依据不同情形,swift提供很多种方式对数组进行迭代

比如有如下数组：

var heros = [
    "atani J","Tirion Foordring","Salou Farr","Thrall","Tassa Dahl"
]

1. 通过变量递增的for循环

func printHeros() {
    for (var i = 0; i < heros.count; i++) {
        println(heros[i])
    }
}
printHeros()

2. 使用Range操作符

func printHeros() {
    for i in 0..<heros.count {
        println(heros[i])
    }
}
printHeros()

3. 使用enumerate进行枚举

func printHeros() {
    for (index,hero) in enumerate(heros) {
        println("\(index): \(hero)")
    }
}
printHeros()