Mario Negro emenegro

iOS Cell Registration & Reusing with Swift Protocol Extensions and Generics

A common task when developing iOS apps is to register custom cell subclasses for both UITableView and UICollectionView. Well, that is if you don’t use Storyboards, of course.

Both UITableView and UICollectionView offer a similar API to register custom cell classes:

public func registerClass(cellClass: AnyClass?, forCellWithReuseIdentifier identifier: String)
public func registerNib(nib: UINib?, forCellWithReuseIdentifier identifier: String)

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

	import UIKit
	import XCPlayground


	struct Episode {
	var title: String
	}

	struct Season {
	var number: Int

	# The trick is to link the DeviceSupport folder from the beta to the stable version.
	# sudo needed if you run the Mac App Store version. Always download the dmg instead... you'll thank me later :)

	# Support iOS 15 devices (Xcode 13.0) with Xcode 12.5:
	sudo ln -s /Applications/Xcode-beta.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport/15.0 /Applications/Xcode.app/Contents/Developer/Platforms/iPhoneOS.platform/DeviceSupport

	# Then restart Xcode and reconnect your devices. You will need to do that for every beta of future iOS versions

	# (A similar approach works for older versions too, just change the version number after DeviceSupport)

	// #!Swift-1.1
	import Foundation


	// MARK: - (1) classes

	// Solution 1:
	// - Use classes instead of struct
	// Issue: Violate the concept of moving model to the value layer
	// http://realm.io/news/andy-matuschak-controlling-complexity/

	typedef enum _UIBackgroundStyle {
	UIBackgroundStyleDefault,
	UIBackgroundStyleTransparent,
	UIBackgroundStyleLightBlur,
	UIBackgroundStyleDarkBlur,
	UIBackgroundStyleDarkTranslucent
	} UIBackgroundStyle;

	@interface UIApplication (UIBackgroundStyle)
	-(void)_setBackgroundStyle:(UIBackgroundStyle)style;

	// http://cocoawithlove.com/2009/10/ugly-side-of-blocks-explicit.html has a nice breakdown of the syntax--it helps to think of the ^ as similar to a pointer dereference symbol *

	// block typedef:

	typedef void(^Block)();
	typedef void(^ConditionalBlock)(BOOL);
	typedef NSString*(^BlockThatReturnsString)();
	typedef NSString*(^ConditionalBlockThatReturnsString)(BOOL);

	// block property with typedef: