Question

我在C4制作一个程序，它由三个独立的按钮组成，按下时会改变它们的形状。当我为每个按钮创建一堆方法时：

@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

...然后在画布中调用它们......

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

...我最终得到的是一堆未声明的标识符错误。我做错了什么？

Answer 1

我需要查看您在MyButton.h文件中定义的变量的副本以确定，但据我从您的错误和您的代码中可以看出，以下行调用了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，如果其中一个未被声明，那么您将遇到此类错误。

创建子类C4Shapes时获取未声明的标识符（C4 Framework）

1 个答案: