CODEWITHSUNDEEP
iosswiftuibutton
AamirR
AamirR

Reputation: 12208

Whats the reason UIButton's titleLabel is optional?

Whats the reason UIButton's titleLabel is optional?

Is it safe to implicitly unwrapped this optional by placing an exclamation mark? If not, what is the case when titleLabel is nil?

BTW, I use UIButton.titleLabel to change UILabel properties which are not directly accessible from UIButton, for example to change font or to have multiline label.

Upvotes: 2

Views: 974

Answers (2)

Magoo
Magoo

Reputation: 2638

Best practice is not to force unwrap, but you can pretty much guarantee a UIButton.titleLabel exists when you need it. I'm not 100% sure of the syntax but it's some form of lazy loading that isn't lazy var titleLabel:UILabel = {}()

Personally I'd say if you're concerned about unwrapping I'd use guard or if let

guard let label = myButton.titleLabel else {return}
label.font = .systemFontOfSize(10.0)

if let label = myButton.titleLabel { label.font = .systemFontOfSize(10.0) }

Upvotes: 1

Bista
Bista

Reputation: 7903

Because a Button can be without any Title assigned to it. Sometimes only Image is required.

Hence in certain case when you'll try to access the Button's Title, without assigning one, the app might crash.

Upvotes: 1

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