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swiftvariables

Initialization error: Cannot use instance member within property initializer before self is available

let screenSize = UIScreen.main.bounds.height
let IS_IPHONE_4_OR_LESS  = screenSize < 568.0

"Cannot use instance member within property initializer before self is available" this is the error am getting when executing the code.

Solution

  • Constants refer to fixed values that a program may not alter during its execution. IS_IPHONE_4_OR_LESS is a constant hence it need the fix value at the time of initialisation of a class hence the error. In your case its computing the value based on the screen height so you can declare it as a computed property like below

     class Constants: NSObject {
    let screenSize = UIScreen.main.bounds.size.height
    var IS_IPHONE_4_OR_LESS: Bool {
        return screenSize < 568
    }
 }