iOS Array和Dictionary常用方法

Dictionary的常用方法

代码

代码语言：javascript复制

//创建
var dic:[String:String] = [:];

//赋值
dic["22"] = "222";
dic["bb"] = "bbb";
dic["33"] = "333";
dic["11"] = "111";
dic["aa"] = "aaa";
print("n赋值dic:n(dic)");

print("n遍历获取下标key:");
for (index, element) in dic.enumerate() {
    print("Item (index): (element)")
}

//key的数组
let keySet = Array(dic.keys);
print("nkey的数组keySet:n(keySet)");

//key数组升序排列
let keyNew = keySet.sort { (a, b) -> Bool in
    return a < b;
}
print("nkey数组升序排列keyNew:n(keyNew)");

//dic按key的升序排列
var dicNew = dic.sort { (a, b) -> Bool in
    return a.0 < b.0;
}
print("ndic按key的升序排列dicNew:n(dicNew)");

//移除
dicNew.removeFirst()
print("n移除dicNew:n(dicNew)");

控制台输出

代码语言：javascript复制

赋值dic:
["22": "222", "11": "111", "aa": "aaa", "bb": "bbb", "33": "333"]

遍历获取下标key:
Item 0: ("22", "222")
Item 1: ("11", "111")
Item 2: ("aa", "aaa")
Item 3: ("bb", "bbb")
Item 4: ("33", "333")

key的数组keySet:
["22", "11", "aa", "bb", "33"]

key数组升序排列keyNew:
["11", "22", "33", "aa", "bb"]

dic按key的升序排列dicNew:
[("11", "111"), ("22", "222"), ("33", "333"), ("aa", "aaa"), ("bb", "bbb")]

移除dicNew:
[("22", "222"), ("33", "333"), ("aa", "aaa"), ("bb", "bbb")]

Array的常用方法

代码

代码语言：javascript复制

//创建
var arr:[String] = [];

//赋值
arr.append("111");
arr.append("bbb");
arr.append("aaa");
print("n赋值arr:n(arr)");

//排序
let reverseArr = arr.reverse();
print("n排序reverseArr:n(reverseArr)");

//逆向后遍历
print("n逆向后遍历key:");
for key in reverseArr{
    print("(key)");
}

print("n逆向后遍历获取下标key:");
for (index, element) in reverseArr.enumerate() {
    print("Item (index): (element)")
}

//移除
arr.removeFirst()
print("n移除arr:n(arr)");

//范围移除
arr.removeRange(Range(start:0,end:1))
print("n范围移除arr:n(arr)");

控制台输出

代码语言：javascript复制

赋值arr:
["111", "bbb", "aaa"]

排序reverseArr:
ReverseRandomAccessCollection<Array<String>>(_base: ["111", "bbb", "aaa"])

逆向后遍历key:
aaa
bbb
111

逆向后遍历获取下标key:
Item 0: aaa
Item 1: bbb
Item 2: 111

移除arr:
["bbb", "aaa"]

范围移除arr:
["aaa"]

dictionary

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