iOS 应用内购买订阅可从 SKProduct 获得免费试用期长度

我正在通过订阅进行应用内购买。在 swift 中，你可以从 SKProduct 获取价格和价格区域设置，如下所示：

weeklyProduct.price.doubleValue  
weeklyProduct.priceLocale.currencySymbol

其中每周产品是SKP产品。

是否可以获得免费试用期？例如，我指定了该产品的两周免费试用期。我可以从SKP产品中获得这个吗？

我已经使用DateComponentsFormatter解决了它，这为您节省了大量时间，可以在不同的语言中进行本地化并处理复数形式等等。这可能看起来像很多代码，但我希望它能在未来节省我的时间。

import Foundation
class PeriodFormatter {
static var componentFormatter: DateComponentsFormatter {
let formatter = DateComponentsFormatter()
formatter.maximumUnitCount = 1
formatter.unitsStyle = .full
formatter.zeroFormattingBehavior = .dropAll
return formatter
}
static func format(unit: NSCalendar.Unit, numberOfUnits: Int) -> String? {
var dateComponents = DateComponents()
dateComponents.calendar = Calendar.current
componentFormatter.allowedUnits = [unit]
switch unit {
case .day:
dateComponents.setValue(numberOfUnits, for: .day)
case .weekOfMonth:
dateComponents.setValue(numberOfUnits, for: .weekOfMonth)
case .month:
dateComponents.setValue(numberOfUnits, for: .month)
case .year:
dateComponents.setValue(numberOfUnits, for: .year)
default:
return nil
}
return componentFormatter.string(from: dateComponents)
}
}

它需要将 SKP产品周期单位转换为 NSCalendarUnit

import StoreKit
@available(iOS 11.2, *)
extension SKProduct.PeriodUnit {
func toCalendarUnit() -> NSCalendar.Unit {
switch self {
case .day:
return .day
case .month:
return .month
case .week:
return .weekOfMonth
case .year:
return .year
@unknown default:
debugPrint("Unknown period unit")
}
return .day
}
}

您可以从订阅期调用它，如下所示：

import StoreKit
@available(iOS 11.2, *)
extension SKProductSubscriptionPeriod {
func localizedPeriod() -> String? {
return PeriodFormatter.format(unit: unit.toCalendarUnit(), numberOfUnits: numberOfUnits)
}
}

您可以像这样从SKProductDiscount调用。请注意，我目前没有实现其他支付模式。

import StoreKit
@available(iOS 11.2, *)
extension SKProductDiscount {
func localizedDiscount() -> String? {
switch paymentMode {
case PaymentMode.freeTrial:
return "Free trial for (subscriptionPeriod.localizedPeriod() ?? "a period")"
default:
return nil
}
}
}

您可以获得它，但如上所述，它只能从iOS 11.2开始工作，对于其他版本，您必须通过API从服务器获取它。

这是我使用的示例代码：

if #available(iOS 11.2, *) {
if let period = prod.introductoryPrice?.subscriptionPeriod {
print("Start your (period.numberOfUnits) (unitName(unitRawValue: period.unit.rawValue)) free trial")
}
} else {
// Fallback on earlier versions
// Get it from your server via API
}
func unitName(unitRawValue:UInt) -> String {
switch unitRawValue {
case 0: return "days"
case 1: return "weeks"
case 2: return "months"
case 3: return "years"
default: return ""
}
}

以Eslam的回答为灵感，我创建了一个SKProduct.PeriodUnit的扩展

extension SKProduct.PeriodUnit {
func description(capitalizeFirstLetter: Bool = false, numberOfUnits: Int? = nil) -> String {
let period:String = {
switch self {
case .day: return "day"
case .week: return "week"
case .month: return "month"
case .year: return "year"
}
}()
var numUnits = ""
var plural = ""
if let numberOfUnits = numberOfUnits {
numUnits = "(numberOfUnits) " // Add space for formatting
plural = numberOfUnits > 1 ? "s" : ""
}
return "(numUnits)(capitalizeFirstLetter ? period.capitalized : period)(plural)"
}
}

要使用：

if #available(iOS 11.2, *),
let period = prod?.introductoryPrice?.subscriptionPeriod
{
let desc = period.unit.description(capitalizeFirstLetter: true, numberOfUnits: period.numberOfUnits)
} else {
// Fallback
}

这将创建一个格式良好的字符串(例如 1 天、1 周、2 个月、2 年(

不错的一个@scott伍德。我会让它成为SKProduct.PeriodUnit的属性而不是函数。这将使行为与枚举更加一致：

@available(iOS 11.2, *)
extension SKProduct.PeriodUnit {
var description: String {
switch self {
case .day: return "day"
case .week: return "week"
case .month: return "month"
case .year: return "year"
// support for future values
default:
return "N/A"
}
}
func pluralisedDescription(length: Int) -> String {
let lengthAndDescription = length.description + " " + self.description
let plural = length > 1 ?  lengthAndDescription + "s" : lengthAndDescription
return plural
}
}

