ios - 如何显示内购项目的描述？

Question

我有一个 MasterViewController，它在表格 View 中显示应用内购买列表。每当单击表格 View 单元格时，它都会显示我的 DetailViewController，但不会显示该应用内购买项目的本地化详细描述。有没有一种方法可以根据在 tableview 单元格中按下哪个 IAP 项目，它会在 DVC 中显示该 IAP 项目的描述？

这是我的 MVC.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

这是我的 DetailViewController.h:

#import <UIKit/UIKit.h>

@interface DetailViewController : UIViewController

@property (strong, nonatomic) id detailItem;

@property (weak, nonatomic) IBOutlet UILabel *detailDescriptionLabel;
@end

还有我的 DetailViewController.m:

#import "DetailViewController.h"

@interface DetailViewController ()
- (void)configureView;
@end

@implementation DetailViewController

#pragma mark - Managing the detail item

- (void)setDetailItem:(id)newDetailItem
{
if (_detailItem != newDetailItem) {
    _detailItem = newDetailItem;

    // Update the view.
    [self configureView];
}
}

- (void)configureView
{
// Update the user interface for the detail item.

if (self.detailItem) {
    self.detailDescriptionLabel.text = [self.detailItem description];
    _detailDescriptionLabel.text = @"Please enable in app purchase in your settings";

}
}

- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
[self configureView];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

Answer 1

您应该将此方法添加到您的 MasterVC.m

- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {

    DetailViewController *dest = [segue destinationViewController];
    UITableViewCell *cell = (UITableViewCell*)sender;
    NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
    SKProduct *product = (SKProduct *) _products[indexPath.row];
    dest.detailText = product.localizedDescription;

}

在DetailVC.h中添加:

@property (nonatomic, readwrite) NSString *detailText;

在DetailVC.m中添加:

- (void)viewWillAppear:(BOOL)animated {

self.detailDescriptionLabel.text = detailText;

}

确保在 MasterVC.m 文件的顶部导入 DetailViewController.h。