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1. The Layer Tree

Core Animation's original name is Layer Kit

Core Animation is a compositing engine; its job is to compose different pieces of visual content on the screen, and to do so as fast as possible. The content in question is divided into individual layers stored in a hierarchy known as the layer tree. This tree forms the underpinning for all of UIKit, and for everything that you see on the screen in an iOS application.

In UIView, tasks such as rendering, layout and animation are all managed by a Core Animation class called CALayer. The only major feature of UIView that isn’t handled by CALayer is user interaction.

There are four hierarchies, each performing a different role:

• view hierarchy
• layer tree

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import Foundation

// Create a method that will be called instead of
// "bundleIdentifier()" that returns a non-empty
// bundle id, even for a CLI script
extension NSBundle {
    func fakeBundleIdentifier() -> NSString {
        if self == NSBundle.mainBundle() {
            return "dont.mind.me.totally.a.normal.bundleid"
        } else {

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// Inspired by: http://stackoverflow.com/a/5314634/9849
// Simplified if-statements
// Updated to "modern" syntax
// Support optional CLHeading
// Support degree-of-precision
//
// This dictionary should then be added to the normal
// metadata using the kCGImagePropertyGPSDictionary key
- (NSDictionary *)GPSDictionaryForLocation:(CLLocation *)location heading:(CLHeading *)heading
{

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# Get the already-processed Info.plist, which has our bundleId, etc.
processedInfoPlistFile=$TARGET_BUILD_DIR/$INFOPLIST_PATH
# Copy the bundle identifier from our processed Info.plist
bundleId=$(/usr/libexec/PlistBuddy -c "Print :CFBundleIdentifier" "$processedInfoPlistFile")
# Prefix it with "group." to make the application group container id
appGroupContainerId=group.$bundleId

# Get the already-copied Settings.bundle/Root.plist
appPackageFolder=$TARGET_BUILD_DIR/$EXECUTABLE_FOLDER_PATH
copiedSettingsBundlePlistFile=$appPackageFolder/Settings.bundle/Root.plist

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// Say this is in your app delegate

- (void) attemptAutologin
{
    NSURL *autologinURL = ...some..url..that..does..autologin..on..your..server
    self.safariViewController = [[SFSafariViewController alloc] initWithURL:autologinURL];
    self.safariViewController.modalPresentationStyle = UIModalPresentationOverFullScreen;
    self.safariViewController.view.alpha = 0.0;
    [self.window.rootViewController presentViewController:self.safariViewController
                                                 animated:NO

rsattar

import Foundation

// Create a method that will be called instead of
// "bundleIdentifier()" that returns a non-empty
// bundle id, even for a CLI script
extension NSBundle {
    func fakeBundleIdentifier() -> NSString {
        if self == NSBundle.mainBundle() {
            return "dont.mind.me.totally.a.normal.bundleid"
        } else {

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- (void) setImage:(UIImage *)image
{
    [super setImage:image];

    if (self.lk_heightConstrainedToAspectWidth && self.image) {
        CGFloat imageAspectRatio = self.image.size.height / self.image.size.width;
        // If we haven't constrained ourself, or the constraint needs updating
        if (!self.aspectRatioHeightConstraint || self.aspectRatioHeightConstraint.multiplier != imageAspectRatio) {
            [self setNeedsUpdateConstraints];
        }

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// Requires Security.framework on Cocoa and Cocoa-Touch
#import <CommonCrypto/CommonDigest.h>

- (NSString *)avoSigFromUserEmailHash:(NSString *)userEmailHash developerKey:(NSString *)developerKey developerId:(NSString *)developerId
{
    
    NSString *combo = [userEmailHash stringByAppendingString:developerKey];
    unsigned char result[CC_SHA256_DIGEST_LENGTH];
    const char *combined = [combo UTF8String];
    CC_SHA256(combined, [combo lengthOfBytesUsingEncoding:NSUTF8StringEncoding], result);

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// Sometimes Socket.IO "batches" up messages in one packet,
// so we have to split them.
// 
- (NSArray *)packetsFromPayload:(NSString *)payload
{
    // "Batched" format is:
    // �[packet_0 length]�[packet_0]�[packet_1 length]�[packet_1]�[packet_n length]�[packet_n]
    

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autologin = TRUE

googleLogin = TRUE

• When version > 3.5: FALSE

barName = Hello World!

foo = FALSE