|
("arr1数组是空")
}else {
print("arr1数组不空")
}
// arr1[arr1.count-2] 取数组的某个元素
print(arr1[arr1.count-2])// hySwift
// print(arr1[0])// hyArr
// public var first: Self.Iterator.Element? { get }
print(arr1.first!)// hyArr
// 遍历数组
for i in 0..<arr1.count {
print(arr1[i])
}
// 包含
if arr0 .contains("test") {
print("数组包含 test")
}else {
print("数组不包含 test")
}
// 删除元素
// arr2 .remove(at: 4)
// arr2 .removeSubrange(1..<3)// 删除 1、2 两个元素
// arr2 .removeLast()
// arr2 .removeFirst()
arr2 .removeAll()
print(arr2)
// 添加元素
arr2 .append("new1")// ["new1"]
arr2.append(contentsOf: ["Shakia", "William"])
print(arr2)
arr2 = arr1 + arr2// ["hyArr", 1, "hySwift", 3, "new1"]
arr2 = arr1
arr2 .insert("insertElement", at: 3)//["hyArr", 1, "hySwift", "insertElement", 3, "new1"]
// 更换
if let i = arr0.index(of: "test") {
arr0[i] = "测试"
}
arr2[0] = "domy"
print(arr2)
// 数组排序
var sortArr = [3,5,1,0,8,0]
sortArr.sort(by: >)
print(String(format:"排序后："),sortArr)// 排序后： [8, 5, 3, 1, 0, 0]
// 二维数组
let tArr1 = [["tSwift","haha"],1,[3,2]] as [Any]
let subArr1 = tArr1[0]
print(subArr1)
/// Array => NSArray
/// 苹果的例子
/// Description:
/// The following example shows how you can bridge an `Array` instance to
/// `NSArray` to use the `write(to:atomically:)` method. In this example, the
/// `colors` array can be bridged to `NSArray` because its `String` elements
/// bridge to `NSString`. The compiler prevents bridging the `moreColors`
/// array, on the other hand, because its `Element` type is
/// `Optional<String>`, which does *not* bridge to a Foundation type.
let colors = ["periwinkle", "rose", "moss"]
let moreColors: [String?] = ["ochre", "pine"]
let url = NSURL(fileURLWithPath: "names.plist")
(colors as NSArray).write(to: url as URL, atomically: true)
// true
(moreColors as NSArray).write(to: url as URL, atomically: true)
// error: cannot convert value of type '[String?]' to type 'NSArray'
/// Array 的更多其他用法点进去查看方法文档
}
3、字典的简单使用
// 字典 dictionary
func dictionaryTest() -> Void {
// 创建字典
var dict = [200:"ok",400:"error"]// [key:value]
var emptyDict: [String: Any] = [:]// 空字典 var emptyDict: [Int: String] = [:]
emptyDict = ["key1":"value1","key2":2]
// Getting and Setting Dictionary Values
print(dict[200]!)// ok
print(emptyDict["key1"]!)// value1
// 添加键值对
emptyDict["key3"] = "value3"
print(emptyDict)// ["key2": 2, "key3": "value3", "key1": "value1"]
// 更新键值对的value
emptyDict["key2"] = "updateva lue2"
print(String(format:("更换value后：")),emptyDict)
var interestingNumbers = ["primes": [2, 3, 5, 7, 11, 13, 15],
"triangular": [1, 3, 6, 10, 15, 21, 28],
"hexagonal": [1, 6, 15, 28, 45, 66, 91]]
// 排序
for key in interestingNumbers.keys {
interestingNumbers[key]?.sort(by: >)
}
print(interestingNumbers["primes"]!)
/// print(interestingNumbers)
/// ["hexago |