ios - 使用 -ObjC/-all_load 链接器标志时找不到符号

更新到 Xcode6 后，我在 IOS 7 上遇到此代码崩溃，出现“Symbol not found: _OBJC_CLASS_$_UIUserNotificationSettings”，谁能帮忙解决一下

if ([application respondsToSelectorselector(registerUserNotificationSettings]){
    UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:  (UIUserNotificationTypeSound | UIUserNotificationTypeBadge | UIUserNotificationTypeAlert) categories:nil];
    [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
    [[UIApplication sharedApplication] registerForRemoteNotifications];
}
else {
    int notifyType = (UIRemoteNotificationTypeAlert |
                      UIRemoteNotificationTypeBadge |
                      UIRemoteNotificationTypeSound);
    [[UIApplication sharedApplication] registerForRemoteNotificationTypesUIRemoteNotificationType)notifyType];
}

编辑: 大家好， 这是运行时崩溃，而不是编译时链接错误，

异常类型:EXC_BREAKPOINT (SIGTRAP) 异常代码:0x0000000000000001、0x00000000e7ffdefe 线程触发:0

Dyld 错误消息: 未找到符号:_OBJC_CLASS_$_UIUserNotificationSettings

我使用的是 Xcode 6.0 (6A313)，所以我不应该使用任何 #if 来指示 iOS 版本。此代码在 IOS 8 模拟器上运行良好，但在 IOS 7 设备上崩溃

编辑 2:

最后，这些代码解决了这个问题，我已经在下面标记了正确的答案，谢谢 trojanfoe。

    if ([application respondsToSelectorselector(registerUserNotificationSettings])
{
    Class userNotifyClass = NSClassFromString(@"UIUserNotificationSettings");
    if(userNotifyClass != nil)
    {
        id notifyInstance = [userNotifyClass settingsForTypesUIUserNotificationTypeBadge | UIUserNotificationTypeAlert | UIUserNotificationTypeSound) categories:nil];
        [application registerUserNotificationSettings:notifyInstance];
        [application registerForRemoteNotifications];
    }
}
else
{
    int notifyType = (UIRemoteNotificationTypeAlert |
                      UIRemoteNotificationTypeBadge |
                      UIRemoteNotificationTypeSound);
    [[UIApplication sharedApplication] registerForRemoteNotificationTypesUIRemoteNotificationType)notifyType];
}

---

Best Answer-推荐答案

我认为您正在使用 'base SDK' 7.x 构建您的项目 因此，您可以将其更改为 8.0 或在编译期间检查当前版本:

#if __IPHONE_OS_VERSION_MAX_ALLOWED > __IPHONE_7_1       

    UIUserNotificationSettings *settings = [UIUserNotificationSettings settingsForTypes:  (UIUserNotificationTypeSound | UIUserNotificationTypeBadge | UIUserNotificationTypeAlert) categories:nil];
    [[UIApplication sharedApplication] registerUserNotificationSettings:settings];
    [[UIApplication sharedApplication] registerForRemoteNotifications];
#else
    int notifyType = (UIRemoteNotificationTypeAlert |
                      UIRemoteNotificationTypeBadge |
                      UIRemoteNotificationTypeSound);
    [[UIApplication sharedApplication] registerForRemoteNotificationTypesUIRemoteNotificationType)notifyType];
#endif

关于ios - 使用 -ObjC/-all_load 链接器标志时找不到符号，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/25989897/