nicklockwood

Hacking UIView animation blocks for fun and profit

In this article, I'm going to explore a way that we can create views that implement custom Core Animation property animations in a natural way.

As we know, layers in iOS come in two flavours: Backing layers and hosted layers. The only difference between them is that the view acts as the layer delegate for its backing layer, but not for any hosted sublayers.

In order to implement the UIView transactional animation blocks, UIView disables all animations by default and then re-enables them individually as required. It does this using the actionForLayer:forKey: method.

Somewhat strangely, UIView doesn't enable animations for every property that CALayer does by default. A notable example is the layer.contents property, which is animatable by default for a hosted layer, but cannot be animated using a UIView animation block.

benjaminbojko

//
//  LinkedTextView.h
//
//  Created by Benjamin Bojko on 10/22/14.
//
//  The MIT License (MIT)
//
//  Copyright (c) 2014 Benjamin Bojko
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy

fousa

class FairPlayer: AVPlayer {
  
  private let queue = DispatchQueue(label: "com.icapps.fairplay.queue")
 
  func play(asset: AVURLAsset) {
    // Set the resource loader delegate to this class. The `resourceLoader`'s delegate will be 
    // triggered when FairPlay handling is required.
    asset.resourceLoader.setDelegate(self, queue: queue)
    
    // Load the asset in the player.

smileyborg

// UICollectionView Objective-C example

- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
        
    NSIndexPath *selectedIndexPath = [[self.collectionView indexPathsForSelectedItems] firstObject];
    if (selectedIndexPath != nil) {
        id<UIViewControllerTransitionCoordinator> coordinator = self.transitionCoordinator;
        if (coordinator != nil) {
            [coordinator animateAlongsideTransition:^(id<UIViewControllerTransitionCoordinatorContext> context) {

ArtFeel

//
//  CALayer+AnimationPlayback.swift
//  Created by Philip Vasilchenko on 4/27/18.
//

import UIKit

//  Pause animations of layer tree
//
//  Technical Q&A QA1673:

joeblau

#!/bin/bash
# Place this file in `.git/hooks/`

if which swiftlint >/dev/null; then
  swiftlint autocorrect
else
  echo "warning: SwiftLint not installed, download from https://github.com/realm/SwiftLint"
fi

git diff --diff-filter=d --staged --name-only | grep -e '\(.*\).swift$' | while read line; do

bwhiteley

import Foundation
import SwiftUI
#if os(macOS)
public typealias PlatformViewType = NSView
#elseif !os(watchOS)
import UIKit
public typealias PlatformViewType = UIView
#endif

#if !os(watchOS)

kamui545

#!/usr/bin/env bash

source "./dock_functions.sh"

declare -a apps=(
    '/System/Applications/Utilities/Terminal.app'
    '/System/Applications/Music.app'
    '/Applications/Google Chrome.app'
    '/Applications/PhpStorm.app'
    '/Applications/Visual Studio Code.app'

troyfontaine

Enable Visual Studio Code for Merge/Diff on Windows

From PowerShell or CMD:

cd C:\Program Files (x86)\fournova\Tower\CompareTools
code .

Edit VisualStudioCode.json and replace line 10 which is:

christianselig

import UIKit

class RootViewController: UIViewController {
    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        
        let text = "Cute cat"
        let image = UIImage(named: "cat.jpg")!
        
        // Note: you can't wrap the text and image into a single "TextImage" object and selectively return both or one as UIActivityItemSource doesn't like holding arrays