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import UIKit
import PlaygroundSupport

public extension UIColor {
    public func hsba() -> (hue: CGFloat, saturation: CGFloat, brightness: CGFloat, alpha: CGFloat)? {
        var hue: CGFloat = .nan, saturation: CGFloat = .nan, brightness: CGFloat = .nan, alpha: CGFloat = .nan
        guard self.getHue(&hue, saturation: &saturation, brightness: &brightness, alpha: &alpha) else {
            return nil
        }
        return (hue: hue, saturation: saturation, brightness: brightness, alpha: alpha)

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Types

A type is a collection of possible values. An integer can have values 0, 1, 2, 3, etc.; a boolean can have values true and false. We can imagine any type we like: for example, a HighFive type that allows the values "hi" or 5, but nothing else. It's not a string and it's not an integer; it's its own, separate type.

Statically typed languages constrain variables' types: the programming language might know, for example, that x is an Integer. In that case, the programmer isn't allowed to say x = true; that would be an invalid program. The compiler will refuse to compile it, so we can't even run it.

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Git Cheat Sheet

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Commands

Getting Started

git init

or

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#!/bin/bash

#
# Updates all plug-ins to be compatible with the latest Xcode and Xcode-beta
#

plugins_location="~/Library/Application\ Support/Developer/Shared/Xcode/Plug-ins"

# Get Xcode's version
current_xcode_version="$(defaults read /Applications/Xcode.app/Contents/Info DVTPlugInCompatibilityUUID)"

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func measure(prefix: String = "Time Taken", closure:()->()) {
  let a = CFAbsoluteTimeGetCurrent()
  closure()
  let b = CFAbsoluteTimeGetCurrent()
  let m = ((b-a) * 1000.0)
  print("\(prefix): \(m) ms")
}

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UIStatusBarStyle in iOS 7

• The status bar in iOS 7 is transparent, the view behind it shows through.

• The style of the status bar refers to the appearances of its content. In iOS 7, the status bar content is either dark (UIStatusBarStyleDefault) or light (UIStatusBarStyleLightContent). Both UIStatusBarStyleBlackTranslucent and UIStatusBarStyleBlackOpaque are deprecated in iOS 7.0. Use UIStatusBarStyleLightContent instead.

How to change UIStatusBarStyle

• If below the status bar is a navigation bar, the status bar style will be adjusted to match the navigation bar style (UINavigationBar.barStyle):

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//
//  BinaryDataScanner.m
//
//  Copyright 2009 Dave Peck <davepeck [at] davepeck [dot] org>. All rights reserved.
//  http://davepeck.org/
//
//  This class makes it quite a bit easier to read sequential binary files in Objective-C.
//
//  This code is released under the BSD license. If you use it in your product, please
//  let me know and, if possible, please put me in your credits.

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/node_modules
/public/storage
/storage/*.key
/vendor
Homestead.yaml
Homestead.json
.env

# ====== OS X ===========================================
.DS_Store

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#import <Foundation/Foundation.h>

// typedef
typedef NSString*(^ConvertBlock)(NSString *text);

@interface Thing : NSObject
@property (nonatomic, strong) void (^coolPropertyBlock)(NSString *text); // Property

// method param
- (void)doSomething:(void(^)(NSString *text))block with:(NSString *)person;

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- (IBAction)handleTap:(id)sender
{
   BOOL isHiding = !_statusBarHidden;
   _statusBarHidden = isHiding;
   
   [UIView animateWithDuration:UINavigationControllerHideShowBarDuration delay:0 options:0
                    animations:^{
                       [self setNeedsStatusBarAppearanceUpdate];
                    }
                    completion:NULL];