chenr2

How do I get that frosted glass gaussian blur?

The Storyboard has views Visual Effect View with Blur and Visual Effect View with Blur and Vibrancy. You can almost treat this like empty views.

So if you wanted a login dialog box that came up as a modal, but blur the background:

• The login dialog box would have its own View Controller
• Open the login dialog box as a modal
• Make sure the modal segue is Over Current Context so the screen below doesn't vanish
• Add a Visual Effect View with Blur behind your other views, serving as a background

chenr2

Disallow rotation for onboarding

Assumptions:

• You're using UIPageViewController for onboarding
• You have an UIViewController with a container that embeds the UIPageViewController
• You present this UIViewController modally

The UIViewController container lets you do two things:

chenr2

How to make a view circular

imageView.layer.cornerRadius = imageView.bounds.size.width / 2

chenr2

Getting videos from a YouTube playlist

This is the Jay Chou Playlist I want videos from:

https://www.youtube.com/playlist?list=PL50C17441DA8A565D

YouTube's API explorer has a playlist endpoint:

https://developers.google.com/youtube/v3/docs/playlistItems/list

chenr2

Demo of the Network Starter Kit

See Network Starter Kit.

This is the script for Tuesday's Columbia iOS meetup.

Some basics

Object	Contains

chenr2

The keyboard keeps obscuring my content

TODO: WIP. Need to test next time I integrate this.

See Greg Heo's video ScrollView tutorial on raywenderlich.com.

Text boxes can get covered up by the keyboard, especially on 3.5 inch screens (4s). The first step is to embed the page contents inside a UIScrollView.

@IBOutlet weak var scrollview: UIScrollView!

chenr2

How to make a thread-safe singleton

See http://krakendev.io/blog/the-right-way-to-write-a-singleton

This creates a new User if necessary, or uses the existing one.

class User {
    static let sharedInstance = User()
 var name = "Bruce"

chenr2

How to tell if two things are the same

You want to iterate over an array of custom objects, and need to tell whether two objects are equal. You're not concerned with two objects being identical in memory, but equivalent based on your own definition.

class Student {
    var studentId = 0
    var firstName = "Bob"
}

chenr2

How to count characters in a string

Just use count

count(textView.text!)

chenr2

How to stringify JSON

This assumes you have SwiftyJSON.

Start with a Dictionary

let paramsDictionary = [
    "title": "foo",
 "description": "bar"