• How to use CGGradientLayer

    • let layer = CGGraidentLayer()
layer.frame = CGRect.zero
layer.colors = [color1.cgcolor, color2.cgcolor, color3.cgcolor]
veiw.layer.addSublayer(layer)
    • Where is (0, 0) and (1, 1) (0,0) is the left bottom corner and (1, 1) is the right top corner
    • What is the default start point and end point (0.5, 0) -> (0.5, 1) That is middle bottom to middle top

  • How to change distance between characters

    • Use attributedString
    • kerning can affect this value
    • Kerning is 0 by default, but it doesn’t mean the distance between is 0, it means determine the distance by the font

  • How to delete app / test 3d touch on simulator

    • Touch slightly to enable edit mode on desktop
    • Touch and press down to test 3d Touch

  • How to copy text from simulator

    • Long click until the copy menu appears
    • Command + C