Swift Object ModelLesson 33Free preview

Initializers

This lesson is part of Swift · All levels

Summary

This lesson reviews the Initializers in Swift who are tasked with preparing instances of class, struct, or enum to be ready for use before their properties are accessed. Swift applies the two-phase initialization rule that guarantees all stored properties are filled with valid values before another code is executed.

Key points

Initiation is declared with the keyword 'init()'
All stored non-optional properties must be initialized before the init process is completed
Class distinguishes designated initialisers and convenience initialisers
Failed Initializers ('init?()') can return zero if the initialization fails to meet data validation

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