iOS開發小技巧--iOS中設置applicationIconBadgeNumber遇到的問題

iOS中設置applicationIconBadgeNumber

• 在iOS7中直接設置applicationIconBadgeNumber沒有問題,但是在iOS8之后設置applicationIconBadgeNumber,程序沒有反應.
• 因為在iOS8之后想要設置applicationIconBadgeNumber,需要用戶授權,在iOS8中,需要加上下面的代碼:

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

• 但是這兩句如果在iOS7的系統中運行的話就會報錯,所以需要先判斷iOS的版本,完整代碼如下:

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

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

• 如果是注冊消息推送的話,需要這樣寫:

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

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