Objective-C对Class变量的调用类方法

- (void)foo:(Class)clazz {
  // Now i want to call +myClassMethod on clazz
}

您可以使用-respondsToSELEctor：,就像使用任何Objective-C对象一样.您还可以使用isSubclassOfClass：来测试该类是否是另一个类的子类.

- (void)foo:(Class)clazz 
{
    if ([clazz respondsToSELEctor:@SELEctor(myClassMethod)])
    {
        [clazz myClassMethod];
    }
    else
    {
        // clazz does not implement that class method.
    }

    if ([clazz isSubclassOfClass:[MyBaseClass class]])
    {
        [clazz myClassMethod];
    }
    else
    {
        // clazz is not a subclass of MyBaseClass.
    }
}