使用 Swift 创建 NSAlert [英] Create an NSAlert with Swift

问题描述

我有在 Objective-C 中创建的代码和 NSAlert，但我现在想在 Swift 中创建它.

I have the code to create and NSAlert in Objective-C but I would now like to create it in Swift.

警报用于确认用户想要删除文档.

The alert is to confirm that the user would like to delete a document.

我想要删除"按钮然后运行删除功能，而取消"按钮只是为了消除警报.

I would like the "delete" button to then run the delete function and the "cancel" one just to dismiss the alert.

我怎样才能用 Swift 写这个?

How can I write this in Swift?

NSAlert *alert = [[[NSAlert alloc] init] autorelease];
[alert addButtonWithTitle:@"Delete"];
[alert addButtonWithTitle:@"Cancel"];
[alert setMessageText:@"Delete the document?"];
[alert setInformativeText:@"Are you sure you would like to delete the document?"];
[alert setAlertStyle:NSWarningAlertStyle];
[alert beginSheetModalForWindow:[self window] modalDelegate:self didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:) contextInfo:nil];

推荐答案

beginSheetModalForWindow:modalDelegate 在 OS X 10.10 Yosemite 中已弃用.

beginSheetModalForWindow:modalDelegate is deprecated in OS X 10.10 Yosemite.

Swift 2

func dialogOKCancel(question: String, text: String) -> Bool {
    let alert: NSAlert = NSAlert()
    alert.messageText = question
    alert.informativeText = text
    alert.alertStyle = NSAlertStyle.WarningAlertStyle
    alert.addButtonWithTitle("OK")
    alert.addButtonWithTitle("Cancel")
    let res = alert.runModal()
    if res == NSAlertFirstButtonReturn {
        return true
    }
    return false
}

let answer = dialogOKCancel("Ok?", text: "Choose your answer.")

这会根据用户的选择返回 true 或 false.

This returns true or false according to the user's choice.

NSAlertFirstButtonReturn 表示添加到对话框的第一个按钮，这里是OK"按钮.

NSAlertFirstButtonReturn represents the first button added to the dialog, here the "OK" one.

Swift 3

func dialogOKCancel(question: String, text: String) -> Bool {
    let alert = NSAlert()
    alert.messageText = question
    alert.informativeText = text
    alert.alertStyle = NSAlertStyle.warning
    alert.addButton(withTitle: "OK")
    alert.addButton(withTitle: "Cancel")
    return alert.runModal() == NSAlertFirstButtonReturn
}

let answer = dialogOKCancel(question: "Ok?", text: "Choose your answer.")

Swift 4

我们现在将枚举用于警报的样式和按钮选择.

We now use enums for the alert's style and the button selection.

func dialogOKCancel(question: String, text: String) -> Bool {
    let alert = NSAlert()
    alert.messageText = question
    alert.informativeText = text
    alert.alertStyle = .warning
    alert.addButton(withTitle: "OK")
    alert.addButton(withTitle: "Cancel")
    return alert.runModal() == .alertFirstButtonReturn
}

let answer = dialogOKCancel(question: "Ok?", text: "Choose your answer.")

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