swift colorpicker 스위프트 컬러피커
//
// ViewController.swift
// ColorPicker
//
// Created by stayfoolish on 29/09/2018.
// Copyright © 2018 stayfoolish. All rights reserved.
//
import UIKit
class ViewController: UIViewController {
private struct ColorComponent {
typealias SliderTag = Int
typealias Component = Int
static let count: Int = 4
static let red: Int = 0
static let green: Int = 1
static let blue: Int = 2
static let alpha: Int = 3
static func tag(`for`: Component) -> Int {
return `for` + 100
}
static func component(from: SliderTag) -> Component {
return from - 100
}
}
private struct ViewTag {
static let sliderRed: Int = 100
static let sliderGreen: Int = 101
static let sliderBlue: Int = 102
static let sliderAlpha: Int = 103
}
@IBOutlet weak var colorView: UIView!
@IBOutlet weak var pickerView: UIPickerView!
private let rgbStep: Float = 255.0
private let numberOfRGBStep: Int = 256
private let numberOfAlphaStep: Int = 11
@IBAction func sliderValueChanged(_ sender: UISlider) {
guard (ViewTag.sliderRed...ViewTag.sliderAlpha).contains(sender.tag) else {
print("wrong slider tag")
return
}
let component: Int = ColorComponent.component(from: sender.tag)
let row: Int
if component == ColorComponent.alpha {
row = Int(sender.value * 10)
}else {
row = Int(sender.value)
}
self.pickerView.selectRow(row, inComponent: component, animated: false)
self.matchViewColorWithCurrentValue()
}
override func viewDidLoad() {
super.viewDidLoad()
for i in 0..<self.pickerView.numberOfComponents{
let numberOfRows: Int = self.pickerView.numberOfRows(inComponent: i)
self.pickerView.selectRow(numberOfRows - 1 , inComponent: i, animated: false)
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
private func matchViewColorWithCurrentValue(){
guard let redSlider: UISlider = self.view.viewWithTag(ViewTag.sliderRed) as? UISlider,
let greenSlider: UISlider = self.view.viewWithTag(ViewTag.sliderGreen) as? UISlider,
let blueSlider: UISlider = self.view.viewWithTag(ViewTag.sliderBlue) as? UISlider,
let alphaSlider: UISlider = self.view.viewWithTag(ViewTag.sliderAlpha) as? UISlider
else{
return
}
// UIColor의 Red, Green, Blue, Alpha 값은 0과 1 사이의 실수 값
let red: CGFloat = CGFloat(redSlider.value / self.rgbStep)
let green: CGFloat = CGFloat(greenSlider.value / self.rgbStep)
let blue: CGFloat = CGFloat(blueSlider.value / self.rgbStep)
let alpha: CGFloat = CGFloat(alphaSlider.value)
let color: UIColor = UIColor(red: red, green: green, blue: blue, alpha: alpha)
self.colorView.backgroundColor = color
}
}
extension ViewController: UIPickerViewDelegate, UIPickerViewDataSource{
func numberOfComponents(in pickerView: UIPickerView) -> Int {
return ColorComponent.count
}
func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
if component == ColorComponent.alpha {
return self.numberOfAlphaStep
}else {
return self.numberOfRGBStep
}
}
func pickerView(_ pickerView: UIPickerView, titleForRow row: Int, forComponent component: Int) -> String? {
if component == ColorComponent.alpha {
return String(format: "%1.1lf", Double(row) * 0.1)
}else {
return "\(row)"
}
}
func pickerView(_ pickerView: UIPickerView, didSelectRow row: Int, inComponent component: Int) {
let sliderTag: Int = ColorComponent.tag(for: component)
guard let slider: UISlider = self.view.viewWithTag(sliderTag) as? UISlider else {
return
}
if component == ColorComponent.alpha {
slider.setValue(Float(row) / 10.0 , animated: false)
}else {
slider.setValue(Float(row), animated: false)
}
self.matchViewColorWithCurrentValue()
}
}
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