用Swift创建一个NSAlert

我有Objective-C中创建和NSAlert的代码，但我现在想在Swift中创建它。用Swift创建一个NSAlert

该警报旨在确认用户想要删除文档。

我想“删除”按钮然后运行删除功能和“取消”一个只是为了解除警报。

如何在Swift中编写此代码？

感谢

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];

来源

2015-04-03 Tom Coomer

你可能要考虑的是'beginSheetModal（用于：completionHandler：）'是*不*过时，实际上它可能是更理想的方式来处理你的模态对话框（在一个块中）。它也会更接近老式的'didEndSelector'，它不会停止整个应用程序。 – Patru 2017-07-01 13:30:38

beginSheetModalForWindow:modalDelegate在OS X 10.10优胜美地已被弃用。

夫特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.")

这将返回根据用户的选择或truefalse。

NSAlertFirstButtonReturn代表添加到对话框的第一个按钮，这里是“OK”之一。

斯威夫特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.")

斯威夫特4

我们现在使用的警报的风格和按钮选择枚举。

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.")

来源

2015-04-03 14:00:59 Moritz

请确保'import AppKit'（至少在swift 3中） – Claude 2017-02-03 11:50:04

@Claude如果你正在发出警报，这意味着你正在制作一个Cocoa应用程序，这意味着你正在导入已经导入AppKit的Cocoa。 – Moritz 2017-02-03 12:09:00

可能我不应该从非VC类中发出警报;但我只是想要一些穷人的错误显示。这个util类没有导入除了Foundation之外的任何东西，所以我需要导入（至少它让XCode很开心）。 – Claude 2017-02-03 12:22:52

我想这可能为你工作...

let a = NSAlert() 
    a.messageText = "Delete the document?" 
    a.informativeText = "Are you sure you would like to delete the document?" 
    a.addButtonWithTitle("Delete") 
    a.addButtonWithTitle("Cancel") 
    a.alertStyle = NSAlertStyle.WarningAlertStyle 

    a.beginSheetModalForWindow(self.view.window!, completionHandler: { (modalResponse) -> Void in 
     if modalResponse == NSAlertFirstButtonReturn { 
      print("Document deleted") 
     } 
    })

来源

2016-04-30 12:26:18

用Swift创建一个NSAlert

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