because of strange color solutions in swift i needed to make customcolor class. And i dont know am i doing right.
i have a class CustomColors()
and usage: color = CustomColors().black and works perfectly
but i want to make use like: color = CustomColors(.Black)
i cant do like this:
init(_ Color: Colors)
{
switch Colors
case .Black
return UIColor(r:255,g:255,b:255,a:255)
}
A lot of things i dont know. Can someone put me on right solution? Thank you.
Instead of custom class you can use an UIColor extension with convenience initializer, as such:
extension UIColor {
convenience init(color: Colors) {
switch color {
case .black:
self.init(red: 1, green: 1, blue: 1, alpha: 1)
case .white:
self.init(red: 1, green: 1, blue: 1, alpha: 1)
}
}
}
But I think its better if you pre-define your colors using struct's static properties, as such:
struct Theme {
static let colorOne = UIColor(red: 0.952941, green: 0.952941, blue: 0.952941, alpha: 1.0) // F3F3F3
static let colorTwo = UIColor(red: 0.203922, green: 0.203922, blue: 0.203922, alpha: 1.0) // 343434
// and so on...
}
Usage
UILabel().backgroundColor = Theme.colorOne
UILabel().textColor = Theme.colorTwo
you can add extension to UIColor class with your custom colors:
import UIKit
extension UIColor {
static var mediumTurquoise: UIColor {
return UIColor(red:0.31, green:0.82, blue:0.8, alpha:1)
}
}
please be sure that the value of RGB between 0.0 and 1.0.
you can user the custom color as UIolor.mediumTurquoise
Related
I just wanted to know how to change the opacity (alpha) of an asset color I have. When I try this UIColor(named: "something", alpha: 0.4), Xcode complains: Extra argument 'alpha' in call.
Is there any way I can modify the opacity of an asset color programmatically?
UIColor, as mentioned by Jasur S., has the withAlphaComponent(_:).
It can be used with any UIColor objects to modify its alpha:
let color = UIColor(named: "something")?.withAlphaComponent(0.5)
Creating custom extensions to cover existing functionality is an arguable good.
You can add this extension for UIColor and easy to use.
extension UIColor {
convenience init?(named: String, alpha: CGFloat) {
if let rgbComponents = UIColor(named: named)?.cgColor.components {
self.init(red: rgbComponents[0], green: rgbComponents[1], blue: rgbComponents[2], alpha: alpha)
} else {
self.init(named: named)
}
}
}
Usage:
let colorWithAlpha = UIColor(named: "Assets Color", alpha: 0.5)
You can set color alpha component when you assign color as follows:
button.backgroundColor = .black.withAlphaComponent(0.5)
You can modify asset color from here
Select that particular asset color and
Drag that opacity indicator in left or right or directly set some values
Use this extension to get the rgb value from the UIColor
extension UIColor {
var rgba: (red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat) {
var red: CGFloat = 0
var green: CGFloat = 0
var blue: CGFloat = 0
var alpha: CGFloat = 0
getRed(&red, green: &green, blue: &blue, alpha: &alpha)
return (red, green, blue, alpha)
}
}
Then you can create a new color
let assetColor = UIColor(named: "something")
let (r,g,b,_) = assetColor.rgba
let newColor = UIColor(red:r, green:g, blue:b, alpha: 0.4)
In my app, I have for example 5 available colors for different Task that user can choose between them anytime. I thought it would be good to have a class of color and I declare few colors inside the class that in any controller I can access to those colors as an Array. For example when I want to show the colors to pickup, I want them as an array. But I don't know how to do that? I create a class but in the init part, I don't know how to add colors
final class Colors {
var color : [UIColor]
init(color: [UIColor]) {
}
}
Your help will be appreciated.
Extend UIColor, make your colors static properties, and make your array a computed static property.
Option 1 - You can extend UIColor to list all of your colors and create an array:
extension UIColor {
struct GoTimeThemes {
static let firstColor = UIColor(red: 48.0/255.0, green: 35.0/255.0, blue: 174.0/255.0, alpha: 1.0)
static let secondColor = UIColor(red: 83.0/255.0, green: 160.0/255.0, blue: 263.0/255.0, alpha: 1.0)
static let thirdColor = UIColor(red: 146.0/255.0, green: 80.0/255.0, blue: 156.0/255.0, alpha: 1.0)
static var allColors: [UIColor] {
let colors = [firstColor, secondColor, thirdColor]
return colors
}
}
}
And call your array like so
let colors = UIColor.GoTimeThemes.allColors
Option 2 - You can put your colors in an Enum that conforms to CaseIterable:
enum ThemeColors: CaseIterable {
case firstTheme, secondTheme, thirdTheme
var color: UIColor {
switch self {
case .firstTheme:
return UIColor(red: 48.0/255.0, green: 35.0/255.0, blue: 174.0/255.0, alpha: 1.0)
case .secondTheme:
return UIColor(red: 83.0/255.0, green: 160.0/255.0, blue: 263.0/255.0, alpha: 1.0)
case .thirdTheme:
return UIColor(red: 146.0/255.0, green: 80.0/255.0, blue: 156.0/255.0, alpha: 1.0)
}
}
}
And call it with allCases to get a Collection:
ThemeColors.allcases //→ [firstTheme, secondTheme, thirdTheme]
I thought it would be good to have a class of color and I declare few colors inside the class that in any controller I can access to those colors as an Array.
