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It’s just an array setter/getter, but the syntax of OC is written like this. You should be able to see it clearly if written in other syntax.
This is equivalent to this writing method in C language

cvoid setTire(Tire tire,int index){
    tires[index]=tire;
}
Tire setTire(int index){
    return tires[index];
}

or JAVA

javapublic void setTire(Tire tire,int index){
    tires[index]=tire;
}
public Tire tireAtIndex(int index){
    return tires[index];
}

apple new language swift

swiftfunc setTire(tire:Tire,index:Int){
    tires[index]=tire;
}
func tireAtIndex(index:Int)->Tire{
    return tires[index];
}

JS with Arrow Function

javascriptvar setTire=(tire,index)=>tires[index]=tire;
var tireAtIndex=(index)=>tires[index];

I’m also confused as to why someone writes code like this. And it’s a tutorial. Isn’t this misleading to newbies? It’s not a Setter Getter method, it’s just two ordinary methods. The function of the method is similar to setting the object of a certain item in the array, and getting the object of a certain item

Now you no longer need to define instance variables and write access methods, just use properties directly!
The tutorials you are watching are probably from 3 years ago.

For tutorials on properties, you can visit our blog about the introduction of properties