以编程方式将 NSComboBox 绑定到 NSArrayController

发布于 2024-12-11 17:37:20 字数 586 浏览 3 评论 0原文

我无法填充 NSComboBox。我正在尝试以编程方式将其绑定到 NSArrayController：

frequencyArrayController = [[NSArrayController alloc] initWithContent:nil];
[frequencyArrayController setManagedObjectContext:[[NSApp mainWindowDocument] managedObjectContext]];
[frequencyArrayController setEntityName:@"Frequency"];
[frequencyArrayController fetch:self];
[frequencyComboBox bind:@"contentValues" toObject:frequencyArrayController withKeyPath:@"arrangedObjects.DisplayName" options:nil];

我缺少什么？

该字段位于 NSPanel 上，应用启动时尚未打开。我正在绑定它并提前加载笔尖，这是一个问题吗？

原文

I can't populate a NSComboBox. I'm trying to bind it programmatically to an NSArrayController:

frequencyArrayController = [[NSArrayController alloc] initWithContent:nil];
[frequencyArrayController setManagedObjectContext:[[NSApp mainWindowDocument] managedObjectContext]];
[frequencyArrayController setEntityName:@"Frequency"];
[frequencyArrayController fetch:self];
[frequencyComboBox bind:@"contentValues" toObject:frequencyArrayController withKeyPath:@"arrangedObjects.DisplayName" options:nil];

What am I missing?

The field is on a NSPanel which is not open yet when the app starts. I'm binding it and loading the nib in advance, is this an issue?

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塔塔猫 2024-12-18 17:37:20

您需要告诉您的数组控制器在某个时刻获取：。

编辑：这是我用来测试的示例代码：

    arrayController = [[NSArrayController alloc] init];
    [arrayController setManagedObjectContext:self.managedObjectContext];
    [arrayController setEntityName:@"Entity"];
    [comboBox bind:@"contentValues" toObject:arrayController         
        withKeyPath:@"arrangedObjects.name" options:nil];
    [arrayController fetch:self];

    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
       NSLog(@"%@", comboBox.objectValues); 
    }];

检查您的 MOC 和 IBOutlet 是否为非零。

You need to tell your array controller to fetch: at some point.

Edit: Here's the example code I'm using to test:

    arrayController = [[NSArrayController alloc] init];
    [arrayController setManagedObjectContext:self.managedObjectContext];
    [arrayController setEntityName:@"Entity"];
    [comboBox bind:@"contentValues" toObject:arrayController         
        withKeyPath:@"arrangedObjects.name" options:nil];
    [arrayController fetch:self];

    [[NSOperationQueue mainQueue] addOperationWithBlock:^{
       NSLog(@"%@", comboBox.objectValues); 
    }];

Check that your MOC and IBOutlets are non-nil.

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