已有代码：
func getRandomHeaderColor(){ let headerColorHexStrArr = [ “#55c1d8”, “#89c997”, “#f6b37f”, “f19ec2”, “#84ccc9”, “#f29c9f”, “#c490bf”, “#32b16c”, “#ea68a2”, ]letrandomColorHexStr = headerColorHexStrArr[] } |
希望获得随机数，以便于取得对应的hex值
此处是：
希望传递进入随机数范围，然后获得一个随机的整形数值，即可。
［解决过程］
1.搜：
swift random int number
参考：
最后用代码，和测试：
func getRandomInRange(lower:Int, upper:Int) -> Int {
return lower + Int(arc4random_uniform(UInt32(upper - lower + 1)))
}
let headerColorHexStrArr:[String] = [
"#55c1d8",
"#89c997",
"#f6b37f",
"f19ec2",
"#84ccc9",
"#f29c9f",
"#c490bf",
"#32b16c",
"#ea68a2",
]
let lower = 0
let upper = headerColorHexStrArr.count - 1 // 8
var randomIndex:Int = getRandomInRange(lower, upper: upper)
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")
randomIndex = getRandomInRange(lower, upper: upper)
print("randomIndex=\(randomIndex)")输入结果是：
randomIndex=5 randomIndex=4 randomIndex=1 randomIndex=8 randomIndex=3 randomIndex=7 randomIndex=0 randomIndex=0 randomIndex=4 randomIndex=7 randomIndex=7 randomIndex=2 randomIndex=6 randomIndex=0 |
［总结］
swift生成随机数，可以用：
func getRandomInRange(lower:Int, upper:Int) -> Int {
return lower + Int(arc4random_uniform(UInt32(upper - lower + 1)))
}转载请注明：在路上 » ［已解决］swift获取随机数值