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在 UINavigationbar 中添加完成按钮

发布于 2024-11-09 14:42:15 字数 131 浏览 0 评论 0原文

当用户触摸特定文本字段或文本视图时，如何向 UINavigationbar 添加完成按钮？

或者更好的方法是检测键盘何时显示，然后显示按钮。

我希望使用“完成”按钮来关闭键盘，就像在标准 Notes 应用程序中一样。

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财迷小姐 2024-11-16 14:42:17

您应该采用委托协议，因为我相信您在这方面具有优势。您可以这样做 -

- (void)textViewDidBeginEditing:(UITextView *)textView {
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                                target:textView
                                                                                action:@selector(resignFirstResponder)];
    self.navigationItem.rightBarButtonItem = doneButton;
    [doneButton release];
}

但如果您观察通知，您将无法知道哪个是第一响应者。当然，如果您只需要担心一个对象，那么这并不是什么大问题。

You should adopt the delegate protocol as I believe you are at an advantage there. You can do this –

- (void)textViewDidBeginEditing:(UITextView *)textView {
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                                target:textView
                                                                                action:@selector(resignFirstResponder)];
    self.navigationItem.rightBarButtonItem = doneButton;
    [doneButton release];
}

But if you were to observe the notification, you can't know which one is the first responder. Of course, it is not much of a problem if you have only one object to worry about.

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白况 2024-11-16 14:42:16

您可以尝试与此类似的操作：

- (void)textFieldDidBeginEditing:(UITextField *)textField 
{       
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                                target:self
                                                                                action:@selector(doneEditing)];
    [[self navigationItem] setRightBarButtonItem:doneButton];
    [doneButton release];
}

并且还

- (void)textViewDidBeginEditing:(UITextView *)textView 
{       
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                                target:self
                                                                                action:@selector(doneEditing)];
    [[self navigationItem] setRightBarButtonItem:doneButton];
    [doneButton release];
}

可以根据需要自定义以下内容

- (void)doneEditing {
    [[self view] endEditing:YES];
}

，然后删除 - (void)textFieldDidEndEditing:(UITextField *)textField 和 - (void) 中的按钮textViewDidEndEditing:(UITextView *)textView

只要记住设置委托即可！

You could try something similar to this:

- (void)textFieldDidBeginEditing:(UITextField *)textField 
{       
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                                target:self
                                                                                action:@selector(doneEditing)];
    [[self navigationItem] setRightBarButtonItem:doneButton];
    [doneButton release];
}

and also

- (void)textViewDidBeginEditing:(UITextView *)textView 
{       
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                                target:self
                                                                                action:@selector(doneEditing)];
    [[self navigationItem] setRightBarButtonItem:doneButton];
    [doneButton release];
}

with the following customized as you like

- (void)doneEditing {
    [[self view] endEditing:YES];
}

then remove the button in - (void)textFieldDidEndEditing:(UITextField *)textField and also in - (void)textViewDidEndEditing:(UITextView *)textView

Just remember to set up the delegates!

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