Swift is a programming language designed by Apple for creating iOS and OS X apps. Swift builds upon the foundation of C and Objective-C.
-1
votes
1answer
26 views
Swift: Creating an empty array
The following:
var emptyArray = [String]();
What do I need the parentheses () for? [String] says, that the array accepts strings only. But why do I have to put the () there?
-2
votes
0answers
26 views
Swift: for-in with two values [migrated]
I started learning C some weeks ago and today I started learning Swift. The code is the following:
import Foundation
let interestingNumbers = [
"Prime": [2, 3, 5, 7, 11, 13],
...
-3
votes
0answers
43 views
Longer version of sort array [on hold]
I have an array of structs.
struct Item {
let textLabel : NSDate
let detailTextLabel : NSDate
}
I sorted them with the following code:
myArray.sort{$0.textLabel.compare($1.textLabel) == ...
2
votes
1answer
429 views
Usage of MVVM in iOS
I'm an iOS developer and I'm guilty of having Massive View Controllers in my projects so I've been searching for a better way to structure my projects and came across the MVVM (Model-View-ViewModel) ...
3
votes
2answers
242 views
Why does Swift not require semicolons? [closed]
I normally code in either c# or Objective-C and recently took it upon myself to learn Apple's new programming language - Swift.
The first thing I noticed is that you don't need to add semicolons to ...
1
vote
3answers
1k views
Using the optional 'self' reference in instance methods in Swift as a matter of style
Swift allows optional prefixing of method calls and property references to the current object instance via self. Removing these prefixes can declutter code but, depending on the length of the method ...
2
votes
1answer
190 views
Static properties and implicit “self” property in structures and enumerations vs classes in Swift
I am currently reading the Swift language documentation and came across these sentences in the chapter about methods:
Similarly, type methods on structures and enumerations can access
static ...
-1
votes
1answer
41 views
Global counter using iOS and Parse? [closed]
I'm very new to Parse and trying to set up what is basically a voting app where I can collect data on how many times all users have pressed a button. I found some information on Atomic Increment ...
1
vote
1answer
120 views
Best architecure approach to develop iOS app
I'm trying to create a calendar app similar to this design: Calendar Design
I'm currently using this calendar framework: CVCalendar and it's working great, but my question is, what do you think is ...
3
votes
1answer
182 views
Ways to do callback, when and where
I've recently started to do some more complicated programming with network-related work on iOS with Swift.
This introduced a lot of asynchronous code not only in networking but also some exchange of ...
1
vote
2answers
79 views
Is there a detriment to using SQLite over a pList for persistence?
I'm making a fairly simple application and I've got a settings menu that stores times and some boolean values. I have the application storing and retrieving data already but I started to wonder if ...
0
votes
2answers
148 views
Testable design in Swift
I've been searching for so long about how to design testable classes in Swift but every information site just describe basic stuff like how to test, how to assert, why is testing good...
My current ...
0
votes
0answers
58 views
How to ensure this constraint at compile time?
I have an interesting constraint/invariant and I would love to hear people's input on how to maintain it. Big bonus if it can be ensured at compile time...
I have the types below, and the following ...
32
votes
9answers
4k views
Why would a program use a closure?
After reading many posts explaining closures here I'm still missing a key concept: Why write a closure? What specific task would a programmer be performing that might be best served by a closure?
...
2
votes
1answer
105 views
MVVM: Should the VM be a value type?
I have been recently strongly influenced by two lectures: Gary Bernhardt's "Boundaries" (https://www.destroyallsoftware.com/talks/boundaries) and Andy Matuschak's "Controlling Complexity" ...
1
vote
3answers
812 views
How does garbage collection compare to reference counting? [duplicate]
I starting working through an online course on iOS development in the new language from Apple, Swift. The instructor made a point that raised this question in my mind. He said something to the ...
1
vote
3answers
297 views
Decorator design pattern in swift
Im reading "Head first design patterns" (here you can find exact example mentioned in book)
While going through Decorator design pattern, everything was crisp and clear until i stumbled into this
...
1
vote
2answers
453 views
Workaround for unit testing Core Data in Swift
I am still pretty new to programming, but my first app was recently approved and is now for sale on the App Store. My app uses Core Data and is written in Swift. After some initial difficulties, I ...
24
votes
5answers
6k views
Why design a modern language without an exception-handling mechanism?
Many modern languages provide rich exception handling features, but Apple's Swift programming language does not provide an exception handling mechanism.
Steeped in exceptions as I am, I'm having ...
3
votes
1answer
384 views
Would I rather use Core Data or save files to the system?
I'm developing an iOS app which basically fetches a JSON from a remote location, parses it and instantiates classes for a couple of its elements. For some visualization, this should give you a basic ...
94
votes
5answers
41k views
How can Swift be so much faster than Objective-C in these comparisons?
Apple launched its new programming language Swift at WWDC14. In the presentation, they made some performance comparisons between Objective-C and Python. The following is a picture of one of their ...
-2
votes
1answer
345 views
Swift and PDF do they mix? [closed]
Couple of quick questions. First I have zero programming experience but somehow I have an app about 2/3 of the way done. The bulk of my app will be essentially a book to which I am adding one or two ...
2
votes
1answer
2k views
Swift Protocol Naming Conventions [closed]
Coming from a mainly c# background, I'm used to using the term "interface" for describing an object with no implementation that defines behaviour. In c#, the convention is to prepend interface names ...
30
votes
2answers
3k views
Do modern languages still use parser generators?
I was researching about the gcc compiler suite on wikipedia here, when this came up:
GCC started out using LALR parsers generated with Bison, but gradually switched to hand-written ...
