ios - 我的应用程序崩溃了……在 NSLog 中？真的吗？

Question

这听起来非常非常奇怪，但似乎是这个堆栈跟踪所暗示的。

有任何想法吗？

Thread: Unknown Name (Crashed)
0   0   libsystem_kernel.dylib              0x38a79350 __pthread_kill + 8
1   1   libsystem_c.dylib                   0x34002973 abort + 94
2   2   libsystem_c.dylib                   0x33fccf19 <redacted>
3   3   libsystem_c.dylib                   0x33fcd1dd <redacted> + 28
4   4   libsystem_c.dylib                   0x33f9977b <redacted> + 214
5   5   libsystem_c.dylib                   0x33f98773 <redacted> + 1198
6   6   libsystem_c.dylib                   0x33f98293 malloc_zone_malloc + 70
7   7   CoreFoundation                      0x36a32a10 <redacted> + 252
8   8   CoreFoundation                      0x36a33e4c <redacted> + 92
9   9   CoreFoundation                      0x3695b777 CFDictionarySetValue + 166
10  10  CoreFoundation                      0x36a27467 <redacted> + 102
11  11  CoreFoundation                      0x369a2347 CFCalendarCreateWithIdentifier + 534
12  12  CoreFoundation                      0x36a06f8b <redacted> + 106
13  13  CoreFoundation                      0x369ab021 _CFLogvEx + 188
14  14  Foundation                          0x347a5d8f NSLogv + 86
15  15  Foundation                          0x347a5d2f NSLog + 26
16  16  TypOHD                              0x000efe5f -[TypoViewControllerBase markIt:] (TypoViewControllerBase.m:325)

这就是奇怪的原因：方法中的所有 NSLog 调用都使用静态 NSString 常量。这是方法：

- (IBAction) markIt:(id)sender
{

    NSLog(@"Marking it");
    NSMutableArray *arr = [[NSMutableArray alloc] init];
    NSRange visible = [self visibleRangeOfTextView:self.source];
    NSRange last = NSMakeRange(visible.location, 0);
    //    int cursorPos = self.textView.selectedRange.location;
    NSString *text = self.source.text;
    while (true) {
        NSRange error = [controller rangeOfMisspelledWordInString:text onlyInRange:visible startingAt:last.location + last.length];
        last = error;
        if (error.location == NSNotFound || error.length == 0) {
            break;
        }
        [arr addObject:[NSValue valueWithRange:error]];
    }
    NSLog(@"Spellchecked");

    UIGraphicsBeginImageContextWithOptions(self.overlay.frame.size, NO, 0); 
    [[UIColor redColor] setStroke];
    UITextPosition *current = self.source.beginningOfDocument;
    int curTextPos = 0;
    CGFloat dash[] = {2.0f, 2.0f} ;
    int sourceLen = text.length;
    // Make the text ranges and mark them
    for (NSValue *val in arr) {
        NSRange range = [val rangeValue]; 
        if (range.location + range.length >= sourceLen) {
            break;
        }
        int toMove = range.location - curTextPos;
        UITextPosition *start = [self.source positionFromPosition:current offset:toMove];
        current = start;
        curTextPos = range.location;
        UITextPosition *end = [self.source positionFromPosition:start offset:range.length];

        UITextRange *textRange = [self.source textRangeFromPosition:start toPosition:end];
        CGRect rectInTextView = [self.source firstRectForRange:textRange];
        CGRect toDraw = rectInTextView;
        toDraw.origin.y -= self.source.contentOffset.y;
        UIBezierPath*    aPath = [UIBezierPath bezierPath];
        [aPath setLineDash:dash count:2 phase:0];

        CGPoint lineStart = toDraw.origin;
        lineStart.y += toDraw.size.height;
        CGPoint lineEnd = lineStart;
        lineEnd.x += toDraw.size.width;

        [aPath moveToPoint:lineStart];
        [aPath addLineToPoint:lineEnd];
        [aPath stroke];        
    };
    self.overlay.image = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();    
    NSLog(@"Done");
}

编辑：

一些在日志中的挖掘表明这是一种内存不足的情况，导致后来的怪异。但我怀疑内存泄漏并不是这种方法特别引起的。据我所知，它正确地释放了它的上下文，对吧？

Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGBitmapContextInfoCreate: unable to allocate 8552448 bytes for bitmap data
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetStrokeColorWithColor: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSaveGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineWidth: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineJoin: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineCap: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetMiterLimit: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetFlatness: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineDash: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextAddPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextDrawPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextRestoreGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSaveGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineWidth: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineJoin: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineCap: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetMiterLimit: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetFlatness: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineDash: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextAddPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextDrawPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextRestoreGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSaveGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineWidth: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineJoin: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineCap: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetMiterLimit: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetFlatness: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineDash: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextAddPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextDrawPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextRestoreGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSaveGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineWidth: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineJoin: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineCap: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetMiterLimit: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetFlatness: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineDash: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextAddPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextDrawPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextRestoreGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSaveGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineWidth: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineJoin: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineCap: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetMiterLimit: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetFlatness: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineDash: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextAddPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextDrawPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextRestoreGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSaveGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineWidth: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineJoin: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineCap: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetMiterLimit: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetFlatness: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineDash: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextAddPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextDrawPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextRestoreGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSaveGState: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineWidth: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineJoin: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineCap: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetMiterLimit: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetFlatness: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextSetLineDash: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextAddPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextDrawPath: invalid context 0x0
Oct  2 20:23:55 Admins-MacBook-Pro.local SkrivestotteHD[35780] <Error>: CGContextRestoreGState: invalid context 0x0
2

在 malloc_error_break 中设置断点告诉我内存不足的情况是由这一行引起的：

CGRect rectInTextView = [self.source firstRectForRange:textRange];

或者更确切地说，特别是 firstRectForRange 方法。

但是：注释掉整个 markIt 方法只会将内存不足的情况移到其他地方。我想是时候真正学习如何使用 XCode 工具来查找内存泄漏了。

ios - 我的应用程序崩溃了……在 NSLog 中？真的吗？

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