swift 的快速便利swift enumerated()

1. for in 与 oc 中的用法还是一样

var titesArr:[String] = ["I","AM","IS","WITH","L", "O", "V", "E", "I", "O", "S"]
for tempObj in titesArr {
   print("测试:\(tempObj)")
    print("<==========>")
}

输入如下：

Snip20200306_1.png

2. enumerated() 正向快速遍历，还能拿到索引和指定的值。

var titesArr:[String] = ["I","AM","IS","WITH","L", "O", "V", "E", "I", "O", "S"]
for (index, text) in titesArr.enumerated() {
    print("<------------------>")
   print("index:\(index) <=> text:\(text)")
}

Snip20200306_2.png

3. reversed() 反向遍历获取对应的索引和值。

var titesArr:[String] = ["I","AM","IS","WITH","L", "O", "V", "E", "I", "O", "S"]
for (index, text) in titesArr.enumerated().reversed() {
    print("<------------------>")
   print("index:\(index) <=> text:\(text)")
}

Snip20200306_3.png