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http://mandarapte.com/apple/set-background-color-uiimage-swift-programming-language-developing-app-ios-xcode-addition-list-uicolor-predefined-preset-component-values-xcode-dot-operator/
Here is how to set a background color in UIimage using Swift Programming Language while developing app for iOS in Xcode. With addition to this here is list of UIColor predefined / preset component values in Xcode that you can use using dot operator