1
我想在一个roboVM项目中定义一个观察者。为此,我使用关键值观察器功能。这里是我的代码:Key-Value Observing和RoboVM
button.setTitle("Click me!", UIControlState.Normal);
button.addOnTouchUpInsideListener(new UIControl.OnTouchUpInsideListener() {
@Override
public void onTouchUpInside(UIControl control, UIEvent event) {
button.setTitle("Click #" + (++clickCount), UIControlState.Normal);
}
});
Foundation.log("title: " + button.getKeyValueCoder().getValue("title"));
button.addKeyValueObserver("title", new NSKeyValueObserver() {
@Override
public void observeValue(String keyPath, NSObject object, NSKeyValueChangeInfo change) {
Foundation.log("2");
}
});
这将记录下面一行: 标题:空
当单击该按钮标题会在屏幕上进行更改,但观察者将永远不会被调用。任何想法在代码中有什么错误?