set/isEnabled accesses the ViewController's enabled state.
set/isEnabled访问ViewController的启用状态。
When it notices a change, it can look at the new selection and change its text, tool tip, and enabled state to reflect that.
当它注意到变化时，会查看新的选择并更改它的文本、工具提示和启用状态来反映这一变化。
When it notices a change, it can look at the new selection and change its text, tool tip, and enabled state to reflect that.
当它注意到变化时，会查看新的选择并更改它的文本、工具提示和启用状态来反映这一变化。
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