objective-c开发问题~新手

Question

-(void)setTire:(Tire*)tireatIndex:(int)index{[tiresreplaceObjectAtIndex:indexwithObject:tire];}//setTire:atIndex:-(Tire*)tireAtIndex:(int)index{Tire*tire;tire=[tiresobjectAtIndex:index];return(tire);}//tireAtIndex:这是objective-c基础教程里面的代码我就是不理解这段什么意思尤其是(Tire*)tireAtIndex:(int)index这一块求指教！谢谢！

Answer 1

就是个数组的setter/getter，只不过OC的语法就这样写，用其他语法写出来你应该能看清楚了。
相当于C语言的这种写法
cvoidsetTire(Tiretire,intindex){
tires[index]=tire;
}
TiresetTire(intindex){
returntires[index];
}
或者JAVA
javapublicvoidsetTire(Tiretire,intindex){
tires[index]=tire;
}
publicTiretireAtIndex(intindex){
returntires[index];
}
apple新语言swift
swiftfuncsetTire(tire:Tire,index:Int){
tires[index]=tire;
}
functireAtIndex(index:Int)->Tire{
returntires[index];
}
JSwithArrowFunction
javascriptvarsetTire=(tire,index)=>tires[index]=tire;
vartireAtIndex=(index)=>tires[index];
                            

Answer 2

我也很困惑为啥有人这样写代码。而且还是教程，这不是误导新手吗
不是啥SetterGetter方法，就是普通的两个方法，方法的功能就是类似设置数组的某项的object，和获取某项的object