How do you tell if a string is empty in Swift? That depends on what you mean by “empty”. You might mean a string with zero length, or maybe also an optional string that is nil. What about a “blank” string that only contains whitespace. Let’s see how to test for each of those conditions with Swift.
How do you compare two version strings in Swift? For example, how can I check if version “2.2.5” is higher than “2.0.3” or that a version is at least “1.8.5”? As long as your version strings follow a consistent format it turns out to be not too hard.
Read On →The delegate pattern is often used by a child view controller to communicate with its parent view controller, but it’s not the only way. A lesser used, but occasionally useful, alternate approach is the responder chain.
Read On →Are you upgrading an Xcode project to Swift 5? It’s a mostly pain-free experience, but you might hit a warning about switching on enums with additional unknown values.
Read On →How do you implement state preservation and restoration when your view controller model is a Swift struct that does not support NSCoding? My notes on how to wrap the struct in a dictionary with some help from Sourcery.