Swift 2.2 Warnings and It’s Solutions – Xcode 7.3

Swift 2.2 Warnings and It’s Solutions – Xcode 7.3

 

Xcode 7.3 came with Swift 2.2 Version. I just updated to Xcode 7.3 and found following warnings because of Swift version change.

List of warnings with it’s solution:

 

 

Warning Function Var

1. • ‘var’ parameters are deprecated and will be removed in Swift 3


2. Warning with:

    

   1 2 3

   func functionTest(var param:String) {     print(param) }

   Solution:

   1 2 3

   func functionTest(param:String) {     print(param) }

   If you want to update that variable inside the function then you have to create copy of that variable to do operations on that. 

    

   • Use of string literal for Objective-C selectors is deprecated; use ‘#selector’ instead

    

   Warning Selector

   
   Warning with:

    

   1	btn.addTarget(self, action: "functionName", forControlEvents: UIControlEvents.TouchUpInside)

   OR

   1	btn.addTarget(self, action: Selector("functionName"), forControlEvents: UIControlEvents.TouchUpInside)

   Solution:

   1	btn.addTarget(self, action: #selector(ViewController.functionName), forControlEvents: UIControlEvents.TouchUpInside)

   Apple Documentation : Added information about the #selector syntax for Objective-C selectors to the Selector Expression section.

    

   • ‘++’ is deprecated: it will be removed in Swift 3

    

   Warning ++

   
   Warning with:

    

   1 2 3 4 5 6

   var i = 0           for str in arrStr {     print(str)     i++ }

   Solution:

   1 2 3 4 5 6

   var i = 0           for str in arrStr {     print(str)     i += 1 }

   Apple Documentation : Removed discussion of C-style for loops, the ++ prefix and postfix operators, and the — prefix and postfix operators.

    

   • C-style for statement is deprecated and will be removed in a future version of Swift

    

   Warning For Statement

   
   Warning with:

    

   1 2 3

   for var i=0; i<arrStr.count; i += 1 {     print(arrStr[i]) }

   Solution:

   1 2 3

   for i in 0 ..< arrStr.count {     print(arrStr[i]) }

    

   • __FILE__ is deprecated and will be removed in Swift 3, please use #file

   Warning __FILE__

   Warning with:

   1

   __FILE__

   Solution:

   1

   #file

More swift tutorials/articles are available here.

Happy Coding 🙂