Objective-C中的简单继承问题
我有两个 Objective-C 类，一个是从另一个派生的，如下
@interface DerivedClass : BaseClass
{
}
所示 下面的代码部分属于 BaseClass:
- (id)init {
if (self = [super init]) {
[self configure];
}
return self;
}
- (void) configure{} //this is an empty method
而代码部分属于 DerivedClass:
-(void) configure{
NSLog(@"derived configure called");
}
现在，当我说 衍生实例 = [DerivedClass new]; 并观察调用堆栈，我看到派生类的 configure 方法在基类的 init 的 [self configure] 行被调用> 方法。
我是一个 Objective-C 菜鸟，我对如何从基类的方法调用派生类的方法感到困惑。 “self”关键字被解释为与某些语言的“this”关键字相同，但我认为这种解释并不完全正确，对吗？
I have two Objective-C classes and one is derived from the other as
@interface DerivedClass : BaseClass
{
}
The code section below belongs to BaseClass:
- (id)init {
if (self = [super init]) {
[self configure];
}
return self;
}
- (void) configure{} //this is an empty method
And the code section belongs to the DerivedClass:
-(void) configure{
NSLog(@"derived configure called");
}
Now, when I say derivedInstance = [DerivedClass new]; and watch the call stack, I see that the configure method of my derived class gets called at the [self configure] line of the base's init method.
I'm an Objective-C noob and I'm confused about how a method of a derived class gets called from the method of a base class. "self" keyword is explained to be the same thing as "this" keyword of some languages but I think this explanation is not completely correct, right?
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[self someMessage]会将消息“someMessage”发送到当前对象，该对象是DerivedClass的实例。消息分派是在运行时动态完成的，因此它的行为将与当时的对象一样。
[self someMessage]will send the message "someMessage" to the current object, which is an instance ofDerivedClass.Message dispatch is done dynamically at run-time, so it will behave as whatever the object is at that time.