Kiran Kunigiri kirankunigiri

Creating a "DMG installer" for OS X

A DMG Installer is convenient way to provide end-users a simple way to install an application bundle. They are basically a folder with a shortcut to the Applications directory but they can be customized with icons, backgrounds, and layout properties. A DMG file (.dmg) is a Mac OS X Disk Image file and it is used to package files or folders providing compression, encryption, and read-only to the package.

##Creating the DMG file #Disk Utility

	import UIKit

	class EMCollectionViewFlowLayout: UICollectionViewFlowLayout {

	override func targetContentOffsetForProposedContentOffset(proposedContentOffset: CGPoint, withScrollingVelocity velocity: CGPoint) -> CGPoint {
	var _proposedContentOffset = CGPoint(x: proposedContentOffset.x, y: proposedContentOffset.y)
	var offSetAdjustment: CGFloat = CGFloat.max
	let horizontalCenter: CGFloat = CGFloat(proposedContentOffset.x + (self.collectionView!.bounds.size.width / 2.0))

	let targetRect = CGRect(x: proposedContentOffset.x, y: 0.0, width: self.collectionView!.bounds.size.width, height: self.collectionView!.bounds.size.height)

	-- Ask the user to select an app
	set theApp to choose file of type "app" default location (path to applications folder)

	-- Get the app name
	tell application "System Events"
	set theAppName to name of theApp
	if theAppName ends with ".app" then set theAppName to text 1 thru -5 of theAppName

	-- Determine whether the app is a package, and notify the user if it's not
	set isPackage to (package folder of theApp)