Swift 循环、数组 字典的遍历

 1 import Foundation
 2 
 3 // 数组声明
 4 var arr = [String]()
 5 // 数组循环添加项
 6 for var index in 0...100{
 7     arr.append("Item \(index)")
 8 }
 9 
10 // 遍历方法1
11 for item in arr {
12     print (item)
13 }
14 // 遍历方法2
15 for (index, value) in arr.enumerate() {
16     print("Item \(index + 1 ) :\(value)")
17 }
18 
19 print("Hello, World!")

 

1 var i = 100
2 while i < arr.count{
3     print(arr[i])
4     i++
5 }
6 
7 
8 print(arr[25])

1 // 字典的遍历
2 var dict = ["name":"jinpangpang","age":"16"]
3 for (key,value) in dict{
4     print("\(key),\(value)")
5 }