Swift coreanimation plus timer written by the game "aircraft Wars"

Recently in the study of Swift animation and layer, the use of what is learned to write a game, basic ideas of basic functions have been realized, the pictures are found on the Internet. Hope to help you better understand the animation and layers,

Under the statement, I am a beginner, the code is not well written. Everyone should be able to read it.

Source code Address: Click to open the link address if it doesn't work, I can fill it up.

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Swift coreanimation plus timer written by the game "aircraft Wars"