swift 学习记录（二）

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