From Apple book “One of the most important differences between structures and classes is that structures are always copied when they are passed around in your code, but classes are passed by reference.” Can anyone help me understand what that means? To me, classes and structs seem to be the same. 13 Answers 13
Here it says, “Note: the _ means “I don’t care about that value””, but coming from JavaScript, I don’t understand what that means. The only way I can get these functions to print was by using the underscores before the parameters: func divmod(_ a: Int, _ b:Int) -> (Int, Int) { return (a / b, … Read more
With this simple class I am getting the compiler warning Attempting to modify/access x within its own setter/getter and when I use it like this: var p: point = Point() p.x = 12 I get an EXC_BAD_ACCESS. How can I do this without explicit backing ivars? class Point { var x: Int { set { … Read more
I get this error after adding a Swift class to an old Xcode project. dyld: Library not loaded: @rpath/libswift_stdlib_core.dylib How can I make the project run again? 36 Answers 36 For me none of the previous solutions worked. We discovered that there is a flag ALWAYS_EMBED_SWIFT_STANDARD_LIBRARIES (in earlier versions: “Embedded Content Contains Swift Code”) in … Read more
I am starting to learn Swift, and have been following the very good Stanford University video lectures on YouTube. Here is a link if you are interested or it helps (although it isn’t required to understand my problem): Developing iOS 8 Apps with Swift – 2. More Xcode and Swift, MVC While following the lectures … Read more
I’d like to store an array of weak references in Swift. The array itself should not be a weak reference – its elements should be. I think Cocoa NSPointerArray offers a non-typesafe version of this. 20 Answers 20
How can I determine the number of cases in a Swift enum? (I would like to avoid manually enumerating through all the values, or using the old “enum_count trick” if possible.) 26 Answers 26
override func preferredStatusBarStyle() -> UIStatusBarStyle { return UIStatusBarStyle.LightContent; } Using the above code in any ViewController to set the statusBar color to White for a specific viewcontroller doesnt work in iOS8 for me. Any suggestions? Using the UIApplication.sharedApplication method, the color changes after required changes in the Info.plist for the whole app. // Change the … Read more
Is there anyway to simulate the [NSString stringWithFormat:@”%p”, myVar], from Objective-C, in the new Swift language? For example: let str = “A String” println(” str value \(str) has address: ?”) 15 Answers 15
I have a navigation bar with a title. When I double click the text to rename it, it actually says it’s a navigation item, so it might be that. I’m trying to change the text using code, like: declare navigation bar as navagationbar here button stuff { navigationbar.text = “title” } That’s not my code … Read more
