iOS 编程 : Making an arc4_random not repeat itself using a do while loop

Question

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Answer 1

这避免了直接重复:

var lastIndex = -1
var index = -1

let types = ["Alex", "Straub", "Rusher", "Graser"]

do {
    index = Int(arc4random_uniform(UInt32(types.count)))
} while index == lastIndex

println(types[index])
lastIndex = index