iPhone键盘，完成按钮和resignFirstResponder [英] iPhone keyboard, Done button and resignFirstResponder

问题描述

这可能是一个愚蠢的问题，但我在文档中找不到答案。弹出键盘上的完成按钮是否总是导致键盘消失？我看到很多代码在网络像这样：

This is probably a dumb question, but I can't find the answer in the docs. Did the "Done" button on the pop-up keyboard always cause the keyboard to disappear? I see a lot of code around the web like this:

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

当我按下完成按钮时，键盘弹出， code> UITextField 退出第一个响应者。

When I press the "Done" button, the keyboard pops down and the UITextField resigns first responder.

我假设按完成按钮没有使用 UITextField 到 resignFirstResponder ，但此行为在某些时候已更改。

I'm presuming that pressing the "Done" button didn't used to cause a UITextField to resignFirstResponder, but that behavior changed at some time.

我在OS 3.0 - 3.1.3上调试

I'm debugging on OS 3.0 - 3.1.3

推荐答案

我做了一个小测试项目，只有一个UITextField和此代码

I made a small test project with just a UITextField and this code

#import <UIKit/UIKit.h>
@interface TextFieldTestViewController : UIViewController
<UITextFieldDelegate>
{
    UITextField *textField;
}
@property (nonatomic, retain) IBOutlet UITextField *textField;
@end

#import "TextFieldTestViewController.h"
@implementation TextFieldTestViewController
@synthesize textField;

- (void)viewDidLoad
{
    [self.textField setDelegate:self];
    [self.textField setReturnKeyType:UIReturnKeyDone];
    [self.textField addTarget:self
                  action:@selector(textFieldFinished:)
        forControlEvents:UIControlEventEditingDidEndOnExit];
    [super viewDidLoad];
}
- (IBAction)textFieldFinished:(id)sender
{
    // [sender resignFirstResponder];
}

- (void)dealloc {
    [super dealloc];
}
@end

文本字段是未修改的 UITextField 拖到NIB上，并连接插座。

加载应用程序后，单击文本字段打开键盘。按完成按钮使文本字段失去焦点，并使键盘动画。请注意，网络上的建议是始终使用 [sender resignFirstResponder] ，但这样做没有它。

The text field is an unmodified UITextField dragged onto the NIB, with the outlet connected.
After loading the app, clicking in the text field brings up the keyboard. Pressing the "Done" button makes the text field lose focus and animates out the keyboard. Note that the advice around the web is to always use [sender resignFirstResponder] but this works without it.

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