iPhone应用程序无法在iPad上运行

Question

I've encountered problem when running iPhone only apps to iPad. The error from crash log is

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Subtype: KERN_PROTECTION_FAILURE at 0x00ac3ff8
Triggered by Thread:  0

Thread 0 name:  Dispatch queue: com.apple.main-thread
Thread 0 Crashed:
0   libsystem_malloc.dylib          0x38cccdd4 allocate_pages + 352
1   libsystem_malloc.dylib          0x38cccace large_malloc + 70
2   libsystem_malloc.dylib          0x38cc83ee szone_malloc_should_clear + 1362
3   libsystem_malloc.dylib          0x38cc7e68 malloc_zone_malloc + 88
4   CoreFoundation                  0x2aa24ea2 __CFStringChangeSizeMultiple + 866
5   CoreFoundation                  0x2a983554 CFStringCreateMutableCopy + 408
6   CoreFoundation                  0x2a99abba -[__NSCFString mutableCopyWithZone:] + 22
7   MyApp                       0x006a274c 0xa3000 + 6289228
8   MyApp                       0x006a2a7e 0xa3000 + 6290046
9   MyApp                       0x006a2800 0xa3000 + 6289408
10  MyApp                       0x006a2a7e 0xa3000 + 6290046
11  MyApp                       0x006a2800 0xa3000 + 6289408
12  MyApp                       0x006a2a7e 0xa3000 + 6290046
13  MyApp                       0x006a2800 0xa3000 + 6289408
14  MyApp                       0x006a2a7e 0xa3000 + 6290046
15  MyApp                       0x006a2800 0xa3000 + 6289408
16  MyApp                       0x006a2a7e 0xa3000 + 6290046
17  MyApp                       0x006a2800 0xa3000 + 6289408
18  MyApp                       0x006a2a7e 0xa3000 + 6290046
19  MyApp                       0x006a2800 0xa3000 + 6289408
20  MyApp                       0x006a2a7e 0xa3000 + 6290046
21  MyApp                       0x006a2800 0xa3000 + 6289408
22  MyApp                       0x006a2a7e 0xa3000 + 6290046
23  MyApp                       0x006a2800 0xa3000 + 6289408
24  MyApp                       0x006a2a7e 0xa3000 + 6290046

In the XCode, the crashed cause by '[UIImage imageNamed]'. Which confused me. I wonder how to debug and fix this kind of error

UPDATE :

the breakpoint stop at this line of code

- (UIButton *)customBackButton
{
UIImage *buttonImage = [UIImage imageNamed:@"actionbar_back_nor.png"];
    UIImage *buttonImagePressed = [UIImage imageNamed:@"actionbar_back_pre.png"];
    UIButton *aButton = [UIButton buttonWithType:UIButtonTypeCustom];
    [aButton setImage:buttonImage forState:UIControlStateNormal];
    [aButton setImage:buttonImagePressed forState:UIControlStateHighlighted];
    aButton.frame = CGRectMake(0.0,0.0,44,44);
    UIEdgeInsets insets;
    if (IOS_VERSION_7_OR_BETTER) {
        insets = UIEdgeInsetsMake(11, 0, 11, 22);
    }else{
        insets = UIEdgeInsetsMake(11, 11, 11, 11);
    }

    aButton.imageEdgeInsets = insets;

    [aButton addTarget:self action:@selector(back) forControlEvents:UIControlEventTouchUpInside];
}

I changed the '[UIImage imageNamed:]' to '[UIImage imageWithContentsOfFile:]' and the things run normal. Why the '[UIImage imageNamed:]' cause this error?

Answer 1

The problem is you send the message to UIImage (call static function) with invalid parameter. For sure.

That's why you are getting error on -[__NSCFString mutableCopyWithZone:] , because [UIImage imageNamed:] expects NSString parameter, but gets something wrong.

So please post your code.

Update

Since you've said that you compiled your app for iPhone only and run it on iPad, I think the problem is in image lookup on iPad. Unfortunately I can't go deeper, but according to this document https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/LoadingResources/ImageSoundResources/ImageSoundResources.html we know that iPad looks up for iPad-specific resources first. So I'm not sure, but it seems like [UIImage imageNamed:] confuses somewhere at this point. You can try to copy your actionbar_back_nor.png and actionbar_back_pre.png to actionbar_back_nor~ipad.png and actionbar_back_pre~ipad.png .

I am not sure, but this seems like the only point where reason can be hidden.

But problem is very interesting and I'll research it for myself in a few days. So if you will need more information, we can be in touch.

Answer 2

只需添加异常断点，它将确切显示代码崩溃的位置，然后使用强大的调试器。