I have an app that displays a UIImage in a UIImageView in a UIScrollView in a UITableViewCell. I update the image using Quartz to draw a line, a circle or square and some text.
What I'm experiencing is very random crashes on the device that according to the crash log occurs in QuartzCore. I can't reproduce the crashes on the simulator.
I've checked a lot of examples and I think I am doing this correctly (but probably not or I wouldn't have the crashes).
The drawing occurs in the main thread. I create the CG Context with:
Then I finish up with
Here's the crash log
What I'm experiencing is very random crashes on the device that according to the crash log occurs in QuartzCore. I can't reproduce the crashes on the simulator.
I've checked a lot of examples and I think I am doing this correctly (but probably not or I wouldn't have the crashes).
The drawing occurs in the main thread. I create the CG Context with:
Code:
UIGraphicsBeginImageContext(myImageView.frame.size);
CGContextRef context = UIGraphicsGetCurrentContext();
// draw a circle
CGContextSetRGBStrokeColor(context, 0.0, 0.0, 0.0, 1.0);
CGContextSetRGBFillColor(context, 0.0, 0.0, 0.0, 1.0);
CGContextFillEllipseInRect(context, CGRectMake(col1-wAdj, row1-hAdj, kTinyPointDotSize, kTinyPointDotSize));
// drawing a label
CGContextSetRGBStrokeColor(context, red, green, blue, 1.0);
CGContextSetRGBFillColor(context, red, green, blue, 1.0);
CGContextSetLineWidth(context, 1.0);
[commonName drawAtPoint:CGPointMake(lblCol, lblRow) withFont:[UIFont fontWithName:@"Helvetica-Bold" size:12.0]];
CGPoint s = CGPointMake(col1, row1);
CGPoint e = CGPointMake(lblCol+lblColAdj, lblRow+10);
CGContextMoveToPoint(context, s.x, s.y);
CGContextAddLineToPoint(context, e.x, e.y);
CGContextStrokePath(context);Then I finish up with
Code:
myImageView.image = