Creating a UIColor

let redColor = UIColor.redColor()
let blueColor: UIColor = .blueColor()

// In Swift 3, the "Color()" suffix is removed:
let redColor = UIColor.red
let blueColor: UIColor = .blue

let view = UIView()
  view.backgroundColor = .yellowColor()

let grayscaleColor = UIColor(white: 0.5, alpha: 1.0)

let hsbColor = UIColor(
    hue: 0.4,
    saturation: 0.3,
    brightness: 0.7,
    alpha: 1.0
)

let rgbColor = UIColor(
      red: 30.0 / 255, 
      green: 70.0 / 255, 
      blue: 200.0 / 255, 
      alpha: 1.0
  )

let patternColor = UIColor(patternImage: UIImage(named: "myImage")!)

UIColor *redColor = [UIColor redColor];

UIColor *grayscaleColor = [UIColor colorWithWhite: 0.5 alpha: 1.0];

UIColor *hsbColor = [UIColor
    colorWithHue: 0.4
    saturation: 0.3
    brightness: 0.7
    alpha: 1.0
];

UIColor *rgbColor = [UIColor
      colorWithRed: 30.0 / 255.0
      green: 70.0 / 255.0
      blue: 200.0 / 255.0 
      alpha: 1.0
  ];

UIColor *pattenColor = [UIColor colorWithPatternImage:[UIImage imageNamed:@"myImage.png"]];