Cocoa 绑定——尝试将 NSMenuItem 的状态绑定到我的自定义 BOOL
在我的 mac 应用程序中，[Model m] 是一个自定义对象，具有合成的 BOOL 属性和 ivar rollAnimations。 AnimationsItem 是一个 NSMenuItem 对象。我想将animationsItem的状态绑定到[Model m]的rollAnimations属性和ivar。双向绑定是理想的（这样改变一个属性就会改变另一个属性），但如果这很混乱（保留循环等），我会选择单向绑定，这样改变菜单项就会改变 rollAnimations财产。
这是一个代码片段。它不起作用。我缺少什么？
NSMutableDictionary *bindingOptions = [NSMutableDictionary dictionary];
NSNumber *yesNumber = [NSNumber numberWithBool:YES];
[bindingOptions setObject:yesNumber forKey:NSValidatesImmediatelyBindingOption];
[animationsItem bind:@"state" toObject:[Model m] withKeyPath:@"rollAnimations" options:bindingOptions];
In my mac app, [Model m] is a custom object with a synthesized BOOL property and ivar rollAnimations. And animationsItem is an NSMenuItem object. I want to bind the state of my animationsItem to the rollAnimations property and ivar of [Model m]. A two-way binding would be ideal (so that changing either property changes the other), but if that's messy (retain cycles and such), I'll settle for a one-way binding, such that changing the menu item changes the rollAnimations property.
Here is a code snippet. It's not working. What am I missing?
NSMutableDictionary *bindingOptions = [NSMutableDictionary dictionary];
NSNumber *yesNumber = [NSNumber numberWithBool:YES];
[bindingOptions setObject:yesNumber forKey:NSValidatesImmediatelyBindingOption];
[animationsItem bind:@"state" toObject:[Model m] withKeyPath:@"rollAnimations" options:bindingOptions];
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Cocoa 绑定参考列出了 菜单项支持的所有绑定。您想要的是
@"value"，而不是@"state"。 （这也适用于按钮 ， 顺便一提。）The Cocoa Bindings Reference lists all the bindings a menu item supports. The one you want is
@"value", not@"state". (This goes for buttons, too, by the way.)