SwiftDevHints

Requirements

• iOS 10.0+ / macOS 10.12+ / watchOS 4.0+
• Swift 5

Installation

Tapticc is available through CocoaPods. To install it, simply add the following line to your Podfile:

pod 'SwiftDevHints'

Usage

• String Extensions
• Collection Optional Extensions
• Optional Extensions
• Collection Extensions
• UITableView Extensions
• UserDefaults Extensions
• UIColor Extensions
• Bundle Extensions
• Date Extensions

String Extensions

The safe way to return string slice

let string = "Hello, Swift!"
string[safe: 0..<5]  // "Hello"
string[safe: 0...4]  // "Hello"
string[safe: 0..<14] // nil

intBaseHex Get int value form hex string

print("FF".intBaseHex)  // 255
print("0xFF".intBaseHex)  // 255

trimmed()

" hello world \n\t".trimmed()  // "hello world"

trimming()

var string = " hello world \n\t"
string.trimming()
string  // "hello world"

isBlank

" \n\t ".isBlank  // true

nilIfEmpty

"".nilIfEmpty  // nil

Collection Optional Extensions

isNilOrEmpty

"".isNilOrEmpty  // true
([] as? [String]).isNilOrEmpty  // true

Optional Extensions

isNone & isSome

"hello".isNone  // false
"hello".isSome  // true

var name: String? = nil
name.isNone  // true
name.isSome  // false

noneDo & someDo

var name: String? = nil

name.noneDo {
    print("name is nil")
}

name.someDo {
    print("name has a value \($0)")
}

Collection Extensions

The safe way to return element at specified index

let animals = ["Zebra", "Giraffe", "Tiger"]
let zebra = animals[safe: 0] // "Zebra"
let lion = animals[safe: 3] // nil

UITableView Extensions

Register & Dequeue UITableViewCell

class UserCell: UITableViewCell, NibReusable { }

tableView.register(UserCell.self)
let cell: UserCell = tableView.dequeueReusableCell(for: indexPath)

UICollectionView Extensions

Register & Dequeue UICollectionViewCell

class PhotoCell: UICollectionViewCell, NibReusable { }

collectionView.register(PhotoCell.self)
let cell: PhotoCell = collectionView.dequeueReusableCell(for: indexPath)

UserDefaults Extensions

A safe way to use UserDefaults

extension UserDefaults.Name {
    static let username: UserDefaults.Name = "SwiftDevHints-Demo.Username"
    static let password: UserDefaults.Name = "SwiftDevHints-Demo.Password"
}

// Register Initial Value
UserDefaults.standard.register(defaults: [.username: "Unknown"])

// Set Value
UserDefaults.standard.set("Derek", forName: .username)
UserDefaults.standard.set("12345", forName: .password)

// Get Value
let username = UserDefaults.standard.string(forName: .username)
let password = UserDefaults.standard.string(forName: .password)

UIColor Extensions

Initialize UIColor with RGB based 255

let color = UIColor(red: 255, green: 32, blue: 171)

Initialize UIColor with RGB Hex String

let color = UIColor(hexString: "FF20AB") 

Create a black or white UIColor object that constrasts to specified color.

let color = UIColor(constrastingBlackOrWhiteColorOn: UIColor.green)

Get hexadecimal value string of this color (start with "#")

let hexString = UIColor.red.hexString // #FF0000

Get RGB or HSBA components

let rgb = UIColor.red.rgbComponents // (red: 255, green: 0, blue: 0)
let rgba = UIColor.red.rgbaComponents // (red: 1.0, green: 0.0, blue: 0.0, alpha: 1.0)
let hsba = UIColor.red.hsbaComponents // (hue: 0.0, saturation: 1.0, brightness: 1.0, alpha: 1.0)

Get random color

let randomColor = UIColor.random

Bundle Extensions

Convenient methods to access Info.plist

let bundle = Bundle.main

let displayName = bundle.displayName
let identifier = bundle.identifier
let version = bundle.version
let build = bundle.build

// All keys
private enum InfoPlistKey: String {
case name = "CFBundleName"
case displayName = "CFBundleDisplayName"
case developmentRegion = "CFBundleDevelopmentRegion"
case identifier = "CFBundleIdentifier"
case version = "CFBundleShortVersionString"
case build = "CFBundleVersion"
case packageType = "CFBundlePackageType"
}

Date Extensions

Some convenient methods

let today = Date()                   // December 17, 2017 at 5:54:46 PM GMT+8
let startOfToday = today.startOfDay  // December 17, 2017 at 12:00:00 AM GMT+8
let endOfToday = today.endOfDay      // December 17, 2017 at 11:59:59 PM GMT+8
let previousDay = today.previousDay  // December 16, 2017 at 5:54:46 PM GMT+8
let nextDay = today.nextDay          // December 18, 2017 at 5:54:46 PM GMT+8

// December 14, 2017 at 5:54:46 PM GMT+8
// December 15, 2017 at 5:54:46 PM GMT+8
// December 16, 2017 at 5:54:46 PM GMT+8
let last3Days = today.lastDays(withCount: 3, includingToday: false)

// December 17, 2017 at 5:54:46 PM GMT+8
// December 18, 2017 at 5:54:46 PM GMT+8
// December 19, 2017 at 5:54:46 PM GMT+8
let next3Days = today.nextDays(withCount: 3, includingToday: true)

References

• https://github.com/Luur/SwiftTips#1-safe-way-to-return-element-at-specified-index
• https://github.com/onevcat/Kingfisher
• https://github.com/AliSoftware/Reusable
• https://github.com/andyyhope/nemo

Author

• Twitter: @derekcoder_
• Weibo: @derekcoder
• Email: derekcoder@gmail.com

License

SwiftDevHints is released under the MIT license. See LICENSE for details.