switch  ([alert alertStyle]){
case  NSWarningAlertStyle:
NSLog( @"NSWarningAlertStyle" );
break ;
case  NSInformatio #import "MyObject.h" 

@implementation  MyObject

- ( IBAction )myAction:( id )sender
{
// アラートパネルを作成 
NSAlert *alert = [NSAlert alertWithMessageText: @"alertWithMessageText" 
defaultButton: @"defaultButton" 
alternateButton: @"alternateButton" 
otherButton: @"otherButton" 
informativeTextWithFormat: @"informativeTextWithFormat %@" , @"text" 
];
// ボタンを追加 
[alert addButtonWithTitle: @"add" ];
// 
[alert setDelegate:delegateObject];
// ヘルプボタンをつける 
[alert setShowsHelp: YES ];
// シートで表示 
[alert beginSheetModalForWindow:[sender window]
modalDelegate: self 
didEndSelector: @selector (endAlert)
contextInfo: nil 
];
// アラートスタイルを表示 
switch  ([alert alertStyle]){
case  NSWarningAlertStyle:
NSLog( @"NSWarningAlertStyle" );
break ;
case  NSInformationalAlertStyle:
NSLog( @"NSInformationalAlertStyle" );
break ;
case  NSCriticalAlertStyle:
NSLog( @"NSCriticalAlertStyle" );
break ;
}

}
// パネルが終わった時の処理 
-( void )endAlert
{
NSLog( @"end" );
}

@end 
nalAlertStyle:
NSLog( @"NSInformationalAlertStyle" );
break ;
case  NSCriticalAlertStyle:
NSLog( @"NSCriticalAlertStyle" );
break ;
}