然后是一个基于description属性返回复数的函数。

是的，正如其他人指出的那样，如果您的应用程序支持其他语言，您应该本地化复数形式。

试用时长不包含在 SKProduct 信息中，必须硬编码到应用程序中或存储在您的服务器上。获取此类信息(目前(的唯一可用选项是从收据本身。

从 iOS 11.2 开始，您可以使用SKProduct的属性获取有关试用introductoryPrice的信息。

它包含SKProductDiscount类的实例，它描述了所有折扣期，包括免费试用。

Swift 5

以Eslam和Scott的答案为灵感：

import StoreKit
extension SKProduct {
func priceString() -> String {
let period:String = {
switch self.subscriptionPeriod?.unit {
case .day: return "day"
case .week: return "week"
case .month: return "month"
case .year: return "year"
case .none: return ""
case .some(_): return ""
}
}()
let price = self.localizedPrice!
let numUnits = self.subscriptionPeriod?.numberOfUnits ?? 0
let plural = numUnits > 1 ? "s" : ""
return String(format: "%@ for %d %@%@", arguments: [price, numUnits, period, plural])
}
}

要使用：

let price = product.priceString()
print(price)

结果：

THB 89.00 for 7 days
THB 149.00 for 1 month

+ (NSString*)localizedTitleForSKPeriod:(SKProductSubscriptionPeriod*)period{
NSDateComponents *comps = [NSDateComponents new];
NSDateComponentsFormatter *fmt = [NSDateComponentsFormatter new];
switch (period.unit) {
case SKProductPeriodUnitDay:{
fmt.allowedUnits = NSCalendarUnitDay;
comps.day = period.numberOfUnits;
}break;
case SKProductPeriodUnitWeek:{
fmt.allowedUnits = NSCalendarUnitWeekOfMonth;
comps.weekOfMonth = period.numberOfUnits;
}break;
case SKProductPeriodUnitMonth:{
fmt.allowedUnits = NSCalendarUnitMonth;
comps.month = period.numberOfUnits;
}break;
case SKProductPeriodUnitYear: {
fmt.allowedUnits = NSCalendarUnitYear;
comps.year = period.numberOfUnits;
}break;
}
// 1 Day, 1 Week, 2 Weeks, 1 Month, 2 Months, 3 Months, 6 Months, 1 Year
fmt.unitsStyle = NSDateComponentsFormatterUnitsStyleFull;
// One Day, One Week, Two Weeks, etc
//fmt.unitsStyle = NSDateComponentsFormatterUnitsStyleSpellOut;
NSString *s = [[fmt stringFromDateComponents:comps] capitalizedString];
return s;
}

目标 C

#import "SKProduct+SKProduct.h"
-(NSString*_Nullable)localizedTrialDuraion{
if (@available(iOS 11.2, *)) {

NSDateComponentsFormatter *formatter = [[NSDateComponentsFormatter alloc] init];
[formatter setUnitsStyle:NSDateComponentsFormatterUnitsStyleFull]; //e.g 1 month
formatter.zeroFormattingBehavior = NSDateComponentsFormatterZeroFormattingBehaviorDropAll;
NSDateComponents * dateComponents = [[NSDateComponents alloc]init];
[dateComponents setCalendar:[NSCalendar currentCalendar]];

switch (self.introductoryPrice.subscriptionPeriod.unit) {
case SKProductPeriodUnitDay:{
formatter.allowedUnits = NSCalendarUnitDay;
[dateComponents setDay:self.introductoryPrice.subscriptionPeriod.numberOfUnits];
break;
}
case SKProductPeriodUnitWeek:{
formatter.allowedUnits = NSCalendarUnitWeekOfMonth;
[dateComponents setWeekOfMonth:self.introductoryPrice.subscriptionPeriod.numberOfUnits];
break;
}
case SKProductPeriodUnitMonth:{
formatter.allowedUnits = NSCalendarUnitMonth;
[dateComponents setMonth:self.introductoryPrice.subscriptionPeriod.numberOfUnits];
break;
}
case SKProductPeriodUnitYear:{
formatter.allowedUnits = NSCalendarUnitYear;
[dateComponents setYear:self.introductoryPrice.subscriptionPeriod.numberOfUnits];
break;
}
default:{
return nil;
break;
}
break;
}
[dateComponents setValue:self.introductoryPrice.subscriptionPeriod.numberOfUnits forComponent:formatter.allowedUnits];
return [formatter stringFromDateComponents:dateComponents];
} else {
// Fallback on earlier versions
}
return nil;

}

如果您使用 SwiftyStoreKit，localizedSubscriptionPeriod是最简单的方法

import SwiftyStoreKit
product.introductoryPrice?.localizedSubscriptionPeriod // "1 week"

这是实现： https://github.com/bizz84/SwiftyStoreKit/blob/master/Sources/SwiftyStoreKit/SKProductDiscount+LocalizedPrice.swift

这是 swift 5 更紧凑、使用时间更短的版本，扩展了 SKProductSubscriptionPeriod

用法：

print("(period.localizedDescription) free trial")
//Printed example "1 week free trial"

实现：

extension SKProductSubscriptionPeriod {
public var localizedDescription: String {
let period:String = {
switch self.unit {
case .day: return "day"
case .week: return "week"
case .month: return "month"
case .year: return "year"
@unknown default:
return "unknown period"
}
}()

let plural = numberOfUnits > 1 ? "s" : ""
return "(numberOfUnits) (period)(plural)"
}
}

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