NSAlert 

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NSAlert *alert = [[NSAlert alloc] init];
    [alert addButtonWithTitle:@"Continue"];
    [alert addButtonWithTitle:@"Cancel"];
    [alert setMessageText:@"Alert"];
    [alert setInformativeText:@"content"];
    [alert setAlertStyle:NSWarningAlertStyle];
    [alert beginSheetModalForWindow:self.window completionHandler:^(NSModalResponse returnCode) {
        if (returnCode == NSAlertFirstButtonReturn) {
            [[NSApplication sharedApplication] replyToApplicationShouldTerminate:YES];
        } else {
            [[NSApplication sharedApplication] replyToApplicationShouldTerminate:NO];
        }
    }];