iOS-解决iOS8及以上设置applicationIconBadgeNumber报错的问题

 

在IOS7中设置applicationIconBadgeNumber不会有什么问题，可是直接在IOS8中设置applicationIconBadgeNumber会报错。由于在IOS8中要想设置applicationIconBadgeNumber，须要用户的受权，在IOS8中，须要加上下面的代码：

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

可是这两句若是是在IOS7的系统中运行的话就会报错，因此须要先判断IOS的版本，完整代码以下：

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

若是是注册消息推送的话，须要这样写：

float version = [[[UIDevice currentDevice] systemVersion] floatValue];

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