iOS开发小技巧--iOS中设置applicationIconBadgeNumber遇到的问题

iOS中设置applicationIconBadgeNumber

• 在iOS7中直接设置applicationIconBadgeNumber没有问题,但是在iOS8之后设置applicationIconBadgeNumber,程序没有反应.
• 因为在iOS8之后想要设置applicationIconBadgeNumber,需要用户授权,在iOS8中,需要加上下面的代码:

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

• 但是这两句如果在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:

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:

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

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