LeoHeo

var, let, const 차이점은?

• var는 function-scoped이고, let, const는 block-scoped입니다.

• function-scoped와 block-scoped가 무슨말이냐?

var(function-scoped)

jsfiddle 참고주소

gbitaudeau

extension Int {

    func formatUsingAbbrevation () -> String {
        let numFormatter = NSNumberFormatter()

        typealias Abbrevation = (threshold:Double, divisor:Double, suffix:String)
        let abbreviations:[Abbrevation] = [(0, 1, ""),
                                           (1000.0, 1000.0, "K"),
                                           (100_000.0, 1_000_000.0, "M"),
                                           (100_000_000.0, 1_000_000_000.0, "B")]

lynfogeek

import UIKit

extension UIImage {
    
    // colorize image with given tint color
    // this is similar to Photoshop's "Color" layer blend mode
    // this is perfect for non-greyscale source images, and images that have both highlights and shadows that should be preserved
    // white will stay white and black will stay black as the lightness of the image is preserved
    func tint(tintColor: UIColor) -> UIImage {
        

mattlawer

/*
    Copyright (C) 2016 Apple Inc. All Rights Reserved.
    See LICENSE.txt for this sample’s licensing information

    Abstract:
    `DirectoryMonitor` is used to monitor the contents of the provided directory by using a GCD dispatch source.
*/

import Foundation

vigneshr89

For a background download service with NSURLSession
1. Create a download task with background session configuration with NSURLSession delegates.
2. If, application is in foreground NSURLsession delegate will be called directly. 
3. If application is background or killed additional methods are needed in the app delegate . 
4. "handleEventsForBackgroundURLSession" will be called first, where it is necessary to reinstate the session object with the delegate again. Otherwise delegate methods will not be called. 
5. "URLSessionDidFinishEventsForBackgroundURLSession" will be called once everything is done. You can decide what you want to do once the download is complete like updating the UI. 

fuxingloh

func countLabelLines(label: UILabel) -> Int {
    // Call self.layoutIfNeeded() if your view uses auto layout
    let myText = label.text! as NSString

    let rect = CGSize(width: label.bounds.width, height: CGFloat.greatestFiniteMagnitude)
    let labelSize = myText.boundingRect(with: rect, options: .usesLineFragmentOrigin, attributes: [NSAttributedStringKey.font: label.font], context: nil)

    return Int(ceil(CGFloat(labelSize.height) / label.font.lineHeight))
}

ColinEberhardt

/// An object that has some tear-down logic
public protocol Disposable {
  func dispose()
}


/// An event provides a mechanism for raising notifications, together with some
/// associated data. Multiple function handlers can be added, with each being invoked,
/// with the event data, when the event is raised.
public class Event<T> {

willurd

Each of these commands will run an ad hoc http static server in your current (or specified) directory, available at http://localhost:8000. Use this power wisely.

Discussion on reddit.

Python 2.x

$ python -m SimpleHTTPServer 8000