用Swift取出两个数组的相同元素，用数组的forEach方法就可以，示例如下：
let arrayOne = ["a","ab","abc","ac"]
let arrayTwo = ["ab","abc","c"]
arrayOne.forEach { (i) in
arrayTwo.forEach({ (j) in
if i == j{
//做你需要做的事
print("\(i)")
}
})
}
结果如下：
ab
abc
