Swift: Developing iOS Applications

Control flow

Objective-C has many of the same control flow paradigms as Swift. We will go through each of them quickly, but before we do, let's take a look at the Objective-C equivalent of print:

var name = "Sarah"
println("Hello \(name)")
NSString *name = @"Sarah";
NSLog(@"Hello %@", name);

Instead of print, we are using a function called NSLog. Objective-C does not have string interpolation, so NSLog is a somewhat more complex solution than print. The first argument to NSLog is a string that describes the format to be printed out. This includes a placeholder for each piece of information we want to log that indicates the type it should expect. Every placeholder starts with a percent symbol. In this case, we are using an at-symbol to indicate what ...