I was just going through the Swift document and I found that Swift allow to overload the operator just like as C++ Language. Objective-C doesn’t allow to overload the operator.
As swift document we can also say “Operator Functions”.
Let’s Overload ^ (XOR Operator) to make Power of the value
Function Prototype :
Declare function prototype with left hand side value and right and side value.
Swift
1
2
func^(lhs:Int,rhs:Int)->Int{
}
Operations in the function :
To make the power of the value we have to apply following operations
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:
‘var’ parameters are deprecated and will be removed in Swift 3
Warning Function Var
Warning with:
[code language=”obj-c”]
func functionTest(var param:String) {
print(param)
}
[/code]
Solution:
[code language=”obj-c”]
func functionTest(param:String) {
print(param)
}
[/code]
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:
[code language=”obj-c”]
btn.addTarget(self, action: "functionName", forControlEvents: UIControlEvents.TouchUpInside)
[/code]
OR
[code language=”obj-c”]
btn.addTarget(self, action: Selector("functionName"), forControlEvents: UIControlEvents.TouchUpInside)
[/code]
Solution:
[code language=”obj-c”]
btn.addTarget(self, action: #selector(ViewController.functionName), forControlEvents: UIControlEvents.TouchUpInside)
[/code]
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:
[code language=”obj-c”]
var i = 0
for str in arrStr {
print(str)
i++
}
[/code]
Solution:
[code language=”obj-c”]
var i = 0
for str in arrStr {
print(str)
i += 1
}
[/code]
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:
[code language=”obj-c”]
for var i=0; i<arrStr.count; i += 1 {
print(arrStr[i])
}
[/code]
Solution:
[code language=”obj-c”]
for i in 0 ..< arrStr.count {
print(arrStr[i])
}
[/code]
__FILE__ is deprecated and will be removed in Swift 3, please use #file
