0

我有一个简单的程序，您可以在其中在文本字段中输入文本，点击确定按钮，标签会随着输入的文本更新。

当我按下 OK 按钮、按下覆盖整个视图的背景中的大按钮或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。该程序编译得很好，但是当从这些事件中的任何一个调用此方法时，它就会停止，并且我收到一条消息：

线程 1：信号 SIGABRT"

我究竟做错了什么？

    #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

这里也是头文件：

    #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

好吧，我让它工作了，但我仍然不明白我收到的错误消息。这是对我有用的代码。

标题：

#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

执行：

#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
4

2 回答 2

0

单击确定按钮时调用此方法。

[self.view endEditing:YES];
于 2013-02-21T02:13:06.777 回答
-1

这行得通....如果一切都与此一致，则可能是您的代码中的其他内容....

...还要确保正确链接所有对象（VC 到 TextField 和 Button....Button 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;

.m

@synthesize textfield, button, label;

-(IBAction)dismiss:(id)sender {
[textfield resignFirstResponder];
string = [NSString stringWithFormat:@"Hello %@", textfield.text];
[label setText:string];
}
于 2013-02-21T00:24:23.563 回答