我正在为if语句中的单个变量设置多个整数测试.逻辑运算符不能工作,因为它们必须是布尔值.
例如：
if self.nodeAtPoint(location) == self.fake {
groundspeed = 35.0
self.button1value++
if(button1value == 2) {
groundspeed = 5.0
}
if(button1value == 4){
groundspeed = 5.0
}
if(button1value == 6) {
groundspeed = 5.0
}
}
目标是将所有偶数显示在一个if语句中.
如果我们只想检查button1value是否为偶数,我们可以使用模(％)运算符：
if button1value % 2 == 0 {
// button1value is even
groundspeed = 5.0
}
如果我们检查一些其他类型的集合,我们可以使用switch语句：
switch button1value {
case 2,4,6:
// button1value is 2,or 6
groundspeed = 5.0
default:
// button1value is something else
}
如果我们想要的话,我们也可以使用Swift的switch语句来做其他整洁的技巧：
switch (button1value % 2,button1value % 3) {
case (0,0):
// button1value is an even multiple of 3 (6,12,18...)
case (0,_):
// button1value is an even number not a multiple of three (2,8,10,14...)
case (_,0):
// button1value is an odd multiple of three (3,9,15,21...)
default:
// button1value is none of the above: (1,5,7,11...)
}
