objective-c - 如何使 NSAlert 的第二个按钮成为返回按钮？

Question

我想做这样的事情NSAlert：

如您所见，“返回”按钮是第二个。我怎样才能做到这一点？
这是我用来创建我的代码的示例NSAlert，但第一个按钮获得了焦点：

NSAlert *alert = [[NSAlert alloc] init];
[alert setMessageText:@"Are you sure you want to disconnect?"];
[alert addButtonWithTitle:@"Disconnect"];
[alert addButtonWithTitle:@"Cancel"];
[alert runModal];

我想关注“取消”按钮。有任何想法吗？谢谢！

Answer 1

要更改对象NSButton内部元素的键等效项NSAlert，您必须直接访问按钮（在创建之后和之前）并使用该方法-runModal更改键等效项。-setKeyEquivalent:

例如，要将 设置Disconnect为 ESC 并将 设置Cancel为返回，您可以执行以下操作：

NSArray *buttons = [alert buttons];
// note: rightmost button is index 0
[[buttons objectAtIndex:1] setKeyEquivalent: @"\033"];
[[buttons objectAtIndex:0] setKeyEquivalent:@"\r"];

打电话之前-runModal

Answer 2

斯威夫特 4

let alert = NSAlert()
alert.messageText = question
alert.informativeText = text
alert.alertStyle = .critical
let deleteButton = alert.addButton(withTitle: "Delete")
let cancelButton = alert.addButton(withTitle: "Cancel")
deleteButton.keyEquivalent = ""
cancelButton.keyEquivalent = "\r"