首先,你的「本土方式」不等於「Swifty方式」。
SwiftyJSON版本有45 subscript
訪問,但本地方式只有23 subscript
訪問。
使 「土辦法」 等同,它應該是這樣的:
let openDescription = attraction["OpeningHours"]!["OpeningHoursGenericExceptions"] as String
let monOpen = (attraction["OpeningHours"]!["Monday"]!!["From"] as String).componentsSeparatedByString(":")
let monClose = (attraction["OpeningHours"]!["Monday"]!!["To"] as String).componentsSeparatedByString(":")
let tueOpen = (attraction["OpeningHours"]!["Tuesday"]!!["From"] as String).componentsSeparatedByString(":")
let tueClose = (attraction["OpeningHours"]!["Tuesday"]!!["To"]! as String).componentsSeparatedByString(":")
// ...
或 「SWIFTY方式」 應該是這樣的:
let openHours = json[0]["OpeningHours"]
var day:JSON
day = openHours["Monday"]
if let open = day["From"].string {
monOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"].string {
monClose = close.componentsSeparatedByString(":")
}
day = openHours["Tuesday"]
if let open = day["From"].string {
tueOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"].string {
tueClose = close.componentsSeparatedByString(":")
}
// ...
反正是,SwiftyJSON是慢。讓我們來衡量:
import Foundation
import XCTest
let orgJson:AnyObject = [
[
"OpeningHours": [
"OpeningHoursGenericExceptions": "test",
"Monday": ["From":"1:2:3","To":"1:2:3"],
"Tuesday": ["From":"1:2:3","To":"1:2:3"],
"Wednesday": ["From":"1:2:3","To":"1:2:3"],
"Thursday": ["From":"1:2:3","To":"1:2:3"],
"Friday": ["From":"1:2:3","To":"1:2:3"],
"Saturday": ["From":"1:2:3","To":"1:2:3"],
"Sunday": ["From":"1:2:3","To":"1:2:3"],
]
]
]
let json = JSON(orgJson)
class JSONTestTests: XCTestCase {
func testNativeSubscript() {
measureBlock {() -> Void in
for _ in 0 ..< 400 {
autoreleasepool {
if let attraction = orgJson[0] as? NSDictionary {
let openDescription = attraction["OpeningHours"]!["OpeningHoursGenericExceptions"] as String
let monOpen = (attraction["OpeningHours"]!["Monday"]!!["From"] as String).componentsSeparatedByString(":")
let monClose = (attraction["OpeningHours"]!["Monday"]!!["To"] as String).componentsSeparatedByString(":")
let tueOpen = (attraction["OpeningHours"]!["Tuesday"]!!["From"] as String).componentsSeparatedByString(":")
let tueClose = (attraction["OpeningHours"]!["Tuesday"]!!["To"] as String).componentsSeparatedByString(":")
let wedOpen = (attraction["OpeningHours"]!["Wednesday"]!!["From"] as String).componentsSeparatedByString(":")
let wedClose = (attraction["OpeningHours"]!["Wednesday"]!!["To"] as String).componentsSeparatedByString(":")
let thuOpen = (attraction["OpeningHours"]!["Thursday"]!!["From"] as String).componentsSeparatedByString(":")
let thuClose = (attraction["OpeningHours"]!["Thursday"]!!["To"] as String).componentsSeparatedByString(":")
let friOpen = (attraction["OpeningHours"]!["Friday"]!!["From"] as String).componentsSeparatedByString(":")
let friClose = (attraction["OpeningHours"]!["Friday"]!!["To"] as String).componentsSeparatedByString(":")
let satOpen = (attraction["OpeningHours"]!["Saturday"]!!["From"] as String).componentsSeparatedByString(":")
let satClose = (attraction["OpeningHours"]!["Saturday"]!!["To"] as String).componentsSeparatedByString(":")
let sunOpen = (attraction["OpeningHours"]!["Sunday"]!!["From"] as String).componentsSeparatedByString(":")
let sunClose = (attraction["OpeningHours"]!["Sunday"]!!["To"] as String).componentsSeparatedByString(":")
XCTAssertEqual(monOpen, ["1","2","3"], "")
XCTAssertEqual(openDescription, "test")
}
}
}
}
}
func testJSONSubscript() {
measureBlock {() -> Void in
for _ in 0 ..< 400 {
autoreleasepool {
let attraction = json[0]
let openDescription:String = attraction["OpeningHours"]["OpeningHoursGenericExceptions"].string!
let monOpen:[String] = attraction["OpeningHours"]["Monday"]["From"].string!.componentsSeparatedByString(":")
let monClose:[String] = attraction["OpeningHours"]["Monday"]["To"].string!.componentsSeparatedByString(":")
let tueOpen:[String] = attraction["OpeningHours"]["Tuesday"]["From"].string!.componentsSeparatedByString(":")
let tueClose:[String] = attraction["OpeningHours"]["Tuesday"]["To"].string!.componentsSeparatedByString(":")
let wedOpen:[String] = attraction["OpeningHours"]["Wednesday"]["From"].string!.componentsSeparatedByString(":")
let wedClose:[String] = attraction["OpeningHours"]["Wednesday"]["To"].string!.componentsSeparatedByString(":")
let thuOpen:[String] = attraction["OpeningHours"]["Thursday"]["From"].string!.componentsSeparatedByString(":")
let thuClose:[String] = attraction["OpeningHours"]["Thursday"]["To"].string!.componentsSeparatedByString(":")
let friOpen:[String] = attraction["OpeningHours"]["Friday"]["From"].string!.componentsSeparatedByString(":")
let friClose:[String] = attraction["OpeningHours"]["Friday"]["To"].string!.componentsSeparatedByString(":")
let satOpen:[String] = attraction["OpeningHours"]["Saturday"]["From"].string!.componentsSeparatedByString(":")
let satClose:[String] = attraction["OpeningHours"]["Saturday"]["To"].string!.componentsSeparatedByString(":")
let sunOpen:[String] = attraction["OpeningHours"]["Sunday"]["From"].string!.componentsSeparatedByString(":")
let sunClose:[String] = attraction["OpeningHours"]["Sunday"]["To"].string!.componentsSeparatedByString(":")
XCTAssertEqual(monOpen, ["1","2","3"], "")
}
}
}
}
func testNativeBinding() {
measureBlock {() -> Void in
for _ in 0 ..< 400 {
autoreleasepool {
var monOpen:[String] = []
var monClose:[String] = []
var tueOpen:[String] = []
var tueClose:[String] = []
var wedOpen:[String] = []
var wedClose:[String] = []
var thuOpen:[String] = []
var thuClose:[String] = []
var friOpen:[String] = []
var friClose:[String] = []
var satOpen:[String] = []
var satClose:[String] = []
var sunOpen:[String] = []
var sunClose:[String] = []
var openDescription:String = ""
if let attractionsArray = orgJson as? NSArray{
if let attraction = attractionsArray[0] as? NSDictionary{
if let openHours = attraction["OpeningHours"] as? NSDictionary{
if let day = openHours["Monday"] as? NSDictionary{
if let open = day["From"] as? String{
monOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"] as? String{
monClose = close.componentsSeparatedByString(":")
}
}
if let day = openHours["Tuesday"] as? NSDictionary{
if let open = day["From"] as? String{
tueOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"] as? String{
tueClose = close.componentsSeparatedByString(":")
}
}
if let day = openHours["Wednesday"] as? NSDictionary{
if let open = day["From"] as? String{
wedOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"] as? String{
wedClose = close.componentsSeparatedByString(":")
}
}
if let day = openHours["Thursday"] as? NSDictionary{
if let open = day["From"] as? String{
thuOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"] as? String{
thuClose = close.componentsSeparatedByString(":")
}
}
if let day = openHours["Friday"] as? NSDictionary{
if let open = day["From"] as? String{
friOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"] as? String{
friClose = close.componentsSeparatedByString(":")
}
}
if let day = openHours["Saturday"] as? NSDictionary{
if let open = day["From"] as? String{
satOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"] as? String{
satClose = close.componentsSeparatedByString(":")
}
}
if let day = openHours["Sunday"] as? NSDictionary{
if let open = day["From"] as? String{
sunOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"] as? String{
sunClose = close.componentsSeparatedByString(":")
}
}
if let desc = openHours["OpeningHoursGenericExceptions"] as? String{
openDescription = desc
}
}
}
}
XCTAssertEqual(monOpen, ["1","2","3"], "")
}
}
}
}
func testJSONBinding() {
measureBlock {() -> Void in
for _ in 0 ..< 400 {
autoreleasepool {
var monOpen:[String] = []
var monClose:[String] = []
var tueOpen:[String] = []
var tueClose:[String] = []
var wedOpen:[String] = []
var wedClose:[String] = []
var thuOpen:[String] = []
var thuClose:[String] = []
var friOpen:[String] = []
var friClose:[String] = []
var satOpen:[String] = []
var satClose:[String] = []
var sunOpen:[String] = []
var sunClose:[String] = []
var openDescription:String = ""
let openHours = json[0]["OpeningHours"]
var day:JSON
day = openHours["Monday"]
if let open = day["From"].string {
monOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"].string {
monClose
= close.componentsSeparatedByString(":")
}
day = openHours["Tuesday"]
if let open = day["From"].string {
tueOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"].string {
tueClose = close.componentsSeparatedByString(":")
}
day = openHours["WednesDay"]
if let open = day["From"].string {
wedOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"].string {
wedClose = close.componentsSeparatedByString(":")
}
day = openHours["Thursday"]
if let open = day["From"].string {
thuOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"].string {
thuClose = close.componentsSeparatedByString(":")
}
day = openHours["Friday"]
if let open = day["From"].string {
friOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"].string {
friClose = close.componentsSeparatedByString(":")
}
day = openHours["Saturday"]
if let open = day["From"].string {
satOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"].string {
satClose = close.componentsSeparatedByString(":")
}
day = openHours["Sunday"]
if let open = day["From"].string {
sunOpen = open.componentsSeparatedByString(":")
}
if let close = day["To"].string {
sunClose = close.componentsSeparatedByString(":")
}
XCTAssertEqual(monOpen, ["1","2","3"], "")
}
}
}
}
}
輸出:
<unknown>:0: Test Case '-[JSONTestTests.JSONTestTests testJSONBinding]' measured [Time, seconds] average: 0.804, relative standard deviation: 5.592%, values: [0.835687, 0.814827, 0.819685, 0.841900, 0.764961, 0.845202, 0.691442, 0.779255, 0.818213, 0.830698], performanceMetricID:com.apple.XCTPerformanceMetric_WallClockTime, baselineName: "", baselineAverage: , maxPercentRegression: 10.000%, maxPercentRelativeStandardDeviation: 10.000%, maxRegression: 0.100, maxStandardDeviation: 0.100
<unknown>:0: Test Case '-[JSONTestTests.JSONTestTests testJSONSubscript]' measured [Time, seconds] average: 4.247, relative standard deviation: 3.496%, values: [4.019640, 4.004123, 4.146146, 4.194535, 4.487171, 4.300971, 4.310613, 4.408405, 4.318354, 4.279362], performanceMetricID:com.apple.XCTPerformanceMetric_WallClockTime, baselineName: "", baselineAverage: , maxPercentRegression: 10.000%, maxPercentRelativeStandardDeviation: 10.000%, maxRegression: 0.100, maxStandardDeviation: 0.100
<unknown>:0: Test Case '-[JSONTestTests.JSONTestTests testNativeBinding]' measured [Time, seconds] average: 0.223, relative standard deviation: 2.773%, values: [0.221099, 0.227395, 0.218860, 0.225989, 0.227128, 0.222370, 0.229956, 0.214535, 0.210818, 0.229868], performanceMetricID:com.apple.XCTPerformanceMetric_WallClockTime, baselineName: "", baselineAverage: , maxPercentRegression: 10.000%, maxPercentRelativeStandardDeviation: 10.000%, maxRegression: 0.100, maxStandardDeviation: 0.100
<unknown>:0: Test Case '-[JSONTestTests.JSONTestTests testNativeSubscript]' measured [Time, seconds] average: 0.362, relative standard deviation: 17.528%, values: [0.346285, 0.316185, 0.333650, 0.339416, 0.330243, 0.354034, 0.378730, 0.269519, 0.486904, 0.467607], performanceMetricID:com.apple.XCTPerformanceMetric_WallClockTime, baselineName: "", baselineAverage: , maxPercentRegression: 10.000%, maxPercentRelativeStandardDeviation: 10.000%, maxRegression: 0.100, maxStandardDeviation: 0.100
- 你SwiftyJSON:4.247
- 你的母語:0.223
- 我SwiftyJSON:0.804
- 我的家鄉:0.362
順便說一句,如果我是你,我會做這樣的事情:
if let hours = orgJson[0]?["OpeningHours"] as? NSDictionary {
let openDescription = hours["OpeningHoursGenericExceptions"] as? String ?? ""
let monOpen = hours["Monday"]?["From"]??.componentsSeparatedByString?(":") as? [String] ?? []
let monClose = hours["Monday"]?["To"]??.componentsSeparatedByString?(":") as? [String] ?? []
let tueOpen = hours["Tuesday"]?["From"]??.componentsSeparatedByString?(":") as? [String] ?? []
let tueClose = hours["Tuesday"]?["To"]??.componentsSeparatedByString?(":") as? [String] ?? []
let wedOpen = hours["Wednesday"]?["From"]??.componentsSeparatedByString?(":") as? [String] ?? []
let wedClose = hours["Wednesday"]?["To"]??.componentsSeparatedByString?(":") as? [String] ?? []
let thuOpen = hours["Thursday"]?["From"]??.componentsSeparatedByString?(":") as? [String] ?? []
let thuClose = hours["Thursday"]?["To"]??.componentsSeparatedByString?(":") as? [String] ?? []
let friOpen = hours["Friday"]?["From"]??.componentsSeparatedByString?(":") as? [String] ?? []
let friClose = hours["Friday"]?["To"]??.componentsSeparatedByString?(":") as? [String] ?? []
let satOpen = hours["Saturday"]?["From"]??.componentsSeparatedByString?(":") as? [String] ?? []
let satClose = hours["Saturday"]?["To"]??.componentsSeparatedByString?(":") as? [String] ?? []
let sunOpen = hours["Sunday"]?["From"]??.componentsSeparatedByString?(":") as? [String] ?? []
let sunClose = hours["Sunday"]?["To"]??.componentsSeparatedByString?(":") as? [String] ?? []
// ...
}
這是相當快的,安全的,沒有那麼複雜。
爲什麼SwiftyJSON速度很慢?
在subscript
訪問,SwiftyJSON確實:
- 檢查關鍵是
String
- 標再次用
self[key:sub]
- 檢查底層對象是
NSDictionary
- 下標與所提供的密鑰
底層
NSDictionary
- 構造
JSON
對象與結果
return
也許編譯器優化了一些措施,但「比本地慢」是有點不可避免:)
感謝您一個非常完整的答案!並與基準!因爲我在Swift上很新穎(我猜很多人都是:)很多編碼是first-try-trial-and-error,我按照SwiftyJSON自述文件中的建議進行了JSON解析。看看解析方法的不同例子,我並不後悔從我的項目中取出swifty,「本地」解析的複雜性並不是真正的問題,並且增加了性能差異,我沒有看到swifty作爲選項。 – Simpa 2015-03-29 08:15:06
我的意思是Swifty的創建者沒有冒犯,我認爲它可以對很多開發者有很大的用處。但是使用google快速解析json幾乎只給出了使用swifty的結果給我的印象是要走的路。但也許這不適合每個人? :) – Simpa 2015-03-29 08:23:33
@Simpa在Swift世界中,谷歌中的很多點擊是不可信的。人們會得到Objective-C已經死亡的印象,Cocoapods被接受爲標準,等等......事實上,我認爲很多這些外觀都是有問題的。但是,SwiftyJSON使用起來太慢了?這是另一個問題,但如果你最初得到了這些結果,你可能沒有注意到。 – 2016-02-17 23:54:24