Question

我在viewcontrollerB中使用文本视图，同时在用户点击导航控制器的按钮时编辑textview，视图应弹出到viewcontrollerA

我的代码是

-(void)textFieldDidBeginEditing:(UITextField *)textField
{
     edit_TEXT = textField.text;
}

-(void) back;
{
   employer_REG_NEW *empSIGHN_UPVC = [employer_REG_NEW alloc] ;
   empSIGHN_UPVC.view_LINE = edit_TEXT;
}

我没有在viewcontrollerA中获取字符串

Answer 1

1） @IBOutlet weak var txtName：UITextField！ @IBOutlet weak var lblGetValue1：UILabel！

var str2 = String()

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

}

override func viewWillAppear(_ animated: Bool) {
    super.viewWillAppear(true)

    self.lblGetValue1.text = str2
}

@IBAction func btnPassValueAction(_ sender: Any) {

let passData = storyboard?.instantiateViewController(withIdentifier: "SecondVC") as! SecondVC

// passData.delegate = self passData.str = txtName.text！

self.navigationController?.pushViewController(passData, animated: true)
}

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

2） @IBOutlet weak var txtPassValue：UITextField！ @IBOutlet weak var lblGetValue：UILabel！

var str = String()

//var delegate : myProtocol?

override func viewDidLoad() {
    super.viewDidLoad()

    self.lblGetValue.text = str
}
@IBAction func btnSendDataAction(_ sender: Any) {

    for viewController: UIViewController in (self.navigationController?.viewControllers)!{

        if (viewController is ViewController){

            let filterData: ViewController = (viewController as? ViewController)!
            filterData.str2 = txtPassValue.text!

              self.navigationController?.popToViewController(filterData, animated: true)
        }

    }

Answer 2

在viewcontrollerB.h中创建协议

@protocol testDelegate <NSObject>

-(void)sendText:(NSString *)strText;

@end

声明属性

@property (strong,nonatomic)id<testDelegate>delegate;

在viewcontrollerB.m中的

从你传递文本到后面的viewcontrollerA写在下面

[self.delegate sendText:@"Hello"]

在viewcontrollerA中

添加Delegate方法和

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

viewcontrollerB *obj = segue.destinationViewController;
obj.delegate = self;

}

并声明委托方法

你在哪里发送文字。

阅读此链接http://www.tutorialspoint.com/ios/ios_delegates.htm

的完整详情

使用导航弹出将数据传递到另一个控制器

2 个答案: