ios - SKStoreProductViewController 取消按钮崩溃或不工作

Question

我已经为 SKStoreProductViewController 实现了一个委托(delegate)。我将该 View Controller 添加到关键窗口的 View Controller 中。我还在委托(delegate)函数中实现了关闭 View Controller 代码。

问题似乎是这个问题的答案。
Modal App Store won't dismiss
然而，这个问题仍然存在于我的情况中。

显示功能

if (floor(NSFoundationVersionNumber) > NSFoundationVersionNumber_iOS_6_1) {
    NSString *appURL = [NSString stringWithFormat:@"itms-apps://itunes.apple.com/%@/app/id%@",
                        [[NSLocale preferredLanguages] objectAtIndex:0], applicationID];
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:appURL]];

} else {
    NSDictionary* dict = [NSDictionary dictionaryWithObject:applicationID forKey:SKStoreProductParameterITunesItemIdentifier];
    SKStoreProductViewController *viewCont = [[SKStoreProductViewController alloc] init];
    viewCont.delegate = self;
    [viewCont loadProductWithParameters:dict completionBlock:^(BOOL result, NSError *error)
    {
        UIViewController* viewController = [UIApplication sharedApplication].keyWindow.rootViewController;
        if (viewController)
        { [viewController presentViewController:viewCont animated:YES completion:nil]; }
    }];
}

委托(delegate)函数

- (void)productViewControllerDidFinish:(SKStoreProductViewController *)viewController
{
    if (viewController)
    { [viewController dismissViewControllerAnimated:YES completion:nil]; }
}

Answer 1

问题是你必须实现

- (void)productViewControllerDidFinish:(SKStoreProductViewController *)viewController
{
    if (viewController)
    { [self dismissViewControllerAnimated:YES completion:nil]; }
}

在委托(delegate)类中。如果您在委托(delegate)呈现 SKStoreProductViewController 的类中实现它，它将无法工作，因为 SKStoreProductViewController 将尝试在其委托(delegate)中调用 productViewControllerDidFinish: ，它没有实现该方法。

举个例子:

@implementation MainViewController

- (void)presentSecondViewController
{
     SecondViewController *secondViewController = [[SecondViewController alloc] initWithNibName:@"SecondViewController" bundle:nil];
     [secondViewController setDelegate:self];
     [self presentViewController:secondViewController animated:YES completion:nil];
}

- (void)productViewControllerDidFinish:(SKStoreProductViewController *)viewController
{
    if (viewController)
    { [self dismissViewControllerAnimated:YES completion:nil]; }
}

@end


@implementation SecondViewController {
    id delegate <SKStoreProductViewControllerDelegate>;
}

- (void)setDelegate:(id)delegate
{
    _delegate = delegate;
}

- (void)callStoreProductViewController
{
    SKStoreProductViewController *viewCont = [[SKStoreProductViewController alloc] init];
    viewCont.delegate = _delegate;
    [viewCont loadProductWithParameters:dict completionBlock:^(BOOL result, NSError *error)
    {
        UIViewController* viewController = [UIApplication sharedApplication].keyWindow.rootViewController;
        if (viewController)
            { [_delegate presentViewController:viewCont animated:YES completion:nil]; }
    }];
}
@end

所以，如果我确实很好地理解了你的问题，你必须在你的 viewController 类中实现 productViewControllerDidFinish:，因为它是 presentig 的 SKStoreProductViewController 。

希望这对您有所帮助!