Swift 5.x 中 break跳出循环

var number: Int = 10

loop: while number > 0 {
    switch number {
    case 10:
        var sum = 0
        for index in 0...8 {
            print(index)
            sum += index
            if index == 5 {
                print(sum)
                break loop
            }
        }
    default:
        break
    }
}

输出结果:

0
1
2
3
4
5
15

注: 不设置标签, 通过指定标签break, 在palyground下不会跳出循环