Swift- 字符串删除

题目:输入两个字符串，从第一个字符串中删除在第二个中出现过的所偶字符串。例如从第一个字符串"We are students."中删除第二个字符中“aeiou”中出现过的字符得到的结果是"W r stdnts".
核心代码:
<pre><code>`
func compareDelete(origin:String,delte:String) -> String {
if origin.characters.count == 0 {
return ""
}

    var dict:[String:Int] = [:]
    for i in 0..<delte.characters.count {
        let char:String = delte[i]
        if dict[char] == nil {
            dict[char] = 1
        }
    }
    var result:String = ""
    for i in 0..<origin.characters.count  {
        let char:String = origin[i]
        if dict[char] == nil {
            result += char
        }
    }
    
    return result
}`</code></pre>

测试代码:
<pre><code>var result:String = hashSearch.compareDelete(origin: "We are students.", delte: "aeiou") print("FlyElephatn-对比删除之后的字符串---\(result)")</code></pre>