无法将按钮链接到EXIT图标

Question

我正在学习如何创建unwind segue。我创建了两个VC，“ViewoController”和“MessageViewController”。第一个包含一个按钮，而后者嵌入在NavigationController中，它有两个barButtons“取消”和“保存”。

据我所知，要创建展开segue，“MessageViewController”中的“取消”和/或“保存”按钮必须链接到其ViewController中的“MessageViewController”中的EXIT图标。

我遇到的问题是，当我无法将barButton链接到EXIT图标

时

请让我知道如何将barBurron链接到EXIT图标，以便将方法“backToViewController”称为

viewController.m

#import "ViewController.h"
#import "MessageViewController.h"

@interface ViewController ()

@property (strong, nonatomic) IBOutlet UIButton *buttonNext;

@end

@implementation ViewController

- (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.
}

 -(void) backToViewController:(UIStoryboardSegue *)segue {

 }

 @end

messageViewController ：

 #import "MessageViewController.h"
 #import "ViewController.h"

 @interface MessageViewController ()

 @property (strong, nonatomic) IBOutlet UIBarButtonItem    
 *barButtonSave;

 @property (strong, nonatomic) IBOutlet UIBarButtonItem   
 *barButtonCancel;

 @property (strong, nonatomic) IBOutlet UITextField 
 *textFieldMessage;
 @end

 @implementation MessageViewController

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

 - (void)didReceiveMemoryWarning {
 [super didReceiveMemoryWarning];
 // Dispose of any resources that can be recreated.
 }

Answer 1

您的方法签名不太正确。为了让Xcode识别出它用作退出/展开搜索，它需要返回IBAction。

将其更改为：

- (IBAction) backToViewController:(UIStoryboardSegue *)segue;

应该解决你的问题。