Property Wrapper

propWrapper.swift

@propertyWrapper struct WhiteSpacesTrimmed {
        
    var projectedValue: String
    
    var wrappedValue: String {
        didSet {
            self.projectedValue = wrappedValue
            wrappedValue = wrappedValue.trimmingCharacters(in: .whitespaces)
        }
    }
    
    init(wrappedValue:String) {
        self.projectedValue = wrappedValue
        self.wrappedValue = wrappedValue.trimmingCharacters(in: .whitespaces)
    }
    
}
 
class TestClass5 {
    @WhiteSpacesTrimmed var test = "       test"
}
 
print("projected Values")
var testClass5 = TestClass5()
print(testClass5.test) //"test"
print(testClass5.$test) //"       test"