FadeInOut.swift

// 
//  FadeInOut.swift
// 
// 
//  Usage
//  フェードイン
//  完了タイミングで何かしたい場合はクロージャーも記述
//  FadeView.fadeIn(type: .Slow) { [weak self] in
//      println("FadeIn 完了")
//  }
// 
import Foundation
import UIKit

enum FadeType: NSTimeInterval {
    case
    Normal = 0.2,
    Slow = 1.0
}

extension UIView {

    func fadeIn(type: FadeType = .Normal, completed: (() -> ())? = nil) {
        fadeIn(type.rawValue, completed: completed)
    }
    /** For typical purpose, use "public func fadeIn(type: FadeType = .Normal, completed: (() -> ())? = nil)" instead of this */
    func fadeIn(duration: NSTimeInterval = FadeType.Slow.rawValue, completed: (() -> ())? = nil) {
        alpha = 0
        hidden = false
        UIView.animateWithDuration(duration,
            animations: {
                self.alpha = 1
            }) { finished in
                completed?()
        }
    }
    
    
    func fadeOut(type: FadeType = .Normal, completed: (() -> ())? = nil) {
        fadeOut(type.rawValue, completed: completed)
    }
    /** For typical purpose, use "public func fadeOut(type: FadeType = .Normal, completed: (() -> ())? = nil)" instead of this */
    func fadeOut(duration: NSTimeInterval = FadeType.Slow.rawValue, completed: (() -> ())? = nil) {
        UIView.animateWithDuration(duration
            , animations: {
                self.alpha = 0
            }) { [weak self] finished in
                self?.hidden = true
                self?.alpha = 1
                completed?()
        }
    }
    
}