ios - 创建子类的C4Shapes(C4 Framework)时获取未声明的标识符

我正在C4中编写一个程序，该程序包含三个单独的按钮，这些按钮在按下时都会改变形状。当我为每个按钮创建一堆方法时，如下所示:

@implementation MyButton

-(void)methodA {
    C4Log(@"methodA");
    [button1 ellipse:CGRectMake(centerPos.x - buttonWidth/2.0f, 80, buttonWidth, buttonHeight)];
}

-(void)methodB {
    C4Log(@"methodB");
    [button2 ellipse:CGRectMake(centerPos.x - buttonWidth/2.0f, centerPos.y - buttonHeight/2.0f, buttonWidth, buttonHeight)];
}

-(void)methodC{
    C4Log(@"methodC");
    [button3 ellipse:CGRectMake(centerPos.x - buttonWidth/2.0f, canvasHeight - 280, buttonWidth, buttonHeight)];
}

@end

...然后在画布上呼吁他们...

[button1 listenFor:@"touchesBegan" fromObject:button1 andRunMethod:@"methodA"];
[button2 listenFor:@"touchesBegan" fromObject:button2 andRunMethod:@"methodB"];
[button3 listenFor:@"touchesBegan" fromObject:button3 andRunMethod:@"methodC"];

...我最终得到的都是一堆未声明的标识符错误。我究竟做错了什么？

最佳答案

我需要确保您已在MyButton.h文件中定义的变量的副本，但是据我所知，从您的错误和代码中可以看到，以下行正在调用ivars:

[button1 ellipse:CGRectMake(centerPos.x - buttonWidth/2.0f, 80, buttonWidth, buttonHeight)];

需要在.h文件中定义ivars centerPos，buttonWidth和buttonHeight，如果未在其中声明其中之一，则会遇到这种错误。