• How to change key binding when using a normal keyboard in MacOS

    • Preference -> Keyboard -> Modifier keys
    • Exchange Command and option
    • Of course you can also change other keys like Control, Caps Lock, Fn here
    • property: UIDataDectorTypes
    • Change this property to what you like: .link, .address, .calendarEvent, .shipmentTrackingNumber, .FlightNumber, .lookupSuggestion, .all

  • How to handle click of the dectected types in UITextView

    • Implete method in UITextViewDelegate
    • iOS10 and later
    • TextView(:shouldInteractWithURL:inRange:interaction:)
      • return false and handle by yourself
      • or just return true
    • There are 3 kinds of interaction:
      • .default
      • .present
      • .preview

  • How to change double to string with formate

    • let s = String(formate:”%.2f”, 0.019)

  • How to draw a rect with round corner in context

    • Normal way
      • context.beginPath
      • move
      • drawToPoint
    • Easy way
      • Using UIBezierPath
      • In this way, drawing rect with round corner is just like new a view and set its layer’s cornerRadius 
        //Don't forget set path fillColor and strokeColor before stroke or fill
let path = UIBezierPath(rounderRect:cornerRadius:)
path.stroke()
path.fill()

  • How to capture several variables in closure in Swift

    • [weak v1, weak v2]

  • Hot to make image in button fill button even if image is smaller than button’s size

    btn.contentVerticalAlignment = .fill
btn.contentHorizontaolAlignment = .fill

  • How to bind credit card to Japanese Apple ID

    • Get a credit card with JCB, CMB JCB card in my case
    • Make sure it is ready for purchasing as Apple will try to make a bill of $0.01 when binding
    • On Mac OS, enable VPN of Japanese VPS
    • Enable global proxy
    • Open iTunes and login your Japanese App Store account
    • In account detail, edit payment method and input your JCB card info
    • Your card will have a $0.01 bill and then all is done