NSAlert使用

原文：https://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/Sheets/Tasks/UsingAlertSheets.html#//apple_ref/doc/uid/20001045-61749

1，使用代码

        NSAlert *alert = [[NSAlert alloc] init];

        [alert addButtonWithTitle:@"OK"];

        [alert addButtonWithTitle:@"Cancel"];

        [alert setMessageText:@"Delete the record?"];

        [alert setInformativeText:@"Deleted records cannot be restored."];

        [alert setAlertStyle:NSWarningAlertStyle];  

        

//实现帮助主题按钮

 [alert setShowsHelp:YES];

        [alert setDelegate:self];

        [alert beginSheetModalForWindow:_window modalDelegate:self didEndSelector:@selector(alertDidEnd:returnCode:contextInfo:) contextInfo:nil];

2，selector回调函数

- (void)alertDidEnd:(NSAlert *)alert 

         returnCode:(NSInteger)returnCode

        contextInfo:(void *)contextInfo

{

    if (returnCode == NSAlertFirstButtonReturn) {

       

    }

}

3, 帮助主题

  [alert setShowsHelp:YES];   见1，

        [alert setDelegate:self];

实现代理

@interface iUIAppDelegate : NSObject <NSApplicationDelegate,NSAlertDelegate>

实现回调函数，也称代理函数

- (BOOL)alertShowHelp:(NSAlert *)alert

{

    return TRUE;

}