这个示例代码中,一个SuperClass实现了+(void)load和+(void)initialize方法(实际上应该算是重写覆盖了NSObject的这两个方法);ChildClass继承于SuperClass,但是只重写+(void)initialize没有+(void)load;Insideinitialize类也有+(void)load和+(void)initialize方法,它在ChildClass的i+(void)initialize方法中被构建出一个...
1+(void)load会引发+(void)initialize2/*** Interface ***/3@interfaceSuperClass:NSObject4@end56@interfaceChildClass:SuperClass7@end89@interfaceInsideinitialize:NSObject10-(void)objectMethod;11@end1213/*** Implementation ***/14@implementation SuperClass1516+(void)initialize{17NSLog(@"%@ %s",[sel...
这个示例代码中,一个SuperClass实现了+(void)load和+(void)initialize方法(实际上应该算是重写覆盖了NSObject的这两个方法);ChildClass继承于SuperClass,但是只重写+(void)initialize没有+(void)load;Insideinitialize类也有+(void)load和+(void)initialize方法,它在ChildClass的i+(void)initialize方法中被构建出一个...
这个示例代码中,一个SuperClass实现了+(void)load和+(void)initialize方法(实际上应该算是重写覆盖了NSObject的这两个方法);ChildClass继承于SuperClass,但是只重写+(void)initialize没有+(void)load;Insideinitialize类也有+(void)load和+(void)initialize方法,它在ChildClass的i+(void)initialize方法中被构建出一个...
结构体的数据和方法结合,我们把整个结构体称为类(Class)。仅仅有了类,是不能执行任何操作的,我们必须把类进行实体 化,实体化后的类我们称之为对象(Object)。从这个角度上来说,我们可以认为类是对象的模版。 如果要使用类,那么和构造体相类似,我们必须声明这个类。
Class aClass = [anObject class]; Class rectClass = [Rectangle class]; 所有的类都属于类对象,使用Class类型和使用类名进行静态类型匹配是等效的。因此,类对象也像类实例那样,可以进行动态类型匹配、接收消息以及从别的类继承方法。不同之处在于它们是由编译器产生的,没有自己的数据结构,它们是用于运行时系统...
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64bits: CoCreateInstance 0x80040154 Class not registered 8 Bit BMP conversion A dynamic link library (DLL) initialization routine failed. (Exception from HRESULT: 0x8007045A) a nonstatic member reference must be relative to a specific object Abort() has been called About MAX_PATH About VS2015 CR...
Compiler warning (level 3 and level 4) C4451'classname1::member': Usage of ref class 'classname2::member' inside this context can lead to invalid marshaling of object across contexts Compiler warning (level 1, Error) C4452'identifier': public type cannot be at global scope. It must...