swift 学习记录（二）

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在switch case中，每个case分支的statements不需要用{ }包含，例如

（1）

let oneSring: String = "abc"
switch oneSring {
case "abc":
{
    print("The String is oneSring")
    let bbb = 100
    print(bbb)
    print("The String is qqq")
    print("The String is www")
    print("The String is eee")
    print("The String is sss")
    print("The String is DDD")
}
case "A":
    print("The String is A")
default:
    print("Not find String")
}

在第一个case分支，会报错：

<stdin>:17:1: error: braced block of statements is an unused closure

{

<stdin>:17:1: error: expression resolves to an unused function

{

（2）每个case分支如果有多条语句，直接换行写就可以了，

let oneSring: String = "abc"
switch oneSring {
case "abc":
    print("The String is oneSring")
    let bbb = 100
    print(bbb)
    print("The String is qqq")
    print("The String is www")
    print("The String is eee")
    print("The String is sss")
    print("The String is DDD")
case "A":
    print("The String is A")
default:
    print("Not find String")
}

输出结果为：

The String is oneSring

100

The String is qqq

The String is www

The String is eee

The String is sss

The String is DDD

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