An enumeration would work well for this. The set of colors is fixed, right? It sounds like you won't need distinct instances of the set of colors, and it'd probably be nice to be able to access the colors without needing to create an object or bother with sharing an object. An enumeration gives you a set of discrete values, and it can have methods associated with it. For example, you could have a darkGreen value, and then methods like uiColor() and cgColor() that return UIColor and CGColor objects that correspond to that value.
I've created NSWindow and made it's background colour absolutely blue (#0000FF). But when the window is rendered, the colour is "lighter" than it should be (#0F3FFB).
class LilWindow: NSViewController {
override func viewDidLoad() {
self.view.window?.backgroundColor =
NSColor.init(red: 0, green: 0, blue: 1, alpha: 1)
}
Does anyone know why it is happening and how to fix this? (screenshot attached)
Okay, so after a couple of hours fiddling with code and #KenThomases help, I figured out that if you want your RGB colours to looks correctly on NSImages and NSWindows, you must convert it into NSDeviceRGBColorSpace colorspace. To do this I've written a simple function:
func toScreenColor(color:NSColor) -> NSColor {
var red: CGFloat = 0, green: CGFloat = 0, blue: CGFloat = 0, alpha: CGFloat = 0
color
.colorUsingColorSpaceName(NSCalibratedRGBColorSpace)!
.getRed(&red, green: &green, blue: &blue, alpha: &alpha)
return NSColor(deviceRed: red, green: green, blue: blue, alpha: alpha)
}
This question already has answers here:
How to change dynamically color used in UIStoryboard
(2 answers)
Closed 4 years ago.
How do I set, let's say a text color on a UILabel, to a color defined in one of my classes like:
func mainAppColor() -> UIColor {
return UIColor(red: 0.2, green: 0.3, blue: 0.4, alpha: 1)
}
or
let mainAppColor = UIColor(red: 0.2, green: 0.3, blue: 0.4, alpha: 1)
in storyboard.
If your method is declared in some other class like:
class TextColorClass {
func mainAppColor() -> UIColor {
return UIColor(red: 0.2, green: 0.3, blue: 0.4, alpha: 1)
}
}
Then you can use it by make instance of that class this way:
let classInstance = TextColorClass()
yourLBL.textColor = classInstance.mainAppColor()
If it is declared like:
class TextColorClass {
let mainAppColor = UIColor(red: 0.2, green: 0.3, blue: 0.4, alpha: 1)
}
Then you can use it like:
let classInstance = TextColorClass()
yourLBL.textColor = classInstance.mainAppColor
If that method is declare in same class suppose in ViewController class then you can use it this way:
override func viewDidLoad() {
super.viewDidLoad()
yourLBL.textColor = mainAppColor()
}
func mainAppColor() -> UIColor {
return UIColor(red: 0.2, green: 0.3, blue: 0.4, alpha: 1)
}
UPDATE:
If you want to set any property from storyboard you can use #IBInspectable as shown in below example code:
import UIKit
#IBDesignable
class PushButtonView: UIButton {
#IBInspectable var fillColor: UIColor = UIColor.greenColor()
#IBInspectable var isAddButton: Bool = true
override func drawRect(rect: CGRect) {
}
}
And assign this class to your button.like shown into below Image:
And if you go to the Attribute Inspector you can see custom property for that button.
Now you can set it as per your need.
For more Info refer this tutorial:
http://www.raywenderlich.com/90690/modern-core-graphics-with-swift-part-1
I have a swift class, in which I am trying to pass a default value for a function parameter:
class SuperDuperCoolClass : UIViewController {
// declared a constant
let primaryColor : UIColor = UIColor(red: 72.0/255.0, green: 86.0/255.0, blue: 114.0/255.0, alpha: 1.0)
// compilation error at below line: SuperDuperCoolClass.Type does not have a member named 'primaryColor'
func configureCheckmarkedBullet(bullet: UIButton, color: UIColor = primaryColor){
// some cool stuff with bullet and primaryColor
}
}
As stated above, if I try to use constant as default value for function parameter, compiler complains with below error:
SuperDuperCoolClass.Type does not have a member named 'primaryColor'
but if I assign the RHS value directly like this, it does not complain :-/ :
func configureCheckmarkedBullet(bullet: UIButton, color: UIColor = UIColor(red: 72.0/255.0, green: 86.0/255.0, blue: 114.0/255.0, alpha: 1.0)) {
// now I can do some cool stuff
}
Any ideas on how can I silence the above compilation error?
You have to define the default value as a static property:
class SuperDuperCoolClass : UIViewController {
static let primaryColor : UIColor = UIColor(red: 72.0/255.0, green: 86.0/255.0, blue: 114.0/255.0, alpha: 1.0)
func configureCheckmarkedBullet(bullet: UIButton, color: UIColor = primaryColor){
}
}
The above code compiles with Swift 1.2 (Xcode 6.3) which added support
for static computed properties. In earlier versions, you can define
a nested struct containing the property as a workaround (compare
Class variables not yet supported):
class SuperDuperCoolClass : UIViewController {
struct Constants {
static let primaryColor : UIColor = UIColor(red: 72.0/255.0, green: 86.0/255.0, blue: 114.0/255.0, alpha: 1.0)
}
func configureCheckmarkedBullet(bullet: UIButton, color: UIColor = Constants.primaryColor){
}
}
Since primaryColor is an instance variable it cannot be accessed until an instance is created from this class and since the function is part of the class definition you will get this error as primaryColor cannot access at that time.
You can either use MartinR approach or use your approach with the desired color:
func configureCheckmarkedBullet(bullet: UIButton, color: UIColor = UIColor(red: 72.0/255.0, green: 86.0/255.0, blue: 114.0/255.0, alpha: 1.0)) {
// now I can do some cool stuff
}