![]() This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions, all written for Swift 5.4. Continue Reading > About the Swift Knowledge Base When specifying colors for objects in your views, it’s often easier to use the built-in semantic colors of UIColor rather than specifying our own custom colors that might not look good in both light and dark mode. How to use semantic colors to help your iOS app adapt to dark mode ![]() Nearly all subclasses of UIView can have their background color adjusted, but often you’ll find you want to use an image rather than a flat color. ![]() How to use an image for your background color with UIColor(patternImage:) How to read the red, green, blue, and alpha color components from a UIColorĬreating a UIColor from red, green, blue, and alpha (RGBA) is easy enough. This can be done in a number of ways, but the most common is specifying individual values for red, green, blue and alpha, like this. How to create custom colors using UIColor RGB and huesĪlthough there are quite a few built-in UIColors, you'll want to create your own very frequently. Pass in a String hex value, with or without the ‘. There are 3 new & easy ways to create a color: by hex, integer RGBs, or name. If you’ve never done this before, step-by-step instructions here. Fortunately, it's easy to add an extension to UIColor that maps these names to hexadecimal color values, then add another extension to convert hex colors to UIColors. Install iColor with the Swift Package Manager. In order to change color of navigation bar for all view controllers, you have to set it in AppDelegate.swift file Add following code to didFinishLaunchingWithOptions function in AppDelegate. HTML color names let you use familiar titles like "steel blue" and "mint cream" rather than hex values, but sadly these standardized names aren't available in iOS – or at least not by default. How to convert a HTML name string into a UIColor It should be a # symbol, followed by red, green, blue and alpha in hex format, for a total of nine characters. The new method is a failable initializer, which means it returns nil if you don't specify a color in the correct format. Here's a simple extension to UIColor that lets you create colors from hex strings. UIColor Found 6 articles in the Swift Knowledge Base for this category.
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