Xcode 8.3 and Swift 3.1 support

[saldous]

Changed M_PI and M_PI_4 to Double.pi and Double.pi / 4 to support Xcode 8.3 and Swift 3.1 changes.

[saldous]

@sudeepag any update on when you will merge this?

[ctews]

@saldous your branch has several error apparently :(

[saldous]

Odd, as you can see I only changed 2 lines of code!

Looks like other Swift 3.1 changes are needed.

[ctews]

Would you fix those errors please?

[ctews]

Don't want to hijack your effort & work :) I should've a running version here:

https://github.com/ctews/SAConfettiView

maybe your can merge in those changes into your PR branch! :)

[saldous]

import UIKit
import QuartzCore

open class SAConfettiView: UIView {
    
    public enum ConfettiType {
        case confetti
        case triangle
        case star
        case diamond
        case image(UIImage)
    }
    
    var emitter: CAEmitterLayer!
    open var colors: [UIColor]!
    open var intensity: Float!
    open var type: ConfettiType!
    fileprivate var active :Bool!
    
    required public init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
        setup()
    }
    
    public override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }
    
    func setup() {
        colors = [UIColor(red:0.95, green:0.40, blue:0.27, alpha:1.0),
                  UIColor(red:1.00, green:0.78, blue:0.36, alpha:1.0),
                  UIColor(red:0.48, green:0.78, blue:0.64, alpha:1.0),
                  UIColor(red:0.30, green:0.76, blue:0.85, alpha:1.0),
                  UIColor(red:0.58, green:0.39, blue:0.55, alpha:1.0)]
        intensity = 0.5
        type = .confetti
        active = false
    }
    
    open func startConfetti() {
        emitter = CAEmitterLayer()
        
        emitter.emitterPosition = CGPoint(x: frame.size.width / 2.0, y: 0)
        emitter.emitterShape = kCAEmitterLayerLine
        emitter.emitterSize = CGSize(width: frame.size.width, height: 1)
        
        var cells = [CAEmitterCell]()
        for color in colors {
            cells.append(confettiWithColor(color))
        }
        
        emitter.emitterCells = cells
        layer.addSublayer(emitter)
        active = true
    }
    
    open func stopConfetti() {
        emitter?.birthRate = 0
        active = false
    }
    
    func imageForType(type: ConfettiType) -> UIImage? {
        
        var fileName: String!
        
        switch type {
        case .confetti:
            fileName = "confetti"
        case .triangle:
            fileName = "triangle"
        case .star:
            fileName = "star"
        case .diamond:
            fileName = "diamond"
        case let .image(customImage):
            return customImage
        }
        
        let path = Bundle(for: SAConfettiView.self).path(forResource: "SAConfettiView", ofType: "bundle")
        let bundle = Bundle(path: path!)
        let imagePath = bundle?.path(forResource: fileName, ofType: "png")
        let url = URL(fileURLWithPath: imagePath!)
        let data = try? Data(contentsOf: url)
        if let data = data {
            return UIImage(data: data)!
        }
        return nil
    }
    
    func confettiWithColor(_ color: UIColor) -> CAEmitterCell {
        let confetti = CAEmitterCell()
        confetti.birthRate = 6.0 * intensity
        confetti.lifetime = 14.0 * intensity
        confetti.lifetimeRange = 0
        confetti.color = color.cgColor
        confetti.velocity = CGFloat(350.0 * intensity)
        confetti.velocityRange = CGFloat(80.0 * intensity)
        confetti.emissionLongitude = CGFloat(Double.pi)
        confetti.emissionRange = CGFloat(Double.pi / 4)
        confetti.spin = CGFloat(3.5 * intensity)
        confetti.spinRange = CGFloat(4.0 * intensity)
        confetti.scaleRange = CGFloat(intensity)
        confetti.scaleSpeed = CGFloat(-0.1 * intensity)
        confetti.contents = imageForType(type)!.cgImage
        return confetti
    }
    
    open func isActive() -> Bool {
        return self.active
    }
}