在iPhone中调用某个类的SEL（选择器）？

Question

我有一个类，我在其中调用另一个类的方法（带有 SEL 参数），如下所示，

// class 1

+(CCScene *) scene
{
// 'scene' is an autorelease object.
CCScene *scene = [CCScene node];

// 'layer' is an autorelease object.
HelloWorldLayer *layer = [HelloWorldLayer node];

// add layer as a child to scene 
[scene addChild: layer];

// returns a CClayer Object
id myClassLayer = [myClass objWithBackgroundSprite:objBackground withRect:CGRectMake(160,100, 300,120) atPoistion:pos_Top];

SEL callOnClick;
[myClassLayer AddButtonWithImage:ButtonBackground selector:callOnClick withDisabledImage:disabledBackground];

[scene addChild: myClassLayer];

// return the scene
return scene;
}

// class 2

-(void)AddButtonToHUDWithImage:(NSString *)imageName selector:(SEL)selector withDisabledImage:(NSString *)disbdImageName

{

CCMenuItem *menuItem1 = [CCMenuItemImage itemFromNormalImage:imageName selectedImage:imageName disabledImage:disbdImageName target:self selector:@selector(selector)];

CCMenu *menu = [CCMenu menuWithItems:menuItem1,nil];  
[menu setPosition:ccp(160,100)];
[self addChild:menu];
}

-(void)selector
{
    // not creating any object .. some other way if possible
}

但我想仅在 HelloWorld 中声明选择器方法（callOnClick）（myClass 是通用类）。

如何仅在 HelloWorld 中调用选择器？

Answer 1

如果不需要实例，则可以使用类方法，目标/对象将为 [SOMEType class] 或 [self class]：

+ (void)selector // <<    + not -
{
    // not creating any object .. some other way if possible
}