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iOS

Posted by aaron du
aaron du
5,946 Points

swift methods

I still don't understand swift methods, and what pasan meant by saying "So remember that a method is a function that is associated with a particular type."

2 Answers

Michael Hulet
Michael Hulet
47,912 Points
Michael Hulet
Michael Hulet
47,912 Points

Methods are exactly like normal functions, except a method is defined within a class, struct, protocol, or enum. To illustrate this:

func someFunction() -> Void{
    // This is a function
}

class SomeObject{
    func someMethod() -> Void{
        // This is a method
    }
}
aaron du
aaron du
5,946 Points

Thanks so much, that is so helpful. Your explanation is so simple and clear to me. You helped so much!

Brennan White
Brennan White
11,646 Points
Brennan White
Brennan White
11,646 Points

In addition to what Michael Hulet said, methods can also be referenced by dot notation on an instance of that struct, class. etc.

class Enemy {
    var life: Int = 1
    let position: Point

    init(x: Int, y: Int) {
        self.position = Point(x: x, y: y)
    }

    func decreaseLife(by factor: Int) {
        life -= factor
    }
}

Since the class Enemy has a method of decreaseLife, an instance of that class can use the method.

let E1 = Enemy(x: 4, y: 5)
E1.decreaseLife(by: 1)
aaron du
aaron du
5,946 Points

thanks, that was helpful!