I've got a fairly simply application, with IKImageBrowserView embedded in
NSScrollView, as is the most common case. When running on macOS 10.13 High
Sierra GM and whenever the IKImageBrowserView is presented and there are enough
items in it to make it scrollable, it throws and exception with the following
stack trace:
NSInvalidArgumentException
*** -[NSProxy doesNotRecognizeSelector:lastIndex] called!
0x7fff59b71b27 0x7fff7e452c76 0x7fff57c65bfd 0x7fff57b4a510 0x7fff57b49ed8
0x7fff62254b98 0x7fff62288543 0x7fff6226b819 0x7fff59bc66d8 0x7fff7f2cb6c1
0x7fff7f2cb56d 0x7fff7f2cac5d
NSExceptionHandlerExceptionRaiser (in ExceptionHandling) + 160
objc_exception_throw (in libobjc.A.dylib) + 48
+[NSException raise:format:] (in CoreFoundation) + 205
___forwarding___ (in CoreFoundation) + 1456
_CF_forwarding_prep_0 (in CoreFoundation) + 120
IKLimitIndexSetToCount (in ImageKit) + 51
-[IKImageBrowserView(ImageBrowserImport) startScrollPrefetchTask] (in ImageKit)
+ 157
-[IKTaskManager taskLoop] (in ImageKit) + 2389
__NSThread__start__ (in Foundation) + 1197
_pthread_body (in libsystem_pthread.dylib) + 340
_pthread_body (in libsystem_pthread.dylib) + 0
thread_start (in libsystem_pthread.dylib) + 13
There's really nothing special in the implementation. IKImageBrowserDataSource
mrotocol methods looks something like:
- (NSUInteger)numberOfItemsInImageBrowser:(IKImageBrowserView *)aBrowser
{
return [myItems count];
}
- (id)imageBrowser:(IKImageBrowserView *)aBrowser
itemAtIndex:(NSUInteger)anIndex
{
return myItems[anIndex];
}
and items implement IKImageBrowserItem also in a very simple way:
- (NSString *)imageUID
{
return [self bundleIdentifier];
}
- (NSString *)imageRepresentationType
{
return IKImageBrowserNSImageRepresentationType;
}
- (id)imageRepresentation
{
return [self image];
}
- (NSString *)imageTitle
{
return [self displayName];
}
- (BOOL)isSelectable
{
return YES;
}
- (NSImage *)image
{
if (!_image)
{
NSImage *image = [[NSImage alloc] initWithSize:NSMakeSize(128.0,
128.0)];
[image lockFocus];
NSRect imageRect = NSMakeRect(.0, .0, 128.0, 128.0);
[[NSColor redColor] set];
[NSBezierPath fillRect:imageRect];
[[NSColor blackColor] set];
[NSBezierPath strokeRect:imageRect];
[image unlockFocus];
[self setImage:image];
}
return _image;
}
The UI is implemented using xib file, not a storyboard. Even Apple's official
sample code available at
https://developer.apple.com/library/content/samplecode/ImageBrowserViewAppearance/Introduction/Intro.html
suffers from the same issue.
Have anyone find a workaround for this issue. It looks like a bug in the SDK.
Thanks,
-- Dragan
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