leoniralves

<?php

  function substring_format($value='', $local)
	{
		$substring = substr_replace($value, '-'.(substr($value, strlen($value)-$local, 4)),strlen($value)-$local, 4);	

		if (substr($substring, 4, 1) != '-') {
			
			return substring_format($substring, $local+5);

leoniralves

po [[UIWindow keyWindow] _autolayoutTrace] // prints layouts ambiguity
po [view constraintsAffectingLayoutForAxis:0] // horizontal
po [view constraintsAffectingLayoutForAxis:1] // vertical

[view hasAmbiguousLayout] // BOOL
[view exerciseAmbiguityInLayout] // visualizing ambiguity

viewController.extendedLayoutIncludesOpaqueBars = NO;
viewController.automaticallyAdjustsScrollViewInsets = NO;
viewController.edgesForExtendedLayout = UIRectEdgeNone;

leoniralves

Local SSL websites on Mac OSX

These instructions will guide you through the process of setting up local, trusted websites on your own computer.

These instructions are intended to be used on Mac OSX Yosemite.

NOTE: You may substitute the edit command for nano, vim, or whatever the editor of your choice is. Personally, I forward edit to Sublime Text:

alias edit="/Applications/Sublime\ Text.app/Contents/SharedSupport/bin/subl"

leoniralves

struct Person {
    let name: String
    let lastname: String
}

class Reflection {
    func printProperties(mirror: _MirrorType) {
        for i in 0..<mirror.count {
            let (name, childMirror) = mirror[i]
            let value = childMirror.value

leoniralves

import Foundation

protocol ExchangeRate {
    var value: Double { get }
}

extension ExchangeRate {
    func businessTaxCalculated() -> Double {
        return value*(1.5/100)
    }

leoniralves

import Foundation

protocol ExchangeProtocol {
    var value: Double { get }
}

protocol Taxable {
    var value: Double { get }
    func calculated(exch: ExchangeProtocol) -> Double
}

leoniralves

import Foundation

protocol Cacheable {  
    associatedtype Key
    associatedtype Object
    
    func set(key: Key, object: Object)
    func get(key: Key) -> Object?
}

leoniralves

import Foundation

/*
 "Method swizzling is the process of changing the implementation of an existing selector.
 It’s a technique made possible by the fact that method invocations in Objective-C can be
 changed at runtime, by changing how selectors are mapped to underlying functions in a
 class’s dispatch table."
 Source: https://nshipster.com/method-swizzling/
 
 "This is only possible because in Objective-C the method to call when a message is sent

leoniralves

func getDocumentsDirectory() -> URL {
    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    return paths[0]
}

func writeOnFile(str: String) {
    let filename = getDocumentsDirectory().appendingPathComponent("output.txt")

    do {
        if FileManager.default.fileExists(atPath: filename.path), let data = "\(str)\n".data(using: .utf8) {

leoniralves

import Foundation

protocol AsyncDispatcher {
    func async(
        group: DispatchGroup?,
        qos: DispatchQoS,
        flags: DispatchWorkItemFlags,
        execute work: @escaping @convention(block) () -> Void
    )
    func async(execute work: @escaping @convention(block) () -> Void)