Is it possible to implement a custom property wrapper in Swift?

Yes, in Swift you can create custom property wrappers. These are special types that encapsulate the logic for accessing and storing a property's value.

Here's an example of a simple wrapper that limits a property's value to the range from 0 to 100:

@propertyWrapper
struct Clamped {
    private var value: Int
    private let range: ClosedRange<Int>

    var wrappedValue: Int {
        get { value }
        set { value = min(max(newValue, range.lowerBound), range.upperBound) }
    }

    init(wrappedValue initialValue: Int, _ range: ClosedRange<Int>) {
        self.range = range
        self.value = min(max(initialValue, range.lowerBound), range.upperBound)
    }
}

struct Player {
    @Clamped(0...100) var health: Int = 100
}

var player = Player()
player.health = 150
print(player.health) // Will output 100, as the value is limited

Thus, wrappers allow reusing and centralizing the logic for working with properties.