iOS推送出了点问题，之前还好好的，而且上线过好几版了，最近测试说iOS好多用户收不到推送了，然后Debug发现：既不调用- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken方法，也不调用- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error 方法。之前在Xcode6上还好好的，升级到Xcode7之后就这两个方法都调用不进去了。然后再用Xcode6打开也同样调不进去了。升级到Xcode7之后，在适配iOS9的时候改过一些配置文件。

首先说明几点：
1，已经确保证书没问题，因为我新建了个测试工程，用同一个证书却可以调用- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken方法。并且原来的项目和新建的测试工程在- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions方法中的代码是一模一样的。测试工程能回调- (void)application:(UIApplication *)application didRegisterForRemoteNotificationsWithDeviceToken:(NSData *)deviceToken方法，但原项目不回调，也不调用- (void)application:(UIApplication *)application didFailToRegisterForRemoteNotificationsWithError:(NSError *)error方法。

2，确定手机已经联网。

3，也有是否接受消息通知的弹窗，而且设置－通知里边确定是允许推送的。

补充，原项目和新建的测试工程在- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions方法中的代码一模一样，如下：

• (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
  #ifdef __IPHONE_8_0
  if ([[UIApplication sharedApplication] respondsToSelector:@selector(registerUserNotificationSettings:)]) {
  UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge|UIUserNotificationTypeSound|UIUserNotificationTypeAlert categories:nil];
  [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
  } else {
  UIRemoteNotificationType myTypes = UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound;
  [[UIApplication sharedApplication] registerForRemoteNotificationTypes:myTypes];
  }
  #else
  UIRemoteNotificationType myTypes = UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound;
  [[UIApplication sharedApplication] registerForRemoteNotificationTypes:myTypes];
  #endif

  return YES;
  }

如有人遇到同样的问题，请帮忙解答，非常感谢！