Keyword Lazy in Swift
lazy variables are variables will be computed until accessing. In other words,
lazy variables won't have the real value until get called/used. As
lazy variables can be re-assigned, so it can't be used on constants which normally defined by
One example of using
Scenarios of use
One of the good use scenarios is we can use the lazy feature on View initialization setup. For example, if the view have multiple states, such as
empty list or
populated list, they can be lazily loaded when in different situation, so the compiler won’t have to compute both of the two views (empty and populated) at one time.
What about Objective-C
Objective-C doesn’t natively support the
lazy, but some simple workout can be easily implemented.
Originally published at https://needone.app on December 31, 2020.