_notifyDelegate crash

[x122536638]

DTLazyImageView:

• (void)_notifyDelegate
  {
  if ([self.delegate respondsToSelector:@selector(lazyImageView:didChangeImageSize:)]) {
  [self.delegate lazyImageView:self didChangeImageSize:CGSizeMake(_fullWidth, _fullHeight)];
  }
  }

when DTLazyImageView.delegtate is dealloc but DTLazyImageView.delegate is not nil,

#define DT_WEAK_PROPERTY assign
This is the reason, but how to solve it

• thread Untitled #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x20)
  frame #0: 0x00000001a23e5ca0 libobjc.A.dylib`objc_retain + 16
  • frame Untitled #1: 0x0000000102836570 TangGuoApp-[DTLazyImageView _notifyDelegate](self=0x0000000105fbfd60, _cmd="_notifyDelegate") at DTLazyImageView.m:229:12 frame #2: 0x0000000102836768 TangGuoApp-[DTLazyImageView completeDownloadWithData:](self=0x0000000105fbfd60, _cmd="completeDownloadWithData:", data=540578 bytes) at DTLazyImageView.m:242:2
    frame Add HTML entity support #3: 0x00000001a2abaf94 Foundation`__NSThreadPerformPerform + 188
    frame Proper shifting of baseline for SUB and SUP #4: 0x00000001a2630d14

[odrobnik]

Looks to me you are building for a very old deployment target. If you don't use zeroing weak references, then you need to nil them yourself when the instances are deallocated.