Nib Support

gistfile1.txt

/*

ericasadun.com
Playground Support for NIB-based interaction: Add to playground's Sources folder

*/

import Cocoa
import XCPlayground

/// Generate a playground-specific command-line request to compile the xib file
public func DisplayCompileCommand() {
    let path = NSBundle.mainBundle().bundlePath.stringByAppendingPathComponent("Contents/Resources")
    println("cd \"\(path)\"; ibtool --compile MainMenu.nib MainMenu.xib")
}

/// Delegate root class
public class Delegate : NSObject {} ; public var delegate = Delegate()

/// Read in nib to item array. Use NSBundle vs UINib/NSNib to avoid playground crashes
public func LoadItemArrayFromNib() -> NSArray {
    var itemArray = NSArray()
    var itemArrayPointer = AutoreleasingUnsafeMutablePointer<NSArray?>(&itemArray)
    NSBundle.mainBundle().loadNibNamed("MainMenu", owner: nil, topLevelObjects: itemArrayPointer)
    return itemArray
}

/// Fetch item by class
public func SelectTypedItemFromArray<T>(type t: T.Type, array: NSArray) -> T? {
    for eachItem in array {
        if let typedItem = eachItem as? T {
            return typedItem
        }
    }
    return nil
}

/// Playground-accessible global nib item array
public var nibItemArray = LoadItemArrayFromNib()

/// Playground-accessible global main window
public var window : NSWindow! = SelectTypedItemFromArray(type: NSWindow.self, nibItemArray)

/// Playground-accessible global content view for main window
public var contentView = window.contentView as! NSView

/// Fetch view by tag and class from contentView
public func FetchView<T>(type t: T.Type, tag: Int = 0, contentView: NSView = contentView) -> T? {
    if tag != 0 {
        // When the tag is specified, the subview must match that tag
        if let view : T = contentView.viewWithTag(tag) as? T {return view}
    } else {
        // When the tag is 0 or unspecified, find by type using depth-first recursion
        for eachItem in contentView.subviews {
            if let view = eachItem as? T {return view}
            if let subview = FetchView(type: t.self, tag:0, contentView:eachItem as! NSView) {
                return subview
            }
        }
    }
    return nil
}

/// Load nib and establish playground runloop
public func Launch() {
    XCPSetExecutionShouldContinueIndefinitely(continueIndefinitely: true)
    window.level = 7
    NSApplication.sharedApplication().setActivationPolicy(.Regular)
}

/* updated example of retrieving topLevelObjects from loaded nib, for Swift 4 */

var itemArray = NSArray()
let itemArrayPointer = AutoreleasingUnsafeMutablePointer<NSArray?>(&itemArray)
Bundle.main.loadNibNamed("MainMenu", owner: nil, topLevelObjects: itemArrayPointer)

// print contents of toplevelobjects
print(itemArray)