IOS开发—IOS 8 中设置applicationIconBadgeNumber和消息推送

因为在IOS8中要想设置applicationIconBadgeNumber，需要用户的授权，在IOS8中，需要加上下面的代码：

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1 2	UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil]; [[UIApplication sharedApplication] registerUserNotificationSettings:settings];

但是这两句如果是在IOS7的系统中运行的话就会报错，所以需要先判断IOS的版本，完整代码如下：

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float version = [[[UIDevice currentDevice] systemVersion] floatValue];       if (version >= 8.0) {     UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];     [[UIApplication sharedApplication] registerUserNotificationSettings:settings]; }

如果是注册消息推送的话，需要这样写：

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float version = [[[UIDevice currentDevice] systemVersion] floatValue];   if (version >= 8.0) {     UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:UIUserNotificationTypeBadge categories:nil];     [[UIApplication sharedApplication] registerUserNotificationSettings:settings];     [application registerForRemoteNotifications]; }