Weird MFMailComposeViewController Crash

Question

Following lines are crashing on iPad. I am using Xcode 4.6.3 (4H1503) with 6.0 as target OS platform. It used to work just fine!

if ([MFMailComposeViewController canSendMail]) {
    MFMailComposeViewController *mailViewController = [[MFMailComposeViewController alloc] init];
    [self presentViewController:mailViewController animated:YES completion:nil];
}

With following exceptions:

2013-09-04 02:30:47.489 MyProject[38633:5b0b] * Assertion failure in NSDictionary *_UIRecordArgumentOfInvocationAtIndex(NSInvocation *, NSUInteger, BOOL)(), /SourceCache/UIKit_Sim/UIKit-2380.17/UIAppearance.m:1118

2013-09-04 02:31:00.816 MyProject[38633:5b0b] * Terminating app due to uncaught exception 'NSInternalInconsistencyException', reason: 'Unknown key, "{size = 13.000000, traits = 00000000}" in title text attributes dictionary'

EDIT: Its crashing due to the following lines. Any guess why? Never thought MFMailComposeViewController could have any relation to UITabBarItem ...

NSDictionary *textAttributesDict = @{ [UIColor whiteColor] : UITextAttributeTextColor,
                                          [UIFont systemFontOfSize:13.0f] : UITextAttributeFont};

[[UITabBarItem appearance] setTitleTextAttributes:textAttributesDict forState:UIControlStateSelected];
[[UITabBarItem appearance] setTitleTextAttributes:textAttributesDict forState:UIControlStateNormal]`;

Have you checked that the device can send mail? Does your compose view have a delegate? — David Rönnqvist, Sep 04 '13 at 07:50
The exception mentions UIAppearance. Have you customized the appearance of any controls that may be used by the compose view? (navigation bars for example)? If so, how? — David Rönnqvist, Sep 04 '13 at 07:51
Yes checking if device can send email. Not changing navigation bar appearance in anyway either. — Yas Tabasam, Sep 04 '13 at 08:08
+1 David Rönnqvist: Fixed. Updated my question, thanks for the pointer! — Yas Tabasam, Sep 04 '13 at 08:18
You might want to show `textAttributesDict` as well. Seems like something's wrong with it. — Desdenova, Sep 04 '13 at 08:19
You keys and objects should be the other way around. Like this `@{key: object, ...}` — Desdenova, Sep 04 '13 at 08:28
+1 Desdenova: haha, got it. Did not notice that, thanks man. — Yas Tabasam, Sep 04 '13 at 08:29
No problem, happens all the time since the initializer is other way around `initWithObjectsAndKeys:` — Desdenova, Sep 04 '13 at 08:31

score 1 · Accepted Answer · answered Sep 16 '13 at 17:16

The NSDictionary had key/value reversed. It is supposed to have key:value instead of value:key

NSDictionary *textAttributesDict = @{ [UIColor whiteColor] : UITextAttributeTextColor,
                                          [UIFont systemFontOfSize:13.0f] : UITextAttributeFont};

Changing above to the following worked. Thanks Desdenova for a pointer.

NSDictionary *textAttributesDict = @{UITextAttributeTextColor : [UIColor whiteColor],
                                          UITextAttributeFont : [UIFont systemFontOfSize:13.0f]};

Weird MFMailComposeViewController Crash

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