Extensions add new functionality to an existing class, structure, or enumeration type.
Apple Pre-release Docs
Questions tagged [swift-extensions]
394 questions
1
vote
1 answer
Widespread Swift Protocol for Extensions
Widespread Protocol for Extensions
Swift 4.1, Xcode 9.3
I was wondering, what are some of the most overarching protocols in Swift. I want to make an extension that applies to values that can be set. The purpose of this was to make it easier to write…
Noah Wilder
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- 38
1
vote
4 answers
Generic `getText()` function for UI elements in Swift
For a lot of actions, I need to check if the content of label.text, textView.text, textField.text etc. is nil.
So I created some extensions:
extension UILabel {
func getText() -> String {
return self.text ?? ""
}
}
extension…
kuzdu
- 7,124
- 1
- 51
- 69
1
vote
0 answers
websites blocking through Content Blocking in Swift
I am creating an app where I want to block few websites by using Content Blocking Extension in Swift.
If you guys have any idea to block websites through an app please suggest something.
yberry
- 11
- 2
1
vote
0 answers
Swift 4: type(of: self) differs when using private/fileprivate
I implemented an extension to NSObject to get the dynamic type of my objects:
extension NSObject {
var dynamic_type : String {
get {
return String(describing: type(of: self))
}
}
}
This works perfectly for…
user7246017
1
vote
1 answer
Can't extend extension added structs on swift
I have CustomClass like so:
class CustomClass {
let attribute: Int
}
In another file I've added it a StructureA via extension like so:
extension CustomClass {
struct StructureA {
let someData: Int
}
}
In a third file, I'm…
Lucas Pereira
- 569
- 1
- 11
- 23
1
vote
0 answers
NSAttributedString swift extension is not accessable in Objective C
I have created a swift extension for NSAttributedString.
import Foundation
extension NSAttributedString {
public func trimming(_ charSet: NSCharacterSet) -> NSAttributedString {
let modifiedString =…
Madu
- 4,849
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- 78
1
vote
1 answer
Error claims a protocol is a generic type, but no generics are used
I am wishing to implement a pattern similar to Notification.Name where anyone can add one later via an extension, like this:
Swift 4
public protocol Foo {
var bar: String { get }
}
public struct FooImpl: Foo {
public let bar:…
Ky -
- 30,724
- 51
- 192
- 308
1
vote
2 answers
How can I translate this utility function into an extension function?
I wrote this utility function in Swift 4:
func insert(_ value: Element, into dictionary: inout [Key : Set], at key: Key) {
if let _ = dictionary[key] {
dictionary[key]?.insert(value)
}
else {
var…
Ky -
- 30,724
- 51
- 192
- 308
1
vote
1 answer
Use an extension to extend multiple classes
I am using a tableview datasource extension as shown below. I want to apply this extension to multiple tableview controllers in my app. I can't see any simple way to allow a single generic extension to extend multiple classes without copy & pasting…
lozflan
- 835
- 10
- 23
1
vote
1 answer
Importing only specific extensions from a module
Say I have some extension in module A:
public extension String {
func foo() { ... }
}
In module B, I would like to sometimes import individual extensions (or files), just like I can import struct, import enum, ...
Neither of
import struct…
Raphael
- 9,779
- 5
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- 94
1
vote
1 answer
Why we use Extension?
As we have Object Oriented Programming, so we can make parent class which have all the functions those are needed for all child classes. so what is the purpose of extensions? I'm little bit confused in that question, please anyone help me.
Muhammad Ahmed Baig
- 726
- 14
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1
vote
0 answers
Xcode markup/documentation not working
I created an extension and added a description using ///
extension Array where Element: UIView {
/// Remove each view from its superview.
func removeViewsFromSuperview(){
self.forEach{ $0.removeFromSuperview() }
}
}
However,…
14wml
- 4,048
- 11
- 49
- 97
1
vote
1 answer
Generic IBDesginables UIView extension
I would like to create generic extension for class to add some designables functionality to any UIView subclass and by this avoid adding functionality to all subclasses. So, would be nice to add extension for UIView which conforms to protocol…
Paulius Vindzigelskis
- 2,121
- 6
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- 41
1
vote
1 answer
In Swift, can you write an extension which returns a typed instance of the class the extension is on?
This is one of those things that seems simple enough, but doesn't work as you'd expect.
I'm working on a 'fluent/chaining'-style API for my classes to allow you to set properties via functions which can be chained together so you don't have to go…
Mark A. Donohoe
- 28,442
- 25
- 137
- 286
1
vote
1 answer
Derive type for extension's static func
I want to make a method to return all NSManagedObject of a specific class as an extension:
extension NSManagedObject {
static func getAll() -> [NSManagedObject]? {
// code
}
}
How can I specify the exact type of returned objects? So,…
Casey Monta
- 13
- 2