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this RW教程以了解Swift,并且我在以下函数声明的第一行遇到错误：
func returnPossibleTips() -> [Int: Double] {
let possibleTipsInferred = [0.15,0.18,0.20]
let possibleTipsExplicit:[Double] = [0.15,0.20]
var retval = [Int: Double]()
for possibleTip in possibleTipsInferred {
let intPct = Int(possibleTip*100)
retval[intPct] = calcTipWithTipPct(possibleTip)
}
return retval
}
这些是错误：
解决方法
看起来你没有使用Swift的最新版本(beta 5),在第一版中没有数组的[Int]语法.
你可以更新Xcode或重写这段代码：
func returnPossibleTips() -> Dictionary<Int,Double> {
let possibleTipsInferred = [0.15,0.20]
let possibleTipsExplicit:Array<Double> = [0.15,0.20]
var retval = Dictionary<Int,Double>()
for possibleTip in possibleTipsInferred {
let intPct = Int(possibleTip * 100)
retval[intPct] = calcTipWithTipPct(possibleTip)
}
return retval
}