ChildViewController2 *middleVC =[self.storyboard instantiateViewControllerWithIdentifier:@"ChildViewController2"];

    middleVC.view.hidden=FALSE;
    [middleVC.view setFrame:CGRectMake(self.view.frame.size.width, 0, self.view.frame.size.width, self.view.frame.size.height)];

    [self addChildViewController:middleVC];
    [self.view addSubview:middleVC.view];
    [middleVC didMoveToParentViewController:self];

    [UIView animateWithDuration:0.5 animations:^{
        [middleVC.view setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];
    }];
}

ChildViewController2：

#import "ChildViewController2.h"

@interface ChildViewController2 ()
{

}

@end

@implementation ChildViewController2

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (IBAction)back:(id)sender {

    ChildViewController2 *middleVC =[self.storyboard instantiateViewControllerWithIdentifier:@"ChildViewController2"];

    middleVC.view.hidden=FALSE;

    [middleVC.view setFrame:CGRectMake(0, 0, self.view.frame.size.width, self.view.frame.size.height)];

    [self addChildViewController:middleVC];
    [self.view addSubview:middleVC.view];
    [middleVC didMoveToParentViewController:self];

    [UIView animateWithDuration:0.5 animations:^{
        [middleVC.view setFrame:CGRectMake(self.view.frame.size.width, 0, self.view.frame.size.width, self.view.frame.size.height)];
    }];
}

在这里，当我点击后退按钮时，它不会向后推。

Answer 1

在ChildViewController2后退按钮操作中，您拥有：

 ChildViewController2 *middleVC =[self.storyboard instantiateViewControllerWithIdentifier:@"ChildViewController2"];

你的意思不是：

ChildViewController1 *middleVC =[self.storyboard instantiateViewControllerWithIdentifier:@"ChildViewController1"];