In Python, I can create a repeating list like this:
>>> [1,2,3 ]*3
[1, 2, 3, 1, 2, 3, 1, 2, 3] Is there a concise method in Swift?
The best thing I can do is:
1> var r = [Int]()
r
Category: Swift
Swift, a new development language released by Apple at WWDC (Apple Developer Conference) in 2014, can run on Mac OS and iOS platforms together with Objective-C* to build applications based on the Apple platform. Swift is an easy-to-learn and easy-to-use programming language, and it is also the first system programming language with the same expressiveness and fun as a scripting language. Swift is designed with safety as the starting point to avoid various common programming error categories.
Swift – weak self in Didset
I rarely see people using [weak self] in didSet. Is there a reason?
I tried to use [weak self] in the didSet of the variable:
var data: Dictionary! {// [1]
didSet {[2]
self?.layoutSub
Swift’s use of closed bag
The simplest way to write closures, here is the format {(parameters) -> return type in
statements
}
Examples
//let append = {(str1 aa:String ,Str2 bb: String)-> String in error, the c
SWIFT: How to use PreProcessor Flags to implement API keys?
In Objective-C, static string constants are sometimes used to define alternate API keys (for example, the RELEASE and DEBUG keys to distinguish analysis packages, such as MixPanel, Flurry or Crashl
SWIFT Basic Syntax – Data Type
Common Swift data types value type enum Optional structure (Struct) Bool, Int, Float, Double, Character String, Array, Dictionary, Set reference type class class
Sw The use of ift’s
Quickly try question mark
I see the following in the code I maintain:
func parse(values: NSMutableDicationary) {
let data = try? JSONSerialization.data(withJSONObject: values, options: JSONSerialization.WritingOption
Array – MAX and MIN in Float arrays in SWIFT
According to this answer, to get the maximum value of the array, we can do:
let nums = [1, 6, 3, 9, 4, 6];
let numMax = nums.reduce(Int.min, {max($0, $1) }) How do we do for Array< Float> The
SWIFT – Change the map type (mixed, satellite) by segmentation control
I am trying to use the segment control button to change the map type, I hope it can use 3 options to change the map type: standard, satellite and hybrid. So far, I have this code but Once a differe
swift – tvOS Button Action
I created a UIButton in tvOS via Swift
let randomBtn = UIButton()
randomBtn. setTitle(“Zufällig”, forState: .Normal)
let RndNormal = UIImage(named: “RndNormal”)
let RndHoover = UIImage(named:
Array – How do you write all strings in an array?
I have an array of strings, but all the jingle is written in uppercase letters. Is there a way for me to set all the strings in the array to lowercase (and use uppercase and lowercase) )
arra