Linh Vo dlsolution

Objects for working with Date in Swift's Foundation framework:

Date: This is a struct that represents a specific point in time independent of any calendar or time zone. It has methods for creating dates, comparing dates and calculating time intervals between dates. It is not responsible for the date format or conversions between string and date.
DateFormatter: It provides methods for converting Date to String and String to Date. You can customise the date string using predefined styles in DateFormatter.Style or create your own custom format.
DateComponents: This is a Date or Time object represented in units such as the year, month, day, minute or hour in a particular calendar. It provides direct access to different parts of a date or time.

Resources

http://ios-tutorial.com/working-dates-swift/

General iOS, CS questions and interview prep resources.

Raywenderlich Swift Interview Questions and Answers
iOS Interview Questions for Senior Developers (useful even if you're not senior yet)
Swift Interview Tips by Sean Allen
My Approach to Learning iOS

Async semantics proposal for Swift

Modern Cocoa development involves a lot of asynchronous programming using blocks and NSOperations. A lot of APIs are exposing blocks and they are more natural to write a lot of logic, so we'll only focus on block-based APIs.

Block-based APIs are hard to use when number of operations grows and dependencies between them become more complicated. In this paper I introduce asynchronous semantics and Promise type to Swift language (borrowing ideas from design of throw-try-catch and optionals). Functions can opt-in to become async, programmer can compose complex logic involving asynchronous operations while compiler produces necessary closures to implement that logic. This proposal does not propose new runtime model, nor "actors" or "coroutines".

FastScrollingCollectionView

UICollectionView with optimized smooth scrolling and improved performance.

I expect that you use this when you want to add UICollectionView displaying images to your app.

Tips

1. Cache image

We can use SDWebImage. Standing on the shoulders of giants.

Performance Tips

Cancelling unnecessary downloading tasks

Once a downloading task initialized, even when you set another URL to the image view, that task will continue until finishes.

imageView.kf.setImage(with: url1) { result in 
 // `result` is `.failure(.imageSettingError(.notCurrentSourceTask))`

WWDC18 Notes - Session 416 - iOS Memory Deep Dive

All session list link: Here
Session Link: Here
Demo starts @ 25:30 in the video.
Download session slides: Here

This notes is written by Sheldon after watching WWDC18 session 416. You can find me with #iOSBySheldon in Github, Youtube, Facebook, etc.

	// https://medium.com/@samermurad555/ios-provisional-notifications-eeb3832836fc

	import UserNotifications
	import UIKit

	typealias GrantCb = (_ didGrant: Bool) -> Void

	// Manages Notifications Permissions
	class NotificationManager {
	static let instance = NotificationManager()