Symbol not found when using -ObjC/-all_load linker flags

Question

after update to Xcode6, I got this code crash on IOS 7 with "Symbol not found: _OBJC_CLASS_$_UIUserNotificationSettings", can any one help with it

if ([application respondsToSelector:@selector(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] registerForRemoteNotificationTypes:(UIRemoteNotificationType)notifyType];
}

EDIT : hi all, it's a runtime crash, not a compile time link error,

Exception Type: EXC_BREAKPOINT (SIGTRAP) Exception Codes: 0x0000000000000001, 0x00000000e7ffdefe Triggered by Thread: 0

Dyld Error Message: Symbol not found: _OBJC_CLASS_$_UIUserNotificationSettings

and I was on Xcode 6.0 (6A313), So I should not use any #if to indicator iOS versions. And this code works fine on IOS 8 simulator, but crashes on IOS 7 devices

EDIT 2 :

Finally, this issue was fixed by these codes, I have mark the right answers below, thanks trojanfoe.

    if ([application respondsToSelector:@selector(registerUserNotificationSettings:)])
{
    Class userNotifyClass = NSClassFromString(@"UIUserNotificationSettings");
    if(userNotifyClass != nil)
    {
        id notifyInstance = [userNotifyClass settingsForTypes:(UIUserNotificationTypeBadge | UIUserNotificationTypeAlert | UIUserNotificationTypeSound) categories:nil];
        [application registerUserNotificationSettings:notifyInstance];
        [application registerForRemoteNotifications];
    }
}
else
{
    int notifyType = (UIRemoteNotificationTypeAlert |
                      UIRemoteNotificationTypeBadge |
                      UIRemoteNotificationTypeSound);
    [[UIApplication sharedApplication] registerForRemoteNotificationTypes:(UIRemoteNotificationType)notifyType];
}

hi Andy, I use iTouch 5 with 7.1.1, valid architectures armv7, base sdk IOS 8.0. — wangsihao, Sep 24 '14 at 12:06

Shmatlay Andrey · Answer 1 · 2014-09-23T08:14:29.160

2

I think you are building your project with 'base SDK' 7.x So you could change it to 8.0 or check current version during compilation:

#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] registerForRemoteNotificationTypes:(UIRemoteNotificationType)notifyType];
#endif

edited Sep 23 '14 at 08:14

answered Sep 23 '14 at 08:09

Shmatlay Andrey

212
4
13

I use "latest iOS(iOS8.0)" as the base sdk. – wangsihao Sep 23 '14 at 08:16
Maybe this answer can help you http://stackoverflow.com/questions/24043532/dyld-symbol-not-found-nsurlauthenticationmethodclientcertificate-when-trying – Shmatlay Andrey Sep 23 '14 at 09:06
thanks, I am trying with this solution, feedback later – wangsihao Sep 24 '14 at 02:21

pronebird · Answer 2 · 2014-09-24T09:33:57.530

Works for me on XCode 6.1 @ iOS 8 SDK / iOS 7 deployment target. My app uses -ObjC linker flag as well.

Just ran app on iPhone with iOS 7.1.2 / ARMV7. I use the following code:

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    if([application respondsToSelector:@selector(registerUserNotificationSettings:)]) {
        UIUserNotificationSettings* notificationSettings = [UIUserNotificationSettings settingsForTypes:(UIUserNotificationTypeBadge | UIUserNotificationTypeAlert | UIUserNotificationTypeSound) categories:nil];
        [application registerUserNotificationSettings:notificationSettings];
        [application registerForRemoteNotifications];
    } else {
        [application registerForRemoteNotificationTypes:(UIRemoteNotificationTypeBadge | UIRemoteNotificationTypeAlert | UIRemoteNotificationTypeSound)];
    }
    return YES;
}

Update: additionally tested on iPad 4 / iOS 8, iPhone 5s / iOS 8. All work fine.

score 1 · Answer 3 · answered Apr 14 '15 at 18:23

1

change UIKit.framework to optional works to me

answered Apr 14 '15 at 18:23

Ping

145
2
6

score 0 · Answer 4 · answered Sep 23 '14 at 08:02

0

UIUserNotificationSettings is available only on iOS8

if(NSClassFromString(@"UIUserNotificationSettings") != nil) 
{
    //do your stuff here
}

answered Sep 23 '14 at 08:02

Grzegorz Krukowski

18,081
5
50
71

true, but he checks the selector already. this is a linker error – Daij-Djan Sep 23 '14 at 08:03
it's true, but I already has a selector check here, and I also tried the "NSClassFromString", still a crash with same error. – wangsihao Sep 23 '14 at 08:06
dyld: Symbol not found, runtime link error, I have Xcode Version 6.0 (6A313), should I update to 6.0.1 and have a try? – wangsihao Sep 23 '14 at 08:07

score 0 · Accepted Answer · edited May 23 '17 at 10:26

~~You must be compiling with an iOS SDK version less than 8 in order to get that link error.~~

To fix the issue use the iOS 8 SDK (i.e. Xcode 6) and check that the class exists at runtime using:

if (NSClassFromString(@"UIUserNotificationSettings")) {
    // do thing
}

EDIT After further information from the OP:

He is using Xcode 6 and the iOS 8 SDK.
He is using the -ObjC and -all_load Other Linker Flag.

It's the -ObjC/-all_load flags that stops the usual techniques of testing for a class to exist at runtime and using it selectively.

In order for the app to support iOS 7 and iOS 8 with -ObjC semantics, I can think of two solutions:

Remove the use of -ObjC/-all_load linker flags in favour of -force_load, as that targets a specific library for "all load" (see my question here).
Use a more dynamic (and error prone) approach of:
1. Creating an instance of UIUserNotificationSettings using NSClassFromString().
2. Calling methods with performSelector.

I would favour the first approach.

hi, it's a runtime crash, something "weak link", not a compile time error — wangsihao, Sep 23 '14 at 08:17
hi trojanfoe, I finally solve this problem by the second approach you motioned "Use a more dynamic (and error prone) approach of". I will put my code in the question's edit section. Thanks. — wangsihao, Sep 24 '14 at 02:36

Symbol not found when using -ObjC/-all_load linker flags

5 Answers5