In Sprite Kit do not use NSTimer, performSelector:afterDelay: or Grand Central Dispatch (GCD, ie any dispatch_… method) because these timing methods ignore a node’s, scene’s or the view’s paused state. Moreover you do not know at which point in the game loop they are executed which can cause a variety of issues depending on what … Read more
From an Apple employee on the Developer Forums: “A way to declare to the compiler and the built program that you really don’t want to be NSCoding-compatible is to do something like this:” required init(coder: NSCoder) { fatalError(“NSCoding not supported”) } If you know you don’t want to be NSCoding compliant, this is an option. … Read more
<< is the left shift operator. You can better visualize it in binary: 1 0000 0001 << 1 ^ shift this one bit to the left —- = ——— 2 0000 0010 1 0000 0001 << 2 ^ shift this two bits to the left —- = ——— 4 0000 0100 3 0000 0011 << … Read more