這里對Playground進(jìn)行下介紹，Playground是用于快速開發(fā)和調(diào)試的，開發(fā)好后要把這些代碼要移到項(xiàng)目中。當(dāng)然也可以用來學(xué)習(xí)Swift。下面這段是蘋果網(wǎng)站對Playground的介紹。

Playgrounds enable the interactive experience of a script language, even though Swift compiles to highly-optimized native code. Type a line of code and the result appears immediately. If your code runs through a loop, add that line of code to the timeline assistant editor to watch its progression. Display variables in a graph, inspect each step when drawing a view, or watch an animated SpriteKit scene. When you’ve perfected your code in the playground, simply move it into your project. Playgrounds documentation includes tutorials that you can open in a playground, providing an interactive worksheet for experimentation.