Property wrappers in Swift
Why need ????
Like we want to perform a task whenever initialize the property or change the property value. We have WillSet/DidSet to perform but it seems to repeated for every property. To avoid this property wrapper comes in existence.
Introduce in swift 5.1
There are two requirements for a property wrapper type [1]:
- It must be defined with the attribute @propertyWrapper.
- It must have a wrappedValue property, and wrappedValue is computed property.
Usage Restrictions
- A property with a wrapper cannot be overridden in a subclass.
- A property with a wrapper cannot be lazy, @NSCopying, @NSManaged, weak, or unowned.
- A property with a wrapper cannot have custom set or get method.
- wrappedValue, init(wrappedValue:) and projectedValue must have the same access control level as the wrapper type itself.
- A property with a wrapper cannot be declared in a protocol or an extension.
To Avoid race condition we are using locks, likes: NSLock, os_unfair_lock, pthread_rwlock_t, DispatchSemaphore, serial DispatchQueue and OperationQueue.
Let's see how the wrapper class helps in race condition
Atomic Wrapper that helps for the serial data flow
How to use:
A wrapper that will help Capitalized initial character
How to use:
A wrapper class that will help you to save the model data
How to use:
An example of a wrapper class that will help you to save the data, like we save in the Userdefault
How to use:
GitHub Link: https://github.com/Nirajpaul2/PropertyWrapper
Important Links:
https://github.com/marksands/BetterCodable
