2018.08.31 10:57 swift 学习心得

　　其实我一直很喜欢swift，我觉得Xcode很先进，买了一台MacBook就可以操作了，蛮好的。

var str = "Hello, playground"
var myVariable =
myVariable =
let myConstant =
let implicitInteger =
let implicitDouble = 70.0
let explicitDouble: Double =
let label = "The width is "
let width =
let widthLabel = label + String(width)
let apples =
let oranges =
let appleSummary = "I have \(apples) apples."
let fruitSummary = "I have \(apples + oranges) pieces of fruit."

swift代码