Swizzling UIImage.init(named:) returns nil when getting the instance method

Question

I am trying to swizzle UIImage init functions but when trying to get the instance function they return nil. Any idea?

let instance = class_getInstanceMethod(self, #selector(UIImage.init(named))
let instanceWithBundle = class_getInstanceMethod(self, #selector(UIImage.init(named:in:with)

score 4 · Accepted Answer · answered Feb 02 '20 at 09:14

4

It returns nil because in Objective-C they are actually class methods:

+[UIImage imageNamed:]

+[UIImage imageNamed:inBundle:withConfiguration:]

Use class_getClassMethod instead (and make sure to add colons after named and with in your method selectors):

let imageNamedMethod = class_getClassMethod(UIImage.self, #selector(UIImage.init(named:)))
let imageNamedInWithMethod = class_getClassMethod(UIImage.self, #selector(UIImage.init(named:in:with:)))

answered Feb 02 '20 at 09:14

TylerP

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the swizzled init is not being called, any idea? – Tal Zion Feb 02 '20 at 12:48
@TalZion You should probably make a new question for that, as my answer for that is quite involved (more than I can put in a comment). – TylerP Feb 02 '20 at 19:50
Thanks, here you go @TylerTheCompiler https://stackoverflow.com/q/60034039/4697535 – Tal Zion Feb 03 '20 at 06:21

Swizzling UIImage.init(named:) returns nil when getting the instance method

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