关闭窗口前的Objective-C确认

Question

我想向用户寻求确认他想要关闭唯一的窗口以及整个应用程序

到目前为止我有这个:

- (BOOL)windowWillClose:(id)sender{
    NSAlert *alert = [[NSAlert alloc] init];
    [alert addButtonWithTitle:@"Yes"];
    [alert addButtonWithTitle:@"No"];
    [alert setMessageText:@"Are you sure you want to quit?"];
    [alert setInformativeText:@"Quiting will stop the machine, please make sure it is back to its origin."];
    [alert setAlertStyle:NSWarningAlertStyle];
    [alert setShowsSuppressionButton:YES];
    NSInteger result = [alert runModal];

    if ( result == NSAlertFirstButtonReturn ) {
        return YES;
    } else {
        return NO;
    }
}

- (BOOL)applicationShouldTerminateAfterLastWindowClosed:(NSApplication *)sender {

     return YES;
}

窗口和应用程序关闭之前有一个ifrt,如果我删除applicationShouldTerminateAfterLastWindowClosed我的窗口关闭,没有任何反应.但是当我把它打开并把这个转发器applicationShouldTerminateAfterLastWindowClosed放在工作中但是我的窗户已经关闭了.

我也尝试过,windowShouldClose但也没用.

我在这里做错了什么想法？

Answer 1

添加一个实现该代理的委托

- (BOOL)windowShouldClose:(id)sender;

委托方法,请参见:https://developer.apple.com/library/mac/documentation/Cocoa/Reference/NSWindowDelegate_Protocol/Reference/Reference.html