我有在 Objective-C 中创建和 NSAlert 的代码，但我现在想在 Swift 中创建它。
该警报旨在确认用户想要删除文档。
我想要“删除”按钮来运行删除功能，而“取消”按钮只是为了消除警报。
我怎样才能用 Swift 写这个？
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];
beginSheetModalForWindow:modalDelegate在 OS X 10.10 Yosemite 中已弃用。
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.")
这返回true or false根据用户的选择。
NSAlertFirstButtonReturn代表添加到对话框中的第一个按钮，此处为“确定”按钮。
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
我们现在使用枚举作为警报的样式and按钮选择。
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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