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Кто подставил
Барбару Лисков?
Сергей Крапивенский, Rambler&Co
или Кто кого SOLID?
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“Do Not Learn Frameworks”
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Фундаментальные знания
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Фундаментальные знания
Язык
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Фундаментальные знания
Язык
Фреймворки
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Фундаментальные знания
Язык
Фреймворки
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RayWenderlich - driven development
Senior ReactiveCocoa Developer
Рамблер - секта VIPER
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Фундаментальные знания
Язык
Фреймворки
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Фундаментальные знания
Язык
Фреймворки
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Фундаментальные знания
Язык
Фреймворки
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Фундаментальные знания
• Структуры данных
• Алгоритмы
• Паттерны
• DRY, KISS, YAGNI
• SOLID
• И многое другое
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No content
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Single responsibility principle
Open-closed principle
Liskov substitution principle
Interface segregation principle
Dependency inversion principle
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Single Responsibility Principle
“A class should have only one
reason to change”
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MassiveViewController
1.Ответственности сильно связаны
2.Класс перестает помещаться в голове
3.Тяжело поддерживать и тестировать
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UITableViewController
1.Изменение логики работы с таблицей
2.Поменять иерархию вьюшек
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UITableViewController
Решение проблемы: не использовать его
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Запуск приложения
Push Notifications
Quick Actions
Уведомления о
состояниях приложения
Открытие по URL
Фоновая
загрузка данных
AppDelegate
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AppDelegate
Запуск приложения Quick Actions
Поиск
Push Notifications
Открытие URL
Состояния
приложения
Загрузка в фоне
Handoff
Extensions
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AppDelegate
Запуск приложения Quick Actions
Поиск
Push Notifications
Открытие URL
Состояния
приложения
Загрузка в фоне
Handoff
Extensions
https://github.com/rambler-digital-solutions/RamblerAppDelegateProxy
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SRP о снижении сложности
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Single responsibility principle
Open-closed principle
Liskov substitution principle
Interface segregation principle
Dependency inversion principle
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Open-Closed Principle
“Software entities (classes,
modules, functions, etc.) should be
open for extension, but closed for
modification”
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Простой и устойчивый
дизайн
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Новость
Новость
Новость
Новость
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Новость
Новость
Новость
Новость
Новость с фото
Новость с фото
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Новость
Новость
Новость
Новость
Новость с фото
Новость с фото
Реклама
Реклама
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} else ...
return cell
}
func tableView(_ tableView: UITableView,
cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier:
"SomeIdentifier")! as UITableViewCell
let model = self.models[indexPath.row]
if (model is News) {
let newsCell: NewsCell? = (cell as? NewsCell)
newsCell?.setup(withNews: model as! News)
}
else if (model is Advertisement) {
let adCell: AdvertisementCell? = (cell as?
AdvertisementCell)
adCell?.setup(withAd: model as! Advertisement)
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} else ...
return cell
}
func tableView(_ tableView: UITableView,
cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier:
"SomeIdentifier")! as UITableViewCell
let model = self.models[indexPath.row]
if (model is News) {
let newsCell: NewsCell? = (cell as? NewsCell)
newsCell?.setup(withNews: model as! News)
}
else if (model is Advertisement) {
let adCell: AdvertisementCell? = (cell as?
AdvertisementCell)
adCell?.setup(withAd: model as! Advertisement)
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} else ...
return cell
}
func tableView(_ tableView: UITableView,
cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier:
"SomeIdentifier")! as UITableViewCell
let model = self.models[indexPath.row]
if (model is News) {
let newsCell: NewsCell? = (cell as? NewsCell)
newsCell?.setup(withNews: model as! News)
}
else if (model is Advertisement) {
let adCell: AdvertisementCell? = (cell as?
AdvertisementCell)
adCell?.setup(withAd: model as! Advertisement)
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} else ...
return cell
}
func tableView(_ tableView: UITableView,
cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier:
"SomeIdentifier")! as UITableViewCell
let model = self.models[indexPath.row]
if (model is News) {
let newsCell: NewsCell? = (cell as? NewsCell)
newsCell?.setup(withNews: model as! News)
}
else if (model is Advertisement) {
let adCell: AdvertisementCell? = (cell as?
AdvertisementCell)
adCell?.setup(withAd: model as! Advertisement)
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} else ...
return cell
}
func tableView(_ tableView: UITableView,
cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier:
"SomeIdentifier")! as UITableViewCell
let model = self.models[indexPath.row]
if (model is News) {
let newsCell: NewsCell? = (cell as? NewsCell)
newsCell?.setup(withNews: model as! News)
}
else if (model is Advertisement) {
let adCell: AdvertisementCell? = (cell as?
