Swift: Key Notes

swift_key_notes.md

• You can only use public swift classes or those marked with @objc in objective file.

• The public properties & method will be available to you
• The internal properties & method will only be available if objective--c bridging file is present.
• only private marked with @objc,@IBAction or @IBOutlet will be accessible

• If you mark a class public(unlike private and internal), it members will have a default access of internal.
• Tuple type assume access of its most restrictive type.
• Function assume access of its most restrictive parameter type or return type.
• access type of associate type in an enum must be at least that of the whole enum. The example below is an error because associated type has overall access of private while the enum has default internal access. Since private is less than internal, its an error. The associated type must either be public or internal

enum  ENUMERATION{
      case A(PrivateClass,PubicClass)
}

• For a variable, you can use the access specifier to specify if only set or get should have that access

class A{
  private(set) var name:String
}

• You can specify access type for init except the required init.
• If a protocol has public type, its require get public access type unlike classes.
• If a internal protcol conform to private protocol, it becomes private.
• A private typealias can alias private,internal & public unlike public typealias which can only alias public.