我的应用程序中有一个用于删除广告横幅的应用程序内购买，当我成功购买并返回到我的主视图 Controller 时，广告没有被删除但是当我退出应用程序并重新打开它时，广告消失了，并保持消失。几乎就像它记得我在下一次加载时购买了移除广告 IAP，但不是在购买后立即购买。一个非常聪明的人告诉我我需要这样做:

So now all you have to do is call the code that is located in the viewWillAppear / viewDidLoad methods once you return to your VC after purchasing the IAP. How you do that is up to you. If you need help with that I would suggest asking a new question since this comment thread is getting very long. I'd appreciate if you upvote my answer and choose it as the correct answer since I've helped you get this working.

关于如何做到这一点有什么想法吗？

谢谢!

这是我的主视图 Controller 的屏幕截图:

ViewController.h

#import <UIKit/UIKit.h>
#import <StoreKit/StoreKit.h>
#import <CoreMotion/CoreMotion.h>
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>


@interface ViewController : UIViewController <UIWebViewDelegate, MKMapViewDelegate, CLLocationManagerDelegate>

@property (strong, nonatomic) IBOutlet UIWebView *viewWeb;
@property (nonatomic, strong) CLLocationManager *locationManager;
@property (nonatomic, strong) CLLocation *currentLocation;
@property (weak, nonatomic) IBOutlet UIImageView *PokeABowlAd;


@end

ViewController.m:

#define SHOW_ADS_KEY @"Show Ads Key"
#define k_Save @"Saveitem"


#import "ViewController.h"
#import <AVFoundation/AVFoundation.h>

@interface ViewController () <UITextViewDelegate>


@end

@implementation ViewController

@synthesize viewWeb;

- (void)viewDidLoad {
[super viewDidLoad];

UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
[self.navigationItem setBackBarButtonItem:backButtonItem];


NSString *fullURL = @"https://www.google.com";
NSURL *url = [NSURL URLWithString:fullURL];
NSURLRequest *requestObj = [NSURLRequest requestWithURL:url];
viewWeb.scalesPageToFit = YES;
viewWeb.scrollView.bounces = NO;
[viewWeb loadRequest:requestObj];
}

#pragma mark - CLLocationManagerDelegate
// Wait for location callbacks
- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
NSLog(@"%@", [locations lastObject]);
}

-(void)motionBegan:(UIEventSubtype)motion withEvent:(UIEvent *)event {

if (event.type == UIEventSubtypeMotionShake) {
    NSString *jsString = [NSString stringWithContentsOfURL:[[NSBundle mainBundle] URLForResource:@"iitc" withExtension:@"js"] encoding:NSUTF8StringEncoding error:nil];
    [viewWeb stringByEvaluatingJavaScriptFromString:jsString];
}
}



- (NSUInteger)supportedInterfaceOrientations {
if ([[UIDevice currentDevice] userInterfaceIdiom] == UIUserInterfaceIdiomPhone) {
    return UIInterfaceOrientationMaskAllButUpsideDown;
} else {
    return UIInterfaceOrientationMaskAll;
}
}


- (IBAction)PokeABowlAd:(id)sender {
if (![[[NSUserDefaults standardUserDefaults] objectForKey:SHOW_ADS_KEY]  isEqualToString: @"No"]){ // NEW CODE
    // Code to show ads
    _PokeABowlAd.hidden = NO;

    [[UIApplication sharedApplication] openURL:[NSURL URLWithString: @"http://www.pokeabowl.com/"]];
} else {
    _PokeABowlAd.hidden = YES;
}
NSLog(@"Shows ads?: %@", [[NSUserDefaults standardUserDefaults] objectForKey:SHOW_ADS_KEY]);

}

- (void)viewWillAppear {
if (![[[NSUserDefaults standardUserDefaults] objectForKey:SHOW_ADS_KEY] isEqualToString: @"No"]){ // NEW CODE
    // Code to show ads
    _PokeABowlAd.hidden = NO;

