如何检测NSTextField何时具有焦点或是其内容选择可可 [英] How to detect when NSTextField has the focus or is it's content selected cocoa

问题描述

我在NSTableCellView里面有一个NSTextField，我想要一个事件通知我当我的NSTextField有重点禁用几个按钮，我发现这个方法：

I have a NSTextField inside of a NSTableCellView, and I want an event which informs me when my NSTextField has got the focus for disabling several buttons, I found this method:

-(void)controlTextDidBeginEditing:(NSNotification *)obj{
    NSTextField *textField  = (NSTextField *)[obj object];

    if (textField != _nombreDelPaqueteTextField) {
        [_nuevaCuentaActivoButton   setEnabled:FALSE];
        [_nuevaCuentaPasivoButton   setEnabled:FALSE];
        [_nuevaCuentaIngresosButton setEnabled:FALSE];
        [_nuevaCuentaEgresosButton  setEnabled:FALSE];
    }
}

但它只在我的文本字段开始编辑时触发这说明，当我获得焦点在textField，而不是当我已经开始键入

but it triggers just when my textfield is begin editing as this says, I want the buttons disabled when I get the focus on the textField, not when I already started to type

EDIT：根据Joshua Nozzi收到的帮助，我的代码仍然无效。

Gonna put my code based on the help received by Joshua Nozzi, it still doesn't work

MyNSTextField.h

MyNSTextField.h

#import <Cocoa/Cocoa.h>
@class MyNSTextField;

@protocol MyNSTextFieldDelegate

@optional -(BOOL)textFieldDidResignFirstResponder:(NSTextField *)sender;
@optional -(BOOL)textFieldDidBecomeFirstResponder:(NSTextField *)sender;

@end

@interface MyNSTextField : NSTextField

@property (strong, nonatomic)           id <MyNSTextFieldDelegate> cellView;

@end

MyNSTextField.m

MyNSTextField.m

#import "MyNSTextField.h"

@implementation MyNSTextField

- (BOOL)becomeFirstResponder
{
    BOOL status = [super becomeFirstResponder];
    if (status)

        [self.cellView textFieldDidBecomeFirstResponder:self];
    return status;
}

- (BOOL)resignFirstResponder
{
    BOOL status = [super resignFirstResponder];
    if (status)
        [self.cellView textFieldDidResignFirstResponder:self];
    return status;
}

@end

在我的viewcontroller EdicionDeCuentasWC.m

on my viewcontroller EdicionDeCuentasWC.m

#import "MyNSTextField.h"


@interface EdicionDeCuentasWC ()<NSTableViewDataSource, NSTableViewDelegate, NSControlTextEditingDelegate, NSPopoverDelegate, MyNSTextFieldDelegate>
@end


@implementation EdicionDeCuentasWC
#pragma mark MyNSTextFieldDelegate
-(BOOL)textFieldDidBecomeFirstResponder:(NSTextField *)sender{
    NSLog(@"textFieldDidBecomeFirstResponder");
    return TRUE;
}

-(BOOL)textFieldDidResignFirstResponder:(NSTextField *)sender{
    NSLog(@"textFieldDidResignFirstResponder");
    return TRUE;
}
#pragma mark --
@end

重要的是在可视化编辑器中，已经将我的所有NSTextFields改为MyNSTextField类，并将委托设置为我的文件的所有者（EdicionDeCuentasWC）

it's important to say in visual editor, already changed all my NSTextFields to MyNSTextField class and set delegate to my File's Owner (EdicionDeCuentasWC)

推荐答案

我有一个自定义的 NSTextField 子类覆盖 -becomeFirstResponder 和 -resignFirstResponder 。它的 -cellView 属性需要符合声明 -textDidBecome / ResignFirstResponder：（NSTextField *）sender 给你一般的想法。它可以轻松地修改为发布通知，您的控制器可以注册为观察员。

I have a custom NSTextField subclass that overrides -becomeFirstResponder and -resignFirstResponder. Its -cellView property requires conformance to a protocol that declares -textDidBecome/ResignFirstResponder:(NSTextField *)sender but it's enough to give you the general idea. It can easily be modified to post notifications for which your controller can register as an observer. I hope this helps.

- (BOOL)becomeFirstResponder
{
    BOOL status = [super becomeFirstResponder];
    if (status)
        [self.cellView textFieldDidBecomeFirstResponder:self];
    return status;
}

- (BOOL)resignFirstResponder
{
    BOOL status = [super resignFirstResponder];
    if (status)
        [self.cellView textFieldDidResignFirstResponder:self];
    return status;
}

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