@readme.markdown

#Broken Rendering Bad swift code that (weirdly) compiles fine, seems to break IB live rendering.

Zipped framework and application examples below.

http://cl.ly/1l1a353F2b0P

AppDelegate.swift

//
//  AppDelegate.swift
//  BrokenRenderingApp
//
//  Created by Jerry Jones on 6/7/14.
//  Copyright (c) 2014 Spaceman Labs, Inc. All rights reserved.
//

import UIKit

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
                            
	var window: UIWindow?

	func soConfused() -> CGFloat
	{
		return 0.0
	}

	func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: NSDictionary?) -> Bool {

    // Unlike the playground, this code all executes fine
		var foo: CGFloat = 0.0
		var bar: Float = 0.0
		
		foo = soConfused()
		bar = soConfused()
		println("test \(foo)")
		println("test \(bar)")

		return true
	}
}

BrokenView.swift

//
//  BrokenView.swift
//  BrokenRenderingFramework
//
//  Created by Jerry Jones on 6/7/14.
//  Copyright (c) 2014 Spaceman Labs, Inc. All rights reserved.
//

import UIKit

@IBDesignable

class BrokenView: UIView {

	@IBInspectable var borderColor: UIColor = UIColor.blueColor()
	
    init(frame: CGRect) {
        super.init(frame: frame)
        // Initialization code
    }

	override func drawRect(rect: CGRect)
	{
		let context = UIGraphicsGetCurrentContext()
		var frame = self.frame
		CGContextSetLineWidth(context, 10.0)
		CGRectInset(frame, 5.0, 5.0)
		borderColor.set()
		UIRectFrame(frame)
		
		// This same code compiles fine, but breaks live rendering in IB
		var foo: CGFloat = 0.0
		var bar: Float = 0.0
		
		foo = soConfused()
		bar = soConfused()
		println("test \(foo)")
		println("test \(bar)")
	}
	
	func soConfused() -> Float
	{
		return 0.0
	}
	
}

foo.playground

// Playground - noun: a place where people can play

import UIKit

func soConfused() -> CGFloat
{
	return 0.0
}

var foo: CGFloat = 0.0
var bar: Float = 0.0

foo = soConfused()
bar = soConfused() // Fails here: 'NSNumber' is not a subtype of 'Float'
println("test \(foo)")
println("test \(bar)")

You can do this here:

bar = Float(soConfused())