我在NSTableCellView中有一个NSTextField，我想要一个事件告诉我当我的NSTextField有关于禁用几个按钮的焦点时，我发现了这个方法：
-(void)controlTextDidBeginEditing:(NSNotification *)obj{
NSTextField *textField = (NSTextField *)[obj object];
if (textField != _nombreDelPaqueteTextField) {
[_nuevaCuentaActivoButton setEnabled:FALSE];
[_nuevaCuentaPasivoButton setEnabled:FALSE];
[_nuevaCuentaIngresosButton setEnabled:FALSE];
[_nuevaCuentaEgresosButton setEnabled:FALSE];
}
}
但它会在我的文本字段开始编辑时触发，因为这样说，我希望在我关注textField时禁用按钮，而不是在我已经开始编辑时
编辑：根据Joshua Nozzi的帮助我的代码，它仍然无法正常工作
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
#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
上#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
在可视化编辑器中说，重要的是，我已将所有NSTextFields更改为MyNSTextField类，并将委托设置为我的文件所有者（EdicionDeCuentasWC）
答案 0 :(得分：3)
我有一个自定义NSTextField子类，它会覆盖-becomeFirstResponder和-resignFirstResponder。其-cellView属性要求符合声明-textDidBecome/ResignFirstResponder:(NSTextField *)sender的协议，但它足以为您提供一般概念。可以轻松修改它以发布您的控制器可以注册为观察者的通知。我希望这会有所帮助。
- (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;
}
答案 1 :(得分：3)
我想我已经钉了它。我尝试将NSTextFiled子类化为覆盖becomeFirstResponder()和resignFirstResponder()，但是一旦我点击它，becomeFirstResponder()就会被调用，之后会调用resignFirstResponder()。咦？但搜索字段仍然处于编辑状态，焦点仍在其中。
我发现，当您点击搜索字段时，搜索字段会成为第一响应者一次，但稍后会在某个时间准备NSText，焦点将移至NSText。< / p>
我发现在准备NSText时，它被设置为self.currentEditor()。问题是，当becomeFirstResponder()来电时，self.currentEditor()尚未设定。所以becomeFirstResponder()不是检测它焦点的方法。
另一方面，当焦点移至NSText时，会调用文本字段resignFirstResponder()，您知道吗？ self.currentEditor()已设定。所以，现在是时候告诉它的代表那个文本字段了。
接下来，如何检测搜索字段何时丢失它的焦点。再次，它是关于NSText。然后你需要听NSText委托的方法，如textDidEndEditing()，并确保你让它的超类来处理方法，看看self.currentEditor()是否无效。如果是这种情况，NSText会失去它的焦点并告诉文本字段的代表。
我提供了一个代码，实际上是NSSearchField子类来做同样的事情。同样的原则也适用于NSTextField。
protocol ZSearchFieldDelegate: NSTextFieldDelegate {
func searchFieldDidBecomeFirstResponder(textField: ZSearchField)
func searchFieldDidResignFirstResponder(textField: ZSearchField)
}
class ZSearchField: NSSearchField, NSTextDelegate {
var expectingCurrentEditor: Bool = false
// When you clicked on serach field, it will get becomeFirstResponder(),
// and preparing NSText and focus will be taken by the NSText.
// Problem is that self.currentEditor() hasn't been ready yet here.
// So we have to wait resignFirstResponder() to get call and make sure
// self.currentEditor() is ready.
override func becomeFirstResponder() -> Bool {
let status = super.becomeFirstResponder()
if let _ = self.delegate as? ZSearchFieldDelegate where status == true {
expectingCurrentEditor = true
}
return status
}
// It is pretty strange to detect search field get focused in resignFirstResponder()
// method. But otherwise, it is hard to tell if self.currentEditor() is available.
// Once self.currentEditor() is there, that means the focus is moved from
// serach feild to NSText. So, tell it's delegate that the search field got focused.
override func resignFirstResponder() -> Bool {
let status = super.resignFirstResponder()
if let delegate = self.delegate as? ZSearchFieldDelegate where status == true {
if let _ = self.currentEditor() where expectingCurrentEditor {
delegate.searchFieldDidBecomeFirstResponder(self)
// currentEditor.delegate = self
}
}
self.expectingCurrentEditor = false
return status
}
// This method detect whether NSText lost it's focus or not. Make sure
// self.currentEditor() is nil, then that means the search field lost its focus,
// and tell it's delegate that the search field lost its focus.
override func textDidEndEditing(notification: NSNotification) {
super.textDidEndEditing(notification)
if let delegate = self.delegate as? ZSearchFieldDelegate {
if self.currentEditor() == nil {
delegate.searchFieldDidResignFirstResponder(self)
}
}
}
}
您需要将NSSerachField更改为ZSearchField，并且您的客户端类必须符合ZSearchFieldDelegate而不是NSTextFieldDelegate。这是一个例子。当用户单击搜索字段时，它会扩展它的宽度，当您单击其他位置时，搜索字段会丢失它的焦点并缩小其宽度，方法是更改Interface Builder设置的NSLayoutConstraint值。
class MyViewController: NSViewController, ZSearchFieldDelegate {
// [snip]
@IBOutlet weak var searchFieldWidthConstraint: NSLayoutConstraint!
func searchFieldDidBecomeFirstResponder(textField: ZSearchField) {
self.searchFieldWidthConstraint.constant = 300
self.view.layoutSubtreeIfNeeded()
}
func searchFieldDidResignFirstResponder(textField: ZSearchField) {
self.searchFieldWidthConstraint.constant = 100
self.view.layoutSubtreeIfNeeded()
}
}
这可能取决于操作系统的行为，我尝试了El Capitan 10.11.4，并且它有效。
代码也可以从Gist复制。 https://gist.github.com/codelynx/aa7a41f5fd8069a3cfa2
答案 2 :(得分：1)
以防万一，与@sam的思想略有不同的是，我们可以观察到NSWindow.firstResponder属性本身，根据文档它是KVO兼容的。然后将其与textField或textField.currentEditor()进行比较，以确定该字段是否聚焦。
答案 3 :(得分：0)
我在macrumors forums上找到了以下代码。
似乎有效。
- (BOOL)isTextFieldInFocus:(NSTextField *)textField
{
BOOL inFocus = NO;
inFocus = ([[[textField window] firstResponder] isKindOfClass:[NSTextView class]]
&& [[textField window] fieldEditor:NO forObject:nil]!=nil
&& [textField isEqualTo:(id)[(NSTextView *)[[textField window] firstResponder]delegate]]);
return inFocus;
}