Reverse Loop in Swift

First of all, protocol extensions change what is reverse used:

for i in (1...5).reverse() { print(i) } // 5 4 3 2 1

Stride have been reworked in Xcode 7 Beta 6. The new usage is:

ForIInch 0.stride(To: -8, By: -2) { Print(I  } //0-2 -4-6for I in 0. Stride (through: -< Span class= "lit" >8, by:  -2)   { print (i } //0-2 -4-6-8      

It also works for Doubles :

for i in 0.5.stride(to:-0.1, by: -0.1) { print(i) }

Be wary of floating point compares here for the bounds.

Earlier Edit for Swift 1.2: As of Xcode 6 Beta 4, by and Reverserange don ' t exist anymore: [

If you were just looking to reverse a range, the reverse function was all you need:

for i in reverse(1...5) { println(i) } // prints 5,4,3,2,1

As posted by 0x7fffffff There are a new stride construct which can be used to iterate and increment by AR Bitrary integers. Apple also stated, floating point, is coming.

Sourced from his answer:

ForXInchStride(From: 0,Through: -8, By: -2) {println(X) 0,-2,-4,-6,-8}for x in Stride(from: 6, to: -2,  by: -4) { println(x) //6, 2}   

Reverse Loop in Swift