摘要: 在IOS7中設(shè)置applicationIconBadgeNumber不會(huì)有什么問(wèn)題，但是直接在IOS8中設(shè)置applicationIconBadgeNumber會(huì)報(bào)錯(cuò)

因?yàn)樵贗OS8中要想設(shè)置applicationIconBadgeNumber，需要用戶的授權(quán)，在IOS8中，需要加上下面的代碼：

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

UIApplication *app = [UIApplication sharedApplication];
// 應(yīng)用程序右上角數(shù)字
app.applicationIconBadgeNumber = 0;

但是這兩句如果是在IOS7的系統(tǒng)中運(yùn)行的話就會(huì)報(bào)錯(cuò)，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];
}

UIApplication *app = [UIApplication sharedApplication];
// 應(yīng)用程序右上角數(shù)字
app.applicationIconBadgeNumber = 0;

如果是注冊(cè)消息推送的話，需要這樣寫(xiě)：

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

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

UIApplication *app = [UIApplication sharedApplication];
// 應(yīng)用程序右上角數(shù)字
app.applicationIconBadgeNumber = 0;