我们可以在if - else条件下使用(id)吗？

Question

我已经在cocos2d中以下列方式编写了我的代码.

id actionTo = [CCFadeOut actionWithDuration:4.0f];  
id actionTo0 = [CCSequence actionWithDuration:2.0f];
if (m < enemyNumber)
    id actionTo1 = [CCCallFunc actionWithTarget:self selector:@selector(goToNextScene)];
else
    id actionTo1 = [CCCallFunc actionWithTarget:self selector:@selector(goToEndScene)];
id actionSeq = [CCSequence actions:actionTo, actionTo0, actionTo1, nil];
[targetE runAction: [CCSequence actions:actionSeq, nil]];  

error: expected expression before 'id'  

我收到了上述错误.我们不应该在if条件下使用(id)吗？我希望通过使用if-else条件来调用两个选择器.我该怎么做？谢谢.

Answer 1

您无法在该位置声明新变量.你应该做的是actionTo1在if-condition之前声明你的变量并在那里设置它的值:

...
id actionTo1 = nil;
if (m < enemyNumber)
    actionTo1 = [CCCallFunc actionWithTarget:self selector:@selector(goToNextScene)];
else
    actionTo1 = [CCCallFunc actionWithTarget:self selector:@selector(goToEndScene)];
...