AdvertisementCell)
adCell?.setup(withAd: model as! Advertisement)
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func tableView(_ tableView: UITableView, cellForRowAt indexPath:
IndexPath) -> UITableViewCell {
let model: CellObject = self.models[indexPath.row] as!
CellObject
let cell = tableView.dequeueReusableCell(withIdentifier:
"CellIdentifier")! as! ConfigurableCell
cell.configure(withObject: model)
return cell as! UITableViewCell
}
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NewsCell PhotoCell AdCell
func configure(withObject: CellObject)
News Photo Advert
func cellClass() -> AnyClass
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Когда применять?
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No content
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Single responsibility principle
Open-closed principle
Liskov substitution principle
Interface segregation principle
Dependency inversion principle
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No content
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Liskov Substitution Principle
“Subtypes must be substitutable for
their base types”
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Нужен для проверки
корректности наследования
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func hideViews() {
UIView.animate(withDuration: 1.0,
animations: {
for view in self.animatableViews {
view.alpha = 0.5
}
})
}
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UIView
UIVisualEffectView
Всё ок !
is being asked to animate its
opacity. This will cause the effect to appear broken until
opacity returns to 1
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¯\_(ツ)_/¯
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Single responsibility principle
Open-closed principle
Liskov substitution principle
Interface segregation principle
Dependency inversion principle
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Interface Segregation Principle
“Clients should not be forced to
depend on methods that they
do not use”
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MailAPIClient
- auth
- findContact
- getMailboxes
- createMailbox
- sendMail
Auth Contacts Mailboxes Messages
- auth
- findContact
- getMailboxes
- createMailbox
- sendMail
- auth
- findContact
- getMailboxes
- createMailbox
- sendMail
- auth
- findContact
- getMailboxes
- createMailbox
- sendMail
- auth
- findContact
- getMailboxes
- createMailbox
- sendMail
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AuthService
MailboxService
ContactService
MessageServic
e
Auth Contacts Mailboxes Messages
- auth
- findContact
- getMailboxes
- createMailbox
- sendMail
- auth
- findContact
- getMailboxes
- createMailbox
- sendMail
- auth
- findContact
- getMailboxes
- createMailbox
- sendMail
- auth
- findContact
- getMailboxes
- createMailbox
- sendMail
MailAPIClient
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ISP - это не SRP
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- sendSelfDestructMessage
- deleteBothMessages
ChatChannel
- loadMessages
- sendMessage
- replyToMessage
- forwardMessage
Channel
SecretChat Supergroup
- banUser
Group
- loadMessages
- sendMessage
- replyToMessage
- forwardMessage
- sendSelfDestruct
- deleteBoth
- pinMessage
- banUser
- pinMessage - loadMessages
- sendMessage
- replyToMessage
- forwardMessage
- sendSelfDestruct
- deleteBoth
- pinMessage
- banUser
- loadMessages
- sendMessage
- replyToMessage
- forwardMessage
- sendSelfDestruct
- deleteBoth
- pinMessage
- banUser
- loadMessages
- sendMessage
- replyToMessage
- forwardMessage
- sendSelfDestruct
- deleteBoth
- pinMessage
- banUser
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Single responsibility principle
Open-closed principle
Liskov substitution principle
Interface segregation principle
Dependency inversion principle
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Dependency Inversion Principle
“A. High-level modules should not
depend on low-level modules. Both
should depend on abstractions”
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Dependency Inversion Principle
“B. Abstractions should not depend
on details. Details should depend
on abstractions”
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func displayNews() {
let newsPredicate = NSPredicate(...)
let filteredNews = News.findAll() as! [News]
// Отображаем новости
}
Зависимость от Core Data
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NewsViewController MagicalRecord
Realm
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protocol NewsProvider {
func obtainNewsForDate(date: NSDate) -> [News]
}
Зависимость от Core Data
func displayNews() {
let date = NSDate.init()
let filteredNews = self.newsProvider?.obtainNewsForDate(date:
date)
// Отображаем новости
}
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protocol NewsProvider {
func obtainNewsForDate(date: NSDate) -> [News]
}
Зависимость от Core Data
func displayNews() {
let date = NSDate.init()
let filteredNews = self.newsProvider?.obtainNewsForDate(date:
date)
// Отображаем новости
}
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class ViewController: UIViewController {
init(newsProvider : NewsProvider) {
self.newsProvider = newsProvider
super.init(nibName: "ViewController", bundle: nil)
}
}
Зависимость от Core Data
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NewsViewController
MagicalRecord
NewsProvider
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Зависимости инвертированы #
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Серебряной пули нет
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- Оноре де Бальзак
“Обстоятельства переменчивы,
принципы - никогда”
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Спасибо!
serkrapiv
sergey.krapivenskiy
rambler-ios