Swift's basic properties-computed properties

Use of Didset

• In OC, we usually want to do some extra work after assigning a value to a variable.
• The most classic application is to customize the cell, through the model Setup method to complete the cell filling

• var length:int? {    Didset {        "%02d:%02d:%02d"36003600  - ])    }}var timestr:string?

  Computed attribute (also can be said to be a Get method)

• var title:string {    get  {        return'"" " )    }}

  • A property that implements only getter methods is called a computed property, equivalent to the ReadOnly attribute in OC
  • Computed properties themselves do not occupy memory space
  • You cannot set a value for a computed property
  • Computed properties can use the following code shorthand

  • var title:string {    return"" "")} 

Swift's basic properties-computed properties