我如何告诉我的 UITextField（代码）放弃第一响应者？

发布于 2024-12-05 20:37:12 字数 1069 浏览 0 评论 0原文

我已经通过代码创建了 UITextField，没有 InterfaceBuilder。我希望按下“完成”按钮时键盘消失。代码如何知道我正在引用 UITextField 而不是其他 UITextField

首先，非常感谢。

我的代码是这样的：

-(void)viewDidLoad {
    [super viewDidLoad];
    field = [[UITextField alloc] initWithFrame:CGRectMake(30, 100, 185, 30)];
    field.adjustsFontSizeToFitWidth = YES;
    field.textColor = [UIColor blackColor];
    field.placeholder = @"Text";
    field.keyboardType = UIKeyboardTypeDefault;
    field.returnKeyType = UIReturnKeyDone;
    field.backgroundColor = [UIColor blueColor];
    field.delegate = self;
    [self.view addSubview:field];
} 

......

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

}

使用此代码，我按下“完成”按钮，但什么也没有发生。你说的是这样吗？

编辑：

我创建了两个 UITextField，就像处理前一个 UITextField 一样。但现在，对于每一行，我都这样做：

 if ([indexPath row] == 0) {
     [cell.contentView addSubview:pTextField];
 }
 else {
     [cell.contentView addSubview:pTextField];
 }

因此，使用这段代码，程序收到信号“EXC_BAD_ACCESS”。知道为什么会发生这种情况吗？

原文

I have created my UITextField by code, without InterfaceBuilder. I want the keyboard to disappear when the button "Done" is pushed. How does the code know that I am referending to an UITextField and no to other one

First, thanks a lot.

My code is like this:

-(void)viewDidLoad {
    [super viewDidLoad];
    field = [[UITextField alloc] initWithFrame:CGRectMake(30, 100, 185, 30)];
    field.adjustsFontSizeToFitWidth = YES;
    field.textColor = [UIColor blackColor];
    field.placeholder = @"Text";
    field.keyboardType = UIKeyboardTypeDefault;
    field.returnKeyType = UIReturnKeyDone;
    field.backgroundColor = [UIColor blueColor];
    field.delegate = self;
    [self.view addSubview:field];
} 

......

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

}

With this code I push the button Done and nothing happen. Is like that how you say?

Edit:

I've created two UITextField how I did with the previous one. But now, for each row I do this:

 if ([indexPath row] == 0) {
     [cell.contentView addSubview:pTextField];
 }
 else {
     [cell.contentView addSubview:pTextField];
 }

So with this code, the program received signal "EXC_BAD_ACCESS". Any idea why happen this?

分享到QQ

分享到微博

如果你对这篇内容有疑问，欢迎到本站社区发帖提问参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。

发布评论

需要登录才能够评论，你可以免费注册一个本站的账号。

路还长，别太狂 2024-12-12 20:37:12

代码如何知道我正在引用 UITextField 而不是其他 UITextField

您的 textFieldShouldReturn: 方法的 textField 参数将始终是当前活动的文本字段。

该方法必须返回一个 BOOL，您应该会收到编译器警告。请

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

注意，您当前添加文本字段的方式也在泄漏内存。您应该按照 WrightCS 的答案将其设置为属性，以便稍后参考。因此，在 viewDidLoad 的末尾：

self.myTextField = field;
[field release];

How does the code know that I am referending to an UITextField and no to other one

Your textFieldShouldReturn: method's textField parameter will always be the text field that is currently active.

The method has to return a BOOL, you should be getting compiler warnings with it as it stands. Try

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

Note that you are also currently leaking memory in the way you add the text field. You should set it as a property as per WrightCS's answer so that you can refer to it later on. So at the end of your viewDidLoad:

self.myTextField = field;
[field release];

回复收藏 0 原文

指尖上的星空 2024-12-12 20:37:12

在标题中定义文本字段，然后您可以使用以下内容：

.h

@interface MyeViewController : UIViewController <UITextFieldDelegate>
{
    UITextField * myTextField;
}
@end

.m

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [myTextField resignFirstResponder];

    /* textField here is referenced from 
       textFieldShouldReturn:(UITextField *)textField 
     */
}

Define your textField in your header, then you can use the following:

.h

@interface MyeViewController : UIViewController <UITextFieldDelegate>
{
    UITextField * myTextField;
}
@end

.m

-(BOOL)textFieldShouldReturn:(UITextField *)textField
{
    [myTextField resignFirstResponder];

    /* textField here is referenced from 
       textFieldShouldReturn:(UITextField *)textField 
     */
}

回复收藏 0 原文

惯饮孤独 2024-12-12 20:37:12

确保将以编程方式创建的 UITextField 的 delegate 设置为 self（创建该对象的视图控制器）并实现适当的 UITextFieldDelegate 方法（我认为它的 textFieldShouldReturn:）并在传递给委托方法的 textField 参数上调用该方法 resignFirstResponder （这将是您的UI 文本字段）。