Question

我有一个简单的程序，您可以在文本字段中键入文本，点击确定按钮，并使用输入的文本更新标签。

当我按下OK按钮，按下背景中覆盖整个视图的大按钮，或者按下键盘上的返回按钮时，我希望iPhone键盘消失。我一直在尝试使用

[textField resignFirstResponder]

方法，但它不起作用。程序编译得很好，但是当从这些事件中的任何一个调用此方法时，它会停止，并且我收到一条消息：

线程1：信号SIGABRT“

我做错了什么？

    #import "ViewController.h"

    @interface ViewController ()



    @end

    @implementation ViewController

    @synthesize txtName;
    @synthesize lblMessage;

    - (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)doSomething:(UIButton *)sender
    {
        [txtName resignFirstResponder];

        NSString *msg = [[NSString alloc] initWithFormat:@"Hello, %@", txtName.text];
        [lblMessage setText:msg];

        //[msg release];
    }

    - (IBAction)makeKeyboardGoAway:(UIButton *)sender
    {
        [txtName resignFirstResponder];
    }

    - (BOOL)textFieldShouldReturn:(UITextField *)textField
    {
        [textField resignFirstResponder];
        return YES;
    }

    @end

以下是头文件：

    #import <UIKit/UIKit.h>

    @interface ViewController : UIViewController

    @property (weak, nonatomic) IBOutlet UITextField *txtName;
    @property (weak, nonatomic) IBOutlet UILabel *lblMessage;

    - (IBAction)doSomething:(UIButton *)sender;
    - (IBAction)makeKeyboardGoAway:(UIButton *)sender;
    @end

嗯，我得到了它的工作，但我仍然不明白我得到的错误信息。这是适用于我的代码。

部首：

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
{
    IBOutlet UITextField *txtName;
    IBOutlet UILabel *lblMessage;
}
@property (nonatomic, retain) IBOutlet UITextField *txtName;
@property (nonatomic, retain) IBOutlet UILabel *lblMessage;

- (IBAction)doSomething;
- (IBAction)makeKeyboardGoAway;

@end

实现：

#import "ViewController.h"

@implementation ViewController

@synthesize txtName;
@synthesize lblMessage;

- (IBAction)doSomething
{
    [txtName resignFirstResponder];

    NSString *msg = [[NSString alloc] initWithFormat:@"Hello, %@",
                     txtName.text];
    [lblMessage setText:msg];
    //[msg release];
}

- (IBAction) makeKeyboardGoAway
{
    [txtName resignFirstResponder];
}

- (BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [textField resignFirstResponder];
    return YES;
}


- (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.
}

@end

Answer 1

单击“确定”按钮时调用此方法。

[self.view endEditing:YES];

Answer 2

可能不是resingFirstResponder事......

试一试：

创建名为takeKeyboardAway的方法：

-(void)takeKeyboardAway{[sender resingFirstResponder];}
然后随时调用它：

[self takeKeyboardAway];

Answer 3

这很有效....如果所有内容与此相符，那么它可能是您代码中的其他内容....

...还要确保所有对象都正确链接（VC到TextField和Button ....按钮回到VC）......这也可能导致崩溃

·H

@interface ViewController : UIViewController {

   IBOutlet UIButton *button;
   IBOutlet UITextField *textfield;
   IBOutlet UILabel *label;
   NSString *string;
}

-(IBAction)dismiss:(id)sender;


@property (nonatomic, retain)UIButton *button;
@property (nonatomic, retain)UITextField *textfield;
@property (nonatomic, retain)UILabel *label;

的.m

@synthesize textfield, button, label;

-(IBAction)dismiss:(id)sender {
[textfield resignFirstResponder];
string = [NSString stringWithFormat:@"Hello %@", textfield.text];
[label setText:string];
}

完成编辑文本字段后如何关闭键盘

3 个答案: