Extensions add new functionality to an existing class, structure, or enumeration type.
Apple Pre-release Docs
Questions tagged [swift-extensions]
394 questions
0
votes
3 answers
Swift Array of dictionaries extension sortInPlace
Using Swift 2.1 I'm trying to make a function that sorts an array of dictionaries by the date value for the key dateKey.
I want to add this as an extension to the Array type, so I can call it using someArray.sortDictionariesByDate(dateKey: String,…
thomey
- 97
- 9
0
votes
1 answer
Can't invoke protocol method on generic type restricted by other protocol
I have the following:
protocol Guard {
var prisoners: Array? { get set }
func smack(prisoner: T)
func smackAll()
}
extension Guard {
final func smackAll() {
prisoners?.forEach() { smack($0) }
…
user2320861
- 1,391
- 2
- 11
- 28
0
votes
1 answer
How can I create an extension with a function which creates a UIView which can be placed at different positions?
I have to create a custom UIView which is actually a circle having the same size and appearance which is placed at different positions in a view. I created an extension which works fine for one circle, but I want to use that same function to place…
pogbamessi
- 311
- 3
- 17
0
votes
1 answer
Extension for CollectionType with element of certain type ignores subtypes
I'm trying to create an extension for collection types containing elements of a certain type FooType and this works just fine:
extension CollectionType where Generator.Element == FooClass
{
func doSomething()
}
let collectionType =…
Henrik Lineholm
- 356
- 1
- 6
- 9
0
votes
1 answer
Extension with a receive value
I'm learning about extension in swift and I want to create a extension for String like the command .hasPrefix(), in that command we send a String, for test it I try this code:
extension String{
var teste:(String) { return "\(self) - \($1)"…
LettersBa
- 747
- 1
- 8
- 27
0
votes
2 answers
static protocol extensions generates Illegal Instruction compiler error
I have read up on the Extensions available in Swift and was wondering if static protocol extensions are supported? I know that instance methods can be used in a protocol extension.
I was wanting to create a protocol for my repository, along with an…
Johnathon Sullinger
- 7,097
- 5
- 37
- 102
0
votes
1 answer
Swift extension for getting instance private property
I'm using this open source library which is a wrapper on AddressBook.framework. There's no method for deleting contact, so I'm gonna use default ABAddressBookRemoveRecord. However for that I need the ABAddressBookRef.
Since it's declared in…
Adam Bardon
- 3,829
- 7
- 38
- 73
0
votes
2 answers
Calling delegate method from Swift's Extension class
All
I am implementing a UIAlertView extension for callback implementation like UIAlertView+Block in Objective C but the delegate method is not calling from this class any help.
Thanks in advance.
Gopal Devra
- 564
- 2
- 5
- 24
0
votes
2 answers
Swift Extension Class Function only works in 1 file
I have a file called UIElements.swift which contains some extension I want to use throughout my app.
They've worked great so far. Until I created a new viewController, and I can't get any of them to work in that or any other viewControllers I make.…
MLyck
- 4,959
- 13
- 43
- 74
0
votes
1 answer
Does not have a member named ( Swift )
I have two labels (CountryCode, CountryName) in prototype cells, and I created a class for them called " CountryCell " and I created the TableViewController class called " CountriesVC " I made the labels' outlets in the CountryCell but I want to use…
user3380361
- 25
- 5
0
votes
1 answer
Converation from array of Bytes to Struct. Swift
I have dump of bytes and i need to parse structures
c++ exmpl:
(*(SomeStruct*)(bufPtr))
how can i do it on swift?
t0me0
- 13
- 1
0
votes
1 answer
Swift extension on NSManagedObject
I could do this in Objective-C, but I'm having trouble figuring out how to make it work in Swift. I'm writing an extension on an NSManagedObject so that I can simply call a function any time I want to create a new entity. The function will then…
Louie Bertoncin
- 3,744
- 2
- 25
- 28
0
votes
1 answer
Orientation change in Swift height change and uibutton hide on landscape
I am making one custom keyboard in which when orientation of mobile is changed then in landscape i have to hide one button please suggest how can i do this i am using below code to do this task please help me.
in landscape also the button is visible…
user3151224
-1
votes
0 answers
How to call method, or method on extension that has generic type constraints?
I am trying to do something like this:
public struct FlowHStack: View where Data: RandomAccessCollection, Content: View, ID: Hashable {
let data: Data
let dataId: KeyPath
let content: (Data.Element)…
Michał Ziobro
- 10,759
- 11
- 88
- 143
-1
votes
2 answers
Can a class inherit convenience inits even if there is designated inits
I've got the following classes:
class A {
let age:Int
init(age: Int) {
self.age = age
}
}
extension A {
convenience init?(ageString: String) {
guard let age = Int(ageString) else { return nil}
…
xarly
- 2,054
- 4
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