bennagar

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

Array

Definition:

• Stores data elements based on an sequential, most commonly 0 based, index.
• Based on tuples from set theory.

bennagar

/** Add to plist 
'UIFileSharingEnabled' = YES
'Bundle display name' = $(PRODUCT_NAME)
*/

var filePath:URL? = {
    return FileManager.default.urls(for: .documentDirectory, in: .userDomainMask).first?.appendingPathComponent("file.txt")
}()

"TEST".write(to: filePath, atomically: true, encoding: .UTF8)

bennagar

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        let showAlertButton = UIButton(type: UIButtonType.Custom)
        showAlertButton.frame = CGRectMake(0, 0, 100, 40)
        showAlertButton.setTitle("Show Alert", forState: .Normal)

bennagar

extension UIColor{
    convenience init (hexString:String) {
        let cleanString = hexString.stringByTrimmingCharactersInSet(NSCharacterSet.alphanumericCharacterSet().invertedSet)
        
        var rgbValue = UInt32()
        NSScanner(string: cleanString).scanHexInt(&rgbValue)
        let a,r,g,b:UInt32
        
        switch cleanString.characters.count{
        case 3: // RGB (12-bit)