I’ve been prototyping an internal tool that receives and displays lots of text data. I wanted to display this kind of like how Terminal.app continuously appends text and keeps scrolling to the bottom as more data is added.
I used a stock NSTextView and keep appending to the backing NSTextStorage. I found a solution to autoscrolling on stackoverflow which I incorporated. http://stackoverflow.com/questions/15546808/scrolling-nstextview-to-bottom - (void) postLogEvent:(NSString*)log_message { BOOL scroll = (NSMaxY([[self logStreamTextView] visibleRect]) == NSMaxY([[self logStreamTextView] bounds])); [[[[self logStreamTextView] textStorage] mutableString] appendString:log_message]; if (scroll) // Scroll to end of the textview contents { [[self logStreamTextView] scrollRangeToVisible: NSMakeRange([[[self logStreamTextView] string] length], 0)]; } } This works, but I encountered two problems when the data set gets large. 1) Somewhere after 40,000 lines of text, the application starts becoming unresponsive. Around 50k-60k, the application feels hung and I have to force kill it. I figured out that the bottleneck was in scrollRangeToVisible call. I’ve posted 3 screenshots from Instruments here: https://picasaweb.google.com/ewmailing/AutoscrollingNSTextViewTrace#5962576581630914370 2) If I disable autoscrolling, performance is fine. I got to around 150,000 lines without any problems. But at some point later (my test runs for several hours so I usually leave it unattended and it can generate a million lines, so I don’t know exactly when), Cocoa raised an exception at: -[NSBigMutableString replaceCharactersInRange:withString:]: nil argument (Full exception trace is below for interest.) So I was wondering if there were any better techniques to avoid my two problems or how I should go about resolving them. Since this is an internal tool to help something else, I'm looking for simple/quick solutions, though for my own curiosity, I also do wonder what the proper solution is. Thanks, Eric An uncaught exception was raised 2013-12-28 07:41:50.304 Test262LogClient[44722:303] *** -[NSBigMutableString replaceCharactersInRange:withString:]: nil argument 2013-12-28 07:41:50.305 Test262LogClient[44722:303] ( 0 CoreFoundation 0x00007fff92d6e41c __exceptionPreprocess + 172 1 libobjc.A.dylib 0x00007fff8b7ebe75 objc_exception_throw + 43 2 CoreFoundation 0x00007fff92d6e2cc +[NSException raise:format:] + 204 3 Foundation 0x00007fff928430e4 -[NSBigMutableString replaceCharactersInRange:withString:] + 111 4 Foundation 0x00007fff9284185e -[NSConcreteMutableAttributedString replaceCharactersInRange:withString:] + 295 5 AppKit 0x00007fff893ff136 -[NSConcreteTextStorage replaceCharactersInRange:withString:] + 77 6 Test262LogClient 0x00000001000020bf -[LogStreamWindowController postLogEvent:] + 591 7 Test262LogClient 0x0000000100010533 __69-[ResolveForLogStreamDelegate connectToServerAndSendStreamDirective:]_block_invoke_256 + 67 8 libdispatch.dylib 0x00007fff8c3e11d7 _dispatch_call_block_and_release + 12 9 libdispatch.dylib 0x00007fff8c3de2ad _dispatch_client_callout + 8 10 libdispatch.dylib 0x00007fff8c3e5f03 _dispatch_main_queue_callback_4CF + 333 11 CoreFoundation 0x00007fff92cd5839 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9 12 CoreFoundation 0x00007fff92c90b14 __CFRunLoopRun + 1636 13 CoreFoundation 0x00007fff92c90275 CFRunLoopRunSpecific + 309 14 HIToolbox 0x00007fff8b9baf0d RunCurrentEventLoopInMode + 226 15 HIToolbox 0x00007fff8b9bacb7 ReceiveNextEventCommon + 479 16 HIToolbox 0x00007fff8b9baabc _BlockUntilNextEventMatchingListInModeWithFilter + 65 17 AppKit 0x00007fff891a228e _DPSNextEvent + 1434 18 AppKit 0x00007fff891a18db -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122 19 AppKit 0x00007fff891959cc -[NSApplication run] + 553 20 AppKit 0x00007fff89180803 NSApplicationMain + 940 21 Test262LogClient 0x000000010005f962 main + 34 22 libdyld.dylib 0x00007fff8d6245fd start + 1 23 ??? 0x0000000000000003 0x0 + 3 ) 2013-12-28 07:41:50.307 Test262LogClient[44722:303] *** Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '*** -[NSBigMutableString replaceCharactersInRange:withString:]: nil argument' *** First throw call stack: ( 0 CoreFoundation 0x00007fff92d6e41c __exceptionPreprocess + 172 1 libobjc.A.dylib 0x00007fff8b7ebe75 objc_exception_throw + 43 2 CoreFoundation 0x00007fff92d6e2cc +[NSException raise:format:] + 204 3 Foundation 0x00007fff928430e4 -[NSBigMutableString replaceCharactersInRange:withString:] + 111 4 Foundation 0x00007fff9284185e -[NSConcreteMutableAttributedString replaceCharactersInRange:withString:] + 295 5 AppKit 0x00007fff893ff136 -[NSConcreteTextStorage replaceCharactersInRange:withString:] + 77 6 Test262LogClient 0x00000001000020bf -[LogStreamWindowController postLogEvent:] + 591 7 Test262LogClient 0x0000000100010533 __69-[ResolveForLogStreamDelegate connectToServerAndSendStreamDirective:]_block_invoke_256 + 67 8 libdispatch.dylib 0x00007fff8c3e11d7 _dispatch_call_block_and_release + 12 9 libdispatch.dylib 0x00007fff8c3de2ad _dispatch_client_callout + 8 10 libdispatch.dylib 0x00007fff8c3e5f03 _dispatch_main_queue_callback_4CF + 333 11 CoreFoundation 0x00007fff92cd5839 __CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 9 12 CoreFoundation 0x00007fff92c90b14 __CFRunLoopRun + 1636 13 CoreFoundation 0x00007fff92c90275 CFRunLoopRunSpecific + 309 14 HIToolbox 0x00007fff8b9baf0d RunCurrentEventLoopInMode + 226 15 HIToolbox 0x00007fff8b9bacb7 ReceiveNextEventCommon + 479 16 HIToolbox 0x00007fff8b9baabc _BlockUntilNextEventMatchingListInModeWithFilter + 65 17 AppKit 0x00007fff891a228e _DPSNextEvent + 1434 18 AppKit 0x00007fff891a18db -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 122 19 AppKit 0x00007fff891959cc -[NSApplication run] + 553 20 AppKit 0x00007fff89180803 NSApplicationMain + 940 21 Test262LogClient 0x000000010005f962 main + 34 22 libdyld.dylib 0x00007fff8d6245fd start + 1 23 ??? 0x0000000000000003 0x0 + 3 ) libc++abi.dylib: terminating with uncaught exception of type NSException (lldb) _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. 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