gillygize

//: A UIKit based Playground for presenting user interface
  
import UIKit
import PlaygroundSupport

class MyViewController : UIViewController {
    lazy var view1: UIView = {
      let view = UIView()
      view.backgroundColor = .red
      return view

gillygize

import Foundation
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

/* Transactions - Why?

- Influenced by databases (all of the operations succeed or fail together)
- Implement undo functionality
- Multithreaded

gillygize

#import <CoreImage/CoreImage.h>

@interface RedFilter : CIFilter
@property (strong, nonatomic) CIImage *inputImage;
@end

@implementation RedFilter
- (CIColorKernel *)myKernel {
  static CIColorKernel *kernel = nil;
  static dispatch_once_t once;

gillygize

# Requires having a property on the view controller called "activeField" which
# will be centered inside remaining space.

- (void)keyboardWasShown:(NSNotification*)aNotification {
  NSDictionary* info = [aNotification userInfo];
  CGSize kbSize = [[info objectForKey:UIKeyboardFrameBeginUserInfoKey] CGRectValue].size;
  CGFloat kbDuration = [[info objectForKey:UIKeyboardAnimationDurationUserInfoKey] floatValue];
  UIViewAnimationOptions kbAnimationCurve = [[info objectForKey:UIKeyboardAnimationCurveUserInfoKey] integerValue];

  CGRect aRect = self.view.frame;