（转）iOS内购(iap)总结

//
//  IAPManager.m
//  SpeakEnglish
//
//  Created by Daniel on 16/6/8.
//  Copyright © 2016年 Daniel. All rights reserved.
//

#import "IAPManager.h"
#import <StoreKit/StoreKit.h>

@interface IAPManager ()<SKPaymentTransactionObserver, SKProductsRequestDelegate>
// 所有商品
@property (nonatomic, strong)NSArray *products;
@property (nonatomic, strong)SKProductsRequest *request;
@end

static IAPManager *manager = nil;

@implementation IAPManager

+ (instancetype)shareIAPManager {
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
        manager = [self new];
        [[SKPaymentQueue defaultQueue] addTransactionObserver:manager];
    });
    return manager;
}

- (void)dealloc {
    [[SKPaymentQueue defaultQueue] removeTransactionObserver:self];
}

// 请求可卖的商品
- (void)requestProducts
{
    if (![SKPaymentQueue canMakePayments]) {
        // 您的手机没有打开程序内付费购买
        return;
    }
    
    // 1.请求所有的商品ID
    NSString *productFilePath = [[NSBundle mainBundle] pathForResource:@"iapdemo.plist" ofType:nil];
    NSArray *products = [NSArray arrayWithContentsOfFile:productFilePath];
    
    // 2.获取所有的productid
     NSArray *productIds = [products valueForKeyPath:@"productId"];
    
    // 3.获取productid的set(集合中)
    NSSet *set = [NSSet setWithArray:productIds];
    
    // 4.向苹果发送请求,请求可卖商品
    _request = [[SKProductsRequest alloc] initWithProductIdentifiers:set];
    _request.delegate = self;
    [_request start];
}

/**
 *  当请求到可卖商品的结果会执行该方法
 *
 *  @param response response中存储了可卖商品的结果
 */
- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response
{
     for (SKProduct *product in response.products) {

    // 用来保存价格
    NSMutableDictionary *priceDic = @{}.mutableCopy;
    // 货币单位
    NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init];
    [numberFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
    [numberFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];
    [numberFormatter setLocale:product.priceLocale];
    // 带有货币单位的价格
    NSString *formattedPrice = [numberFormatter stringFromNumber:product.price];
        [priceDic setObject:formattedPrice forKey:product.productIdentifier];

     NSLog(@"价格:%@", product.price);
     NSLog(@"标题:%@", product.localizedTitle);
     NSLog(@"秒速:%@", product.localizedDescription);
     NSLog(@"productid:%@", product.productIdentifier);
     }
     
    // 保存价格列表
    [[NSUserDefaults standardUserDefaults] setObject:priceDic forKey:@"priceDic"]