} else {
    _PokeABowlAd.hidden = YES;
}
NSLog(@"Shows ads?: %@", [[NSUserDefaults standardUserDefaults] objectForKey:SHOW_ADS_KEY]);
}


@end

MasterViewController.m:

    #import "MasterViewController.h"
#import "DetailViewController.h"
#import "RageIAPHelper.h"
#import <StoreKit/StoreKit.h>

@interface MasterViewController () {
NSArray *_products;
NSNumberFormatter * _priceFormatter;
}
@end

@implementation MasterViewController

- (void)viewDidLoad
{
[super viewDidLoad];

UIBarButtonItem *backButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"" style:UIBarButtonItemStylePlain target:nil action:nil];
[self.navigationItem setBackBarButtonItem:backButtonItem];

self.title = @"Settings";

self.refreshControl = [[UIRefreshControl alloc] init];
[self.refreshControl addTarget:self action:@selector(reload) forControlEvents:UIControlEventValueChanged];
[self reload];
[self.refreshControl beginRefreshing];

_priceFormatter = [[NSNumberFormatter alloc] init];
[_priceFormatter setFormatterBehavior:NSNumberFormatterBehavior10_4];
[_priceFormatter setNumberStyle:NSNumberFormatterCurrencyStyle];

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Restore" style:UIBarButtonItemStylePlain target:self action:@selector(restoreTapped:)];

}

- (void)restoreTapped:(id)sender {
[[RageIAPHelper sharedInstance] restoreCompletedTransactions];
}

- (void)viewWillAppear:(BOOL)animated {
[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(productPurchased:) name:IAPHelperProductPurchasedNotification object:nil];
}

- (void)viewWillDisappear:(BOOL)animated {
[[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)productPurchased:(NSNotification *)notification {

NSString * productIdentifier = notification.object;
[_products enumerateObjectsUsingBlock:^(SKProduct * product, NSUInteger idx, BOOL *stop) {
    if ([product.productIdentifier isEqualToString:productIdentifier]) {
        [self.tableView reloadRowsAtIndexPaths:@[[NSIndexPath indexPathForRow:idx inSection:0]] withRowAnimation:UITableViewRowAnimationFade];
        *stop = YES;
    }
}];

}

- (void)reload {
_products = nil;
[self.tableView reloadData];
[[RageIAPHelper sharedInstance] requestProductsWithCompletionHandler:^(BOOL success, NSArray *products) {
    if (success) {
        _products = products;
        [self.tableView reloadData];
    }
    [self.refreshControl endRefreshing];
}];
}

#pragma mark - Table View

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
return 1;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return _products.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"Cell" forIndexPath:indexPath];

SKProduct * product = (SKProduct *) _products[indexPath.row];
cell.textLabel.text = product.localizedTitle;
[_priceFormatter setLocale:product.priceLocale];
cell.detailTextLabel.text = [_priceFormatter stringFromNumber:product.price];

if ([[RageIAPHelper sharedInstance] productPurchased:product.productIdentifier]) {
    cell.accessoryType = UITableViewCellAccessoryCheckmark;
    cell.accessoryView = nil;
} else {
    UIButton *buyButton = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    buyButton.frame = CGRectMake(0, 0, 72, 37);
    [buyButton setTitle:@"Buy" forState:UIControlStateNormal];
    buyButton.tag = indexPath.row;
    [buyButton addTarget:self action:@selector(buyButtonTapped:) forControlEvents:UIControlEventTouchUpInside];
    cell.accessoryType = UITableViewCellAccessoryNone;
    cell.accessoryView = buyButton;
}

return cell;
}

- (void)buyButtonTapped:(id)sender {

UIButton *buyButton = (UIButton *)sender;
SKProduct *product = _products[buyButton.tag];

NSLog(@"Buying %@...", product.productIdentifier);
[[RageIAPHelper sharedInstance] buyProduct:product];

}

@end

IAPHelper.h:

    #import <StoreKit/StoreKit.h>


UIKIT_EXTERN NSString *const IAPHelperProductPurchasedNotification;

typedef void (^RequestProductsCompletionHandler)(BOOL success, NSArray * products);

@interface IAPHelper : NSObject

- (id)initWithProductIdentifiers:(NSSet *)productIdentifiers;
- (void)requestProductsWithCompletionHandler:(RequestProductsCompletionHandler)completionHandler;
- (void)buyProduct:(SKProduct *)product;
- (BOOL)productPurchased:(NSString *)productIdentifier;
- (void)restoreCompletedTransactions;
@property (weak, nonatomic) IBOutlet UIImageView *PokeABowlAd;

@end

IAPHelper.m:

    #define SHOW_ADS_KEY @"Show Ads Key"

// 1
#import "IAPHelper.h"
#import <StoreKit/StoreKit.h>

NSString *const IAPHelperProductPurchasedNotification = @"IAPHelperProductPurchasedNotification";

// 2
@interface IAPHelper () <SKProductsRequestDelegate, SKPaymentTransactionObserver>
@end

// 3
@implementation IAPHelper {
SKProductsRequest * _productsRequest;
RequestProductsCompletionHandler _completionHandler;

NSSet * _productIdentifiers;
NSMutableSet * _purchasedProductIdentifiers;
}




- (id)initWithProductIdentifiers:(NSSet *)productIdentifiers {

if ((self = [super init])) {

    // Store product identifiers
    _productIdentifiers = productIdentifiers;

    // Check for previously purchased products
    _purchasedProductIdentifiers = [NSMutableSet set];
    for (NSString * productIdentifier in _productIdentifiers) {
        BOOL productPurchased = [[NSUserDefaults standardUserDefaults]     boolForKey:productIdentifier];
        if (productPurchased) {
            [_purchasedProductIdentifiers addObject:productIdentifier];
            NSLog(@"Previously purchased: %@", productIdentifier);
            // NEW CODE
            if ([productIdentifier isEqualToString:@"Ads"]){
                [[NSUserDefaults standardUserDefaults] setObject: @"No" forKey:SHOW_ADS_KEY];
                [[NSUserDefaults standardUserDefaults] synchronize];
            }
            // NEW CODE ^^

        } else {
            NSLog(@"Not purchased: %@", productIdentifier);
        }
    }

    // Add self as transaction observer
    [[SKPaymentQueue defaultQueue] addTransactionObserver:self];
}
return self;
}


- (void)requestProductsWithCompletionHandler:(RequestProductsCompletionHandler)completionHandler {


// 1
_completionHandler = [completionHandler copy];

// 2
_productsRequest = [[SKProductsRequest alloc] initWithProductIdentifiers:_productIdentifiers];
_productsRequest.delegate = self;
[_productsRequest start];

}

- (BOOL)productPurchased:(NSString *)productIdentifier {
return [_purchasedProductIdentifiers containsObject:productIdentifier];
}

- (void)buyProduct:(SKProduct *)product {

NSLog(@"Buying %@...", product.productIdentifier);

SKPayment * payment = [SKPayment paymentWithProduct:product];
[[SKPaymentQueue defaultQueue] addPayment:payment];

}

#pragma mark - SKProductsRequestDelegate

- (void)productsRequest:(SKProductsRequest *)request didReceiveResponse:(SKProductsResponse *)response {

NSLog(@"Loaded list of products...");
_productsRequest = nil;

NSArray * skProducts = response.products;
for (SKProduct * skProduct in skProducts) {
    NSLog(@"Found product: %@ %@ %0.2f",
          skProduct.productIdentifier,
          skProduct.localizedTitle,
          skProduct.price.floatValue);
}

_completionHandler(YES, skProducts);
_completionHandler = nil;

}

- (void)request:(SKRequest *)request didFailWithError:(NSError *)error {

NSLog(@"Failed to load list of products.");
_productsRequest = nil;

_completionHandler(NO, nil);
_completionHandler = nil;

}

#pragma mark SKPaymentTransactionOBserver

- (void)paymentQueue:(SKPaymentQueue *)queue updatedTransactions:(NSArray *)transactions
{
for (SKPaymentTransaction * transaction in transactions) {
    switch (transaction.transactionState)
    {
        case SKPaymentTransactionStatePurchased:
            [self completeTransaction:transaction];
            break;
        case SKPaymentTransactionStateFailed:
            [self failedTransaction:transaction];
            break;
        case SKPaymentTransactionStateRestored:
            [self restoreTransaction:transaction];
        default:
            break;
    }
};
}

- (void)completeTransaction:(SKPaymentTransaction *)transaction {
NSLog(@"completeTransaction...");

[self provideContentForProductIdentifier:transaction.payment.productIdentifier];
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
}

- (void)restoreTransaction:(SKPaymentTransaction *)transaction {
NSLog(@"restoreTransaction...");

[self provideContentForProductIdentifier:transaction.originalTransaction.payment.productIdentifier];
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
}

- (void)failedTransaction:(SKPaymentTransaction *)transaction {

NSLog(@"failedTransaction...");
if (transaction.error.code != SKErrorPaymentCancelled)
{
    NSLog(@"Transaction error: %@", transaction.error.localizedDescription);
}

[[SKPaymentQueue defaultQueue] finishTransaction: transaction];
}

- (void)provideContentForProductIdentifier:(NSString *)productIdentifier {

[_purchasedProductIdentifiers addObject:productIdentifier];
[[NSUserDefaults standardUserDefaults] setBool:YES forKey:productIdentifier];
[[NSUserDefaults standardUserDefaults] synchronize];
[[NSNotificationCenter defaultCenter] postNotificationName:IAPHelperProductPurchasedNotification object:productIdentifier userInfo:nil];

}

- (void)restoreCompletedTransactions {
[[SKPaymentQueue defaultQueue] restoreCompletedTransactions];
}

@end

RageIAPHelper.h

    #import "IAPHelper.h"

@interface RageIAPHelper : IAPHelper

+ (RageIAPHelper *)sharedInstance;

@end

RageIAPHelper.m

    #import "RageIAPHelper.h"
#import "ViewController.h"

@implementation RageIAPHelper

+ (RageIAPHelper *)sharedInstance {
static dispatch_once_t once;
static RageIAPHelper * sharedInstance;
dispatch_once(&once, ^{
    NSSet * productIdentifiers = [NSSet setWithObjects:
                                  @“com.GPS.iapra",
                                  @"com.GPS.iapb”,
                                  nil];
    sharedInstance = [[self alloc] initWithProductIdentifiers:productIdentifiers];
});
return sharedInstance;
}

@end

最佳答案

所以我认为发生的事情是，直到调用 IAP.m 中的 initWithProductIdentifers 方法(仅在您加载应用程序时才会发生)，它才识别您的购买。

因此在 IAP.m 中尝试修改:

- (void)completeTransaction:(SKPaymentTransaction *)transaction {
NSLog(@"completeTransaction...");

[self provideContentForProductIdentifier:transaction.payment.productIdentifier];
[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
}

收件人:

- (void)completeTransaction:(SKPaymentTransaction *)transaction {
NSLog(@"completeTransaction...");

[self provideContentForProductIdentifier:transaction.payment.productIdentifier];

        // NEW CODE
            if ([transaction.payment.productIdentifier isEqualToString:@"Ads"]){
                [[NSUserDefaults standardUserDefaults] setObject: @"No" forKey:SHOW_ADS_KEY];
                [[NSUserDefaults standardUserDefaults] synchronize];
            }
        // NEW CODE ^^

[[SKPaymentQueue defaultQueue] finishTransaction:transaction];
}

此外，我认为您的 viewWillAppear 未被调用的原因是因为您的 Storyboard 中似乎有两个 NavigationController。尝试删除第二个(VC 和 MasterVC 之间的那个)。如果您同时执行这两项操作，应该会成功。

关于ios - 购买应用内购买后保存更改，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/31975790/