Ios 没有从字符串中删除空白

我正在删除带有“trimmingCharacters”的字符串中的空格，但没有删除空格

    let number = "123 456"
    let replaced = number.trimmingCharacters(in: .whitespaces)
     print(username)
     print(replaced)

---

在

字符串上使用
重放发生（of:with:）方法，即

let number = "123 456"
let replaced = number.replacingOccurrences(of: " ", with: "")

print(replaced) //Output: 123456

使用字符串重播发生次数

let number = "123 456"
let replaced = number.replacingOccurrences(of: " ", with: "")
print(replaced)

或

let removed = number.filter{!$0.isWhitespace}
print(removed)

使用过滤器

let removed = number.filter{!$0.isWhitespace}
print(removed)

产出123456