判断是否所有控件都能获得焦点（即成为第一响应者）
Determine whether all controls can get focus (i.e. become first responder)
我需要检测是否有任何 NSControl，例如 NSButton，可以通过使用 Tab 键获得焦点。
如果用户在键盘/快捷方式/键盘/"Change the way Tab moves focus"下的系统偏好设置中启用了该选项，则可以。
更具体地说，我喜欢将 NSButton 作为第一响应者，但前提是 "all controls can get focus" 模式已启用。也许我可以询问控件是否接受 firstReponder 状态？
我尝试在按钮上调用 acceptsFirstResponder，但是 returns YES 即使它不能通过使用 Tab 键成为 firstReponder，所以这不是正确的方法。
canBecomeKeyView 是您正在寻找的property/method。
来自Cocoa Event Handling Guide, Keyboard Interface Control
The acceptsFirstResponder method controls whether a responder accepts first responder status when its window asks it to (that is, when makeFirstResponder: is called with the responder as the parameter). The canBecomeKeyView method controls whether the Application Kit allows tabbing to a view. It calls acceptsFirstResponder, but it also checks for other information before determining the value to return, such as whether the view is hidden and whether full keyboard access is on.
我需要检测是否有任何 NSControl，例如 NSButton，可以通过使用 Tab 键获得焦点。
如果用户在键盘/快捷方式/键盘/"Change the way Tab moves focus"下的系统偏好设置中启用了该选项，则可以。
更具体地说，我喜欢将 NSButton 作为第一响应者，但前提是 "all controls can get focus" 模式已启用。也许我可以询问控件是否接受 firstReponder 状态？
我尝试在按钮上调用 acceptsFirstResponder，但是 returns YES 即使它不能通过使用 Tab 键成为 firstReponder，所以这不是正确的方法。
canBecomeKeyView 是您正在寻找的property/method。
来自Cocoa Event Handling Guide, Keyboard Interface Control
The acceptsFirstResponder method controls whether a responder accepts first responder status when its window asks it to (that is, when makeFirstResponder: is called with the responder as the parameter). The canBecomeKeyView method controls whether the Application Kit allows tabbing to a view. It calls acceptsFirstResponder, but it also checks for other information before determining the value to return, such as whether the view is hidden and whether full keyboard access is on.