stack-overflow-swift-2026-06-08
Swift · · 3 min read
Top Voted Swift Questions on Stack Overflow — 2026-06-08
10 questions
Passing data between view controllers
Score: 1503 | Answers: 44 | Views: 535054 | Tags: ios, objective-c, swift, model-view-controller, uiviewcontroller
I'm new to iOS and Objective-C and the whole MVC paradigm and I'm stuck with the following: I have a view that acts as a data entry form and I want to give the user the option to select multiple products. The products are listed on another view with a UITableViewController and I have enabled multiple selections. How do I transfer the data from one view to another? I will be holding the selections
How do I call Objective-C code from Swift?
Score: 1143 | Answers: 17 | Views: 390304 | Tags: swift, objective-c
In Swift, how does one call Objective-C code? Apple mentioned that they could co-exist in one application, but does this mean that one could technically re-use old classes made in Objective-C whilst building new classes in Swift?
How to change Status Bar text color in iOS
Score: 1096 | Answers: 61 | Views: 678864 | Tags: ios, swift, ios7, statusbar, uistatusbar
My application has a dark background, but in iOS 7 the status bar became transparent. So I can't see anything there, only the green battery indicator in the corner. How can I change the status bar text color to white like it is on the home screen?
#pragma mark in Swift?
Score: 1022 | Answers: 20 | Views: 258399 | Tags: swift, documentation
In Objective C, I can use #pragma mark to mark sections of my code in the symbol navigator. Since this is a C preprocessor command, it's not available in Swift. Is there a stand-in for this in Swift, or do I have to use ugly comments?
Swift Beta performance: sorting arrays
Score: 990 | Answers: 9 | Views: 120132 | Tags: swift, performance, sorting, xcode6, compiler-optimization
I was implementing an algorithm in Swift Beta and noticed that the performance was very poor. After digging deeper I realized that one of the bottlenecks was something as simple as sorting arrays. The relevant part is here: let n = 1000000 var x = [Int](repeating: 0, count: n) for i in 0..<n { x[i] = random() } // start clock here let y = sort(x) // stop clock here In C++, a similar operation
How to iterate a loop with index and element in Swift
Score: 979 | Answers: 21 | Views: 703955 | Tags: arrays, swift, enumeration
Is there a function that I can use to iterate over an array and have both index and element, like Python's enumerate ? for index, element in enumerate(list): ...
#ifdef replacement in the Swift language
Score: 887 | Answers: 19 | Views: 361580 | Tags: swift, xcode, preprocessor, preprocessor-directive
In C/C++/Objective C you can define a macro using compiler preprocessors. Moreover, you can include/exclude some parts of code using compiler preprocessors. #ifdef DEBUG // Debug-only code #endif Is there a similar solution in Swift?
Get the length of a String
Score: 846 | Answers: 41 | Views: 549231 | Tags: swift, string
How do you get the length of a String ? For example, I have a variable defined like: var test1: String = "Scott" However, I can't seem to find a length method on the string.
Split a String into an array in Swift?
Score: 844 | Answers: 41 | Views: 831362 | Tags: arrays, swift, string, split
Say I have a string here: var fullName: String = "First Last" I want to split the string based on whitespace and assign the values to their respective variables var fullNameArr = // something like: fullName.explode(" ")
var firstName: String = fullNameArr[0] var lastName: String? = fullnameArr[1] Also, sometimes users might not have a last name.
How do I see which version of Swift I'm using?
Score: 761 | Answers: 19 | Views: 325233 | Tags: swift, xcode, terminal
I just created a new Swift project within Xcode. I am wondering which version of Swift it's using. How can I see, in Xcode or the terminal, what version of Swift I am using inside my project?