9 NOTES IN JUNE 2020
1. The Power Of Protocol
Using Protocol Extensions for Default Implementations
example protocol with extension
protocol Printer { func printMe() } extension Printer { func printMe() { print("Hello junk food") } }
use in viewController look like
class ViewController: UIViewController { class A: Printer {} var a = A() override func viewDidLoad() { super.viewDidLoad() a.printMe() //result -> Hello junk food
} }
Source: https://medium.com/better-programming/6-swifty-ways-of-writing-code-f260286a0dbb
2. Clean Table View
- Make one class for tableView
import UIKit typealias MyStringCompletion = (String) -> Void class StaticViewDataSource: NSObject, UITableViewDelegate, UITableViewDataSource { var dataArray: [String]? var delegate: MyStringCompletion? init(items: [String]) { self.dataArray = items } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return dataArray?.count ?? 0 } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "staticcell", for: indexPath) cell.textLabel?.text = dataArray?[indexPath.row] return cell } func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) { delegate?(dataArray?[indexPath.row] ?? "") } }
And call table view in viewcontroller
import UIKit
// MARK: parent Class
class CleanTableViewController: UIViewController {
@IBOutlet var tableView: UITableView!
var datasource: StaticViewDataSource!
let arrayString = ["b89", "a131", "5rte", "54gff"]
override func viewDidLoad() {
super.viewDidLoad()
datasource = StaticViewDataSource(items: arrayString)
tableView.dataSource = datasource
tableView.delegate = datasource
datasource.delegate = { str in
print(str)
}
}
}Source: Medium
3. Permission denied "Brew install xcodegen"
I try to Intall xcodegen in terminal and response like this
'touch: /usr/local/Homebrew/.git/FETCH_HEAD: Permission denied'
so this my solution
- $sudo chown -R $(whoami) /usr/local/Homebrew/ - password: - $
now type "Brew install xcodegen" again and enter
4. Error install xcodegen in terminal
In another case my install brew error like this below
➜ ios git:(development) brew install xcodegen Updating Homebrew... Warning: You are using macOS 10.15. We do not provide support for this pre-release version. You will encounter build failures with some formulae. Please create pull requests instead of asking for help on Homebrew's GitHub, Discourse, Twitter or IRC. You are responsible for resolving any issues you experience, as you are running this pre-release version. ==> Downloading https://homebrew.bintray.com/bottles/xcodegen-2.6.0.mojave.bottle.tar.gz -=O=- # # # # curl: (7) Failed to connect to homebrew.bintray.com port 443: Operation timed out Error: Failed to download resource "xcodegen" Download failed: https://homebrew.bintray.com/bottles/xcodegen-2.6.0.mojave.bottle.tar.gz Warning: Bottle installation failed: building from source. ==> Downloading https://github.com/yonaskolb/XcodeGen/archive/2.6.0.tar.gz -=O=- # # # # curl: (7) Failed to connect to github.com port 443: Operation timed out Error: An exception occurred within a child process: DownloadError: Failed to download resource "xcodegen" Download failed: https://github.com/yonaskolb/XcodeGen/archive/2.6.0.tar.gz
And This how I fix it
- Change network connection from network office to my personal wifi
- now I can intall xcodegen
Reason: In my case because my office connection is block github or cannot open github
If succesful look like
➜ ios git:(development) brew install xcodegen Updating Homebrew... ==> Auto-updated Homebrew! Updated 4 taps (homebrew/core, homebrew/cask, dart-lang/dart and peripheryapp/periphery). ==> New Formulae abseil dynet killswitch postgresql@11 adios2 earthly kind powerline-go airshare elasticsearch@6.8 komposition prestosql alp emacs-dracula krew protobuf@3.7 ansible@2.8 ensmallen kubebuilder protoc-gen-grpc-web apollo-cli erlang@22 kumactl prover9 appium eureka kyma-cli psc-package archiver eva lanraragi publish arduino-cli faiss ...
5. Terminal do not show git branch(.oh my zsh)
In case I use .oh my zsh and don't show branch, before that I delete duplicate xcode and open terminal make my zsh not like before
so I try to reinstall .oh my zsh, but not showing git branch, and then I searchong a lot finnaly get solution
- Xcode must be swichting to xcode active
$sudo xcode-select -switch /Applications/Xcode.app/Contents/Developer6. Add. Localization file two language in xcode
- File ->. new file (select in page resource) -> Strings File
Before setting in project
- go to project setting -> tab info (section localization)
add new language
Problem :
In the condition, I want to use protocol in my viewController but except some func so a lot search
finally I found solution, create extension from your protocol in end of function give brackets "{}"
Original image
- So in your project folder look like this
After setting in project
Source: https://medium.com/lean-localization/ios-localization-tutorial-938231f9f881
7. Use localization in project
- First step in Localizable.strings write key and value like this for base language
7. Use localization in project
- First step in Localizable.strings write key and value like this for base language
"mainTitle" = "Language"; "about" = "About"; "update" = "Update"; "dateAndTime" = "Date And Time"; "storage" = "Storage";
- Next language use same keys
"mainTitle" = "ランゲージ"; "about" = "およそ"; "update" = "アップデイト"; "dateAndTime" = "日時"; "storage" = "ストレージ";
- In viewController, you can add all this code
Now you can change language in settings on device or simulator
-> go Settings -> General -> Language & Region -> iPhone Language
select language what you set in localization in xcode
import UIKit
class LanguageHelper {
static func localize(key: String) -> String {
return key.localized
}
}
struct ConstantLang {
static let language = LanguageHelper.localize(key: "mainTitle")
static let about = LanguageHelper.localize(key: "about")
}
class LocalizeLocalViewController: UIViewController {
@IBOutlet weak var mainTitle: UILabel!
@IBOutlet weak var aboutLabel: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
self.mainTitle.text = ConstantLang.language
self.aboutLabel.text = ConstantLang.about
}
}
extension String {
//MARK: Localization
var localized: String {
return NSLocalizedString(self, comment: "")
}
}
-> go Settings -> General -> Language & Region -> iPhone Language
select language what you set in localization in xcode
8. How to use git add in terminal
Before you add some git check status first ($git status)
- $git add -A -> stages all changes (git add all file change)
- $git add . -> stages new files and modifications, without deletions
- $git add -u -> stages modifications and deletions, without new files
- $git add file/common/file.swift -> (git just add single file)
9. Optional protocol
Problem :
In the condition, I want to use protocol in my viewController but except some func so a lot search
finally I found solution, create extension from your protocol in end of function give brackets "{}"
Original image
Solution:
import Foundation
public protocol SomeProtocol: class {
func didInteger(into: Int)
func didTanDis(str: String)
}
extension SomeProtocol {
func didString(str: String) {}
}
This optional is func didString(str: String) , so you use look like
extension ProtocolViewController: SomeProtocol {
func didInteger(into: Int) {
print("go to "+into.description)
}
}Source: https://stackoverflow.com/a/48838620/8366535
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