如何在Keychain的App购买状态下保存

- (void)savePurchaseStatus:(BOOL)status {
    NSData *statusData = [NSData dataWithBytes:&status length:sizeof(BOOL)];
    
    NSDictionary *query = @{
        (__bridge id)kSecClass: (__bridge id)kSecClassGenericPassword,
        (__bridge id)kSecAttrService: @"com.example.app.purchase",
        (__bridge id)kSecAttrAccount: @"purchaseStatus",
        (__bridge id)kSecValueData: statusData,
        (__bridge id)kSecAttrAccessible: (__bridge id)kSecAttrAccessibleAfterFirstUnlock
    };
    
    OSStatus status = SecItemAdd((__bridge CFDictionaryRef)query, NULL);
    if (status != errSecSuccess) {
        NSLog(@"Failed to save purchase status to Keychain");
    }
}

- (BOOL)retrievePurchaseStatus {
    NSDictionary *query = @{
        (__bridge id)kSecClass: (__bridge id)kSecClassGenericPassword,
        (__bridge id)kSecAttrService: @"com.example.app.purchase",
        (__bridge id)kSecAttrAccount: @"purchaseStatus",
        (__bridge id)kSecReturnData: (__bridge id)kCFBooleanTrue,
        (__bridge id)kSecMatchLimit: (__bridge id)kSecMatchLimitOne
    };
    
    CFTypeRef result = NULL;
    OSStatus status = SecItemCopyMatching((__bridge CFDictionaryRef)query, &result);
    if (status == errSecSuccess && result != NULL) {
        NSData *statusData = (__bridge_transfer NSData *)result;
        BOOL purchaseStatus;
        [statusData getBytes:&purchaseStatus length:sizeof(BOOL)];
        return purchaseStatus;
    } else {
        NSLog(@"Failed to retrieve purchase status from Keychain");
        return NO;
    }
}

// 保存购买状态
[self savePurchaseStatus:YES];

// 获取购买状态
BOOL purchaseStatus = [self retrievePurchaseStatus];