92 lines
2.7 KiB
Swift
Executable File
92 lines
2.7 KiB
Swift
Executable File
//
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// Array+Extension.swift
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// PaiLiBo
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//
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// Created by SeanXu on 2019/10/25.
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// Copyright © 2019 GuoXiaoMei. All rights reserved.
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//
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import Foundation
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extension Sequence {
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func group<GroupingType: Hashable>(by key: (Iterator.Element) throws -> GroupingType) rethrows -> [[Iterator.Element]] {
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try reduce(into: []) { result, element in
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if let lastElement = result.last?.last, try key(lastElement) == key(element) {
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result[result.index(before: result.endIndex)].append(element)
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} else {
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result.append([element])
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}
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}
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}
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}
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extension Array where Element: Equatable {
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public mutating func removeObject(_ object : Iterator.Element) {
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if let index = firstIndex(of: object) {
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remove(at: index)
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}
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}
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public mutating func insertObject(_ object : Iterator.Element) {
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if let _ = firstIndex(of: object) {
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return
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} else {
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append(object)
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}
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}
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public func toJsonArray() -> String{
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guard self.count > 0 else {
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return ""
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}
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let mutaleSting:NSMutableString = "["
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for (index,obj) in self.enumerated(){
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if obj is String{
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mutaleSting.append("\"")
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mutaleSting.append(obj as! String)
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mutaleSting.append("\"")
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if index < self.count - 1{
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mutaleSting.append(",")
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}
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if index == self.count-1 {
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mutaleSting.append("]")
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}
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}
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}
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return mutaleSting as String
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}
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public func dicArrayToJsonString() -> String {
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if (!JSONSerialization.isValidJSONObject(self)) {
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print("无法解析出JSONString")
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return " "
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}
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if let data = try? JSONSerialization.data(withJSONObject: self, options: []), let JSONString = NSString(data:data as Data,encoding: String.Encoding.utf8.rawValue) as String? {
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return JSONString
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}
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return " "
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}
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}
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extension Array {
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public static var safeValue: Array<Element> { return [] }
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public func safeElement(_ index: Int) -> Element? {
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return index >= 0 && index < endIndex ? self[index] : nil
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}
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public subscript(safe index: Int) -> Element? {
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return safeElement(index)
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}
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}
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extension Array {
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mutating func moveToFirst(where condition: (Element) -> Bool) {
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guard let index = firstIndex(where: condition) else { return }
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// 移除该元素，再插入到头部
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let item = remove(at: index)
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insert(item, at: 0)
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}
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}
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