feat: add swift implementation to lcof problem: No.58.1 (doocs#2948)

Author: klever34

lcof/面试题58 - I. 翻转单词顺序/README.md

@@ -251,6 +251,36 @@ public class Solution {
 }
 ```
 
+#### Swift
+
+```swift
+class Solution {
+    func reverseWords(_ s: String) -> String {
+        var words = [String]()
+        var i = s.startIndex
+        
+        while i < s.endIndex {
+            while i < s.endIndex && s[i] == " " {
+                i = s.index(after: i)
+            }
+            if i < s.endIndex {
+                var t = ""
+                var j = i
+                while j < s.endIndex && s[j] != " " {
+                    t.append(s[j])
+                    j = s.index(after: j)
+                }
+                words.append(t)
+                i = j
+            }
+        }
+        
+        words.reverse()
+        return words.joined(separator: " ")
+    }
+}
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->

lcof/面试题58 - I. 翻转单词顺序/Solution.swift

@@ -0,0 +1,25 @@
+class Solution {
+    func reverseWords(_ s: String) -> String {
+        var words = [String]()
+        var i = s.startIndex
+        
+        while i < s.endIndex {
+            while i < s.endIndex && s[i] == " " {
+                i = s.index(after: i)
+            }
+            if i < s.endIndex {
+                var t = ""
+                var j = i
+                while j < s.endIndex && s[j] != " " {
+                    t.append(s[j])
+                    j = s.index(after: j)
+                }
+                words.append(t)
+                i = j
+            }
+        }
+        
+        words.reverse()
+        return words.joined(separator: " ")
+    }
+}