Key Value Coding (KVC)
Posted: Tue May 22, 2012 7:12 pm
Bernd posted for the last edition of OBjB an example how to use Key Value Coding. KVC is a cornerstone of a Cocoa technique called binding. You can bind UI elements to an instance by qualifying the path to the values. Instead of Objective-C's "." (dot) Objective-Basic uses "!" (exclamation) to access the properties of an instance.
Here comes an example class that defines setters and getters - these can be seen as properties.
Here is an example how to use this class:
The project:
Two questions to my readers:
What do you code in Objective Basic?
Why aren't you coding in Objective Basic yet?
It will be interesting to read your answers.
Keep on coding
Udo
Here comes an example class that defines setters and getters - these can be seen as properties.
- Code: Select all
' this is ukPerson.NSObject
Dim sName As String
Dim iAge As Integer
Sub setName(name As String)
sName=name
Log("setter called ")
End Sub
Function name() As String
Log("getter called")
Return(sName)
End Function
Function age() As Integer
Return(iAge)
End Function
Function setAge(age As Integer)
If(age > 17) Then
iAge = age
Else
iAge = 18
End If
End Function
Here is an example how to use this class:
- Code: Select all
' this is Global
Dim thePerson As ukPerson
Event AwakeFromNib()
' assign values to the instance's properties
thePerson!name = "Udo"
thePerson!age = 16
' access values of instance's properties
Alert(thePerson!name)
Alert(thePerson!age)
End Event
The project:
Two questions to my readers:
What do you code in Objective Basic?
Why aren't you coding in Objective Basic yet?
It will be interesting to read your answers.
Keep on coding
Udo