IOS  Swift基础之switch用法详解

let name = "yangqiangyu"

switch name{
case "yangqiangyu","yqy":
  print("This is my name")
default:
  print("This is not my name");
}


//"This is my name\n"

let score = 90;

switch score{
case 0:
  print("you got an egg")
case 1..<60:
  print("you failed")
case 60:
  print("Just passed")
case 61..<80:
  print("Just so so")
case 80..<90:
  print("Good")
case 90..<100:
  print("Great")
case 100:
  print("Perfect!")
default:
  print("Error")
}

//输出结果："Great\n"

let point:(x:Int,y:Int) = (x:1,y:1)
switch point{
case (0,0):
  print("It's a origin")
case (_,0)://忽略point中的x值
  print("It's on x-axis.")
case (0,_)://忽略point中的y值
  print("It's on y-axis")
default:
  print("It's just an ordinary point")
  break
}

//输出结果：
"It's just an ordinary point\n"

let point2 = (8,0)
switch point2{
case (0,0):
  print("It's a origin")
case (let x,0)://赋值给x
  print("It's on x-axis.")
  print("The x value is \(x)")
case (0,let y)://赋值给y
  print("It's on y-axis")
  print("The y value is \(y)")
case (let x,let y):
  print("The x value is \(x)")
  print("The y value is \(y)")
}

//输出结果：
"It's on x-axis.\n"
"The x value is 8\n"

let score = 90;

switch score{
case 0:
  print("you got an egg")
case 1..<60:
  print("you failed")
case 60:
  print("Just passed")
case 61..<80:
  print("Just so so")
case 80..<90:
  print("Good")
case 90..<100:
  print("Great")
   fallthrough
case 100:
  print("Perfect!")
default:
  print("Error")
}

//输出
"Great\n"
"Perfect!\n"