I just wanted to know why there are two ways to obtain color in iOS. I am new to Swift and Objective C development, I just want to know how and why they are different?
Why there is CGColor when we already have UIColor in IOS? If they are different then what is the difference between them?
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CGColorcomes from a lower level thanUIColor. This difference is not so obvious in Swift anymore, but you may see this in Objective-C whereUIColoris an Objective-C class with methods whileCGColoris a C type and you access it with C functions.UIColoris part of the UIKit which is based on Core Graphics, whereCGColorbelongs to. While UIKit is for iOS (and tvOS), Core Graphics is for macOS and iOS, and you may share code for Core Graphics between both.Roughly speaking, Core Graphics is for drawing while UIKit and its macOS pendant AppKit are for GUI display.