CODEWITHSUNDEEP
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Kiwo Tew
Kiwo Tew

Reputation: 1531

swift iOS difference between : and ()

As a swift newbie I wonder what the difference between:

var img : UIImageView
var img = UIImageView()

I see them used a lot in the same situation

Upvotes: 3

Views: 134

Answers (2)

aledustet
aledustet

Reputation: 1001

The first one is a variable declaration and there you set the type of the variable, not a value.

The second line sets a new instance of the class.

Since swift is strong typed everything must have a type, so if you want to store something in a var you need to set the type of the var first, therefore the first line, on the second one is classic instantiation of the variables.

Upvotes: 1

bolnad
bolnad

Reputation: 4583

the first example var img: UIImageView creates a variable the WILL be of type UIImageView, once something is assigned to it. This line itself does not initialize or create a new instance and its not assigned to anything.

the second example is actually creating a new instance of UIImageView assigned to the variable that is called img. It infers from the instance create of UIImageView that it will a variable of type UIImageView so no need to type it, its redundant

Upvotes: 8

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