NSAlert - 添加的按钮没有以正确的顺序出现

Question

我试图用2个按钮创建一个NSAlert。

let a = NSAlert() 
    a.messageText = "Do you want go to A or B?"    
    a.alertStyle = .informational 
    a.addButton(withTitle: "Yes") 
    a.addButton(withTitle: "No") 
    a.beginSheetModal(for: self.view.window!, completionHandler: { (modalResponse) -> Void in 
    if modalResponse == NSAlertFirstButtonReturn { // do stuff} 

问题是按钮NoYes之前Appers和第二个按钮似乎preselected.Why会出现这种情况？

我需要这些按钮按照它们的添加顺序出现，并且没有预先选择按钮。通过将第一个 “否” 按钮

Answer 1

• 固定的命令，然后加上 “是” 通过设置keyEquivalent可以

• 禁用预选 “”

  let alert = NSAlert() 
  alert.messageText = "Do you want go to A or B?" 
  alert.alertStyle = .informational 
  alert.addButton(withTitle: "No") 
  alert.addButton(withTitle: "Yes") 
  alert.buttons[0].keyEquivalent = "" 
  ...