随机选择一个插座并设置其他插座

Question

我有一个随机选择 UIButton 并将其字符设置为特定表情符号的功能。我现在想将剩余的 UIButtons 设置为随机表情符号。

我如何确定哪些UIButtons 不是随机生成器设置的值？

我还想确保分配的值与随机生成器中插入的值不同。

@IBOutlet weak var topLeftAnswer: UIButton!
@IBOutlet weak var topRightAnswer: UIButton!
@IBOutlet weak var bottomLeftAnswer: UIButton!
@IBOutlet weak var bottomRightAnswer: UIButton!

 func correctAnswerGen() {
    var correct: UInt32 = arc4random_uniform(4)
    switch correct{
    case 0: topLeftAnswer.setTitle("", forState: UIControlState.Normal)
    case 1: topRightAnswer.setTitle("", forState: UIControlState.Normal)
    case 2: bottomLeftAnswer.setTitle("", forState: UIControlState.Normal)
    case 3: bottomRightAnswer.setTitle("", forState: UIControlState.Normal)
    default: break
    }
    //assign other 3 buttons to another emoji value.
}

Answer 1

要设置随机表情符号，您可以循环 0x1F601...0x1F64F，然后 select 随机表情符号，例如：

var rand: UInt32 = arc4random_uniform(78)

for i in 0x1F601...0x1F64F {
    if rand == i {
          var c = String(UnicodeScalar(i))
          print(c)
          break
    }
}

但是由于有更多的表情符号，您将不得不使用类似这样的东西来遍历所有表情符号：

let allEmojis = [
    0x1F601...0x1F64F,
    0x2702...0x27B0,
    0x1F680...0x1F6C0,
    0x1F170...0x1F251
]

var rand: UInt32 = arc4random_uniform(544)
var counter = 0
for range in allEmojis {
    for i in range {
        if rand == counter
        {
            var c = String(UnicodeScalar(i))
            print(c)
        }
        counter++
    }
}

Answer 2

同样的事情简化了：

func randomEmoji() -> String{
    let emojies = [UInt32](0x1F601...0x1F64F)
    + [UInt32](0x2702...0x27B0)
    + [UInt32](0x1F680...0x1F6C0)
    + [UInt32](0x1F170...0x1F251)

    let rand = Int(arc4random_uniform(UInt32(emojies.count - 1)))

    return String(UnicodeScalar(emojies[rand]))
}

随机选择一个插座并设置其他插座

Randomly choosing one outlet and setting others

ios

swift

random

uibutton

variable-assignment