Swift inout关键字

1、inout定义

将值类型的对象用引用的方式传递。或者说地址传递。
类似于ObjectC中的二级指针的意思

2、ObjectC中二级指针的使用

- (void)test{
    NSString *name = @"name";
    NSString *otherName = @"otherName";
    [self getName:&name otherName:&otherName];
    NSLog(@"%@ %@",name,otherName);
}
- (void)getName:(NSString **)name otherName:(NSString **)otherName{
    NSLog(@"%@ %@",*name,*otherName);
    *name = @"关羽";
    *otherName = @"武圣";
    NSLog(@"%@ %@",*name,*otherName);
}

• 打印输出

2020-11-30 16:33:39.226129+0800 Demo[43449:375299] name otherName
2020-11-30 16:33:40.778225+0800 Demo[43449:375299] 关羽 武圣
2020-11-30 16:33:42.103776+0800 Demo[43449:375299] 关羽 武圣

3、Swift中inout的使用

func test(){
        var name = "name"
        var otherName = "otherName"
        getName(name: &name, otherName: &otherName)
        print(name,otherName)
    }
    func getName(name : inout String,otherName : inout String){
        print(name,otherName)
        name = "关羽"
        otherName = "武圣"
        print(name,otherName)
    }

• 打印输出

name otherName
关羽 武圣
关羽 武圣