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1. Swift publisher change background how to#
2. Swift publisher change background full#
3. Swift publisher change background code#
4. Swift publisher change background free#

Here we set the label’s text color to white and background to black using system colors. MySampleColorLabel.textColor = UIColor.whiteColor() MySampleColorLabel.backgroundColor = UIColor.blackColor() Set the label's color with the System colors Getting to the code, in ViewController.swift, Add this to viewDidLoad:

Swift publisher change background code#

Make an outlet for the label by control-dragging from the label to the code in the assistant editor to make an outlet named weak var mySampleColorLabel: UILabel! If you don’t understand any of that, you might find my book Practical Autolayout very useful, though for this example you don’t need it. The segmented control I pinned to the bottom,left and right margins. I took the top slider and aligned it to the vertical center, then pinned the other teo slider to it vertically. I pinned then horizontally to the left and right margin. I aligned the Label and Button labels with a pin to the view below them and aligned them to the leading edge. I made the button one third of the height of the view by selecting equal heights between the superview and button, and then making the button have a multiplier of 1:3. Then I pinned the label and button 20 points horizontally from each other. I made the label and button of equal widths and equal heights.

For those who want to set up in auto layout, I pinned the button to the top and left margin of the view and the label to the top and right margin of the view. You can of course just drag and drop the controls, and adjust accordingly. Set up your storyboard to look something like this, with a button in the upper left and a label in the upper right: Open a new project in Xcode with a single view named SwiftColorDemo Labels and Buttons: A Color Demo Application. Beneath that, three colors that don’t fit in a RGB scheme easily: Orange, Purple, and Brown. Beneath them we have five different shades of gray. These are known as secondaries, and for RGB, those are Cyan, Magenta and Yellow, which also make up another color system CMYK which we’ll mention more in the next post. This for RGB is not surprisingly red, green and blue. There are colors we can make by equally mixing two of the primaries.

A primary color is one we base all other colors. In the illustration I organized the colors in a color wheel for the primary and secondary colors. The Apple System Colors with a color wheel of RGB primary and secondaries. There are fourteen colors and a special color clearColor which is an alpha of 0. For example, instead of the assignment above, we can type for red: let myRedColor = UIColor.redColor() There is a set of often used system colors which have their own methods.

Swift publisher change background free#

Feel free to experiment with translucency and transparency on your own. For our purposes in this post we will stick with solid colors, an alpha of 1.0. Alpha levels are the amount of transparency of a color, or how much of the color underneath we can see. Notice for a UIColor there is a fourth attribute: A for alpha. The code to make a red color would be: let myRedColor = UIColor( Xcode for the UIColor class decided to use a CGFloat between 1 and 0 instead of an integer between 0 and 255. We have three two digit numbers stuffed into one number. In hexadecimal 00 is 0 and ff is 255 in decimal. We can express red as a hexadecimal number #ff0000. The code line above is for the color red, since it is all red and no other color. The first number is red, the second green and the third blue.

Swift publisher change background full#

RGB traditionally has been a value between 0 and 255, and CSS uses this numbering pattern in one of two ways: strong /* #rrggbb */Įach of the color components can be expressed separately as a value between 0 and 255, with 255 being the full color and 0 being no color. They are also the standard color space for CSS, so any CSS web color scheme with a little work will translate into an app UI’s color scheme. As far back as the time of the Apple ][, RGB colors are easy to communicate as bytes. The most useful to most programmers is the RGB or Red-Green-Blue color system. For what most people think of as color, there are two important color identifying systems: RGB and HSB.

Swift publisher change background how to#

In the next post I’ll show you how to make colorful, well designed displays with HSB. In this post I’ll show you how to work with colors, how to use the RGB colors and how to apply them to controls in Swift with UIColor. I originally thought I would show you how to use color in one blog post, but it turned into two. I want to give you the secrets of good colors that I learned the hard way. These two examples, one a water-color of mine from 2008 and another I did with the Crayon Style App for iPhone were each done in less than six colors. I’ve painted for many years and my color blindness does not detract but actually helps me pick colors. I’m color blind, and that makes me a very good person to teach you about color and UIColor.