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HeaderView.swift
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HeaderView.swift
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//
// HeaderView.swift
//
// Created by TheFlow_ on 18/10/2015.
// Copyright © 2015 TheFlow_. All rights reserved.
//
import UIKit
@IBDesignable
class HeaderView: UIView {
@IBInspectable var blurStyle: UIBlurEffectStyle = .Light {
didSet {
updateHeaderBackground()
}
}
@IBInspectable var image: UIImage? {
didSet {
updateHeaderBackground()
}
}
private lazy var headerBackground: UIImageView! = {
let headerBackground = UIImageView()
headerBackground.translatesAutoresizingMaskIntoConstraints = true
headerBackground.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
headerBackground.image = self.image
headerBackground.contentMode = .ScaleAspectFill
headerBackground.frame = self.bounds
let visualEffectView = UIVisualEffectView(effect: UIBlurEffect(style: self.blurStyle))
visualEffectView.translatesAutoresizingMaskIntoConstraints = true
visualEffectView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
if self.image != nil {
visualEffectView.frame = headerBackground.bounds
headerBackground.addSubview(visualEffectView)
}
return headerBackground
}()
// whenever a property that effects the header view changes, call this
//
private func updateHeaderBackground() {
headerBackground.removeFromSuperview()
headerBackground = nil
addSubview(headerBackground)
}
override init(frame: CGRect) {
super.init(frame: frame)
translatesAutoresizingMaskIntoConstraints = false
clipsToBounds = true
addSubview(headerBackground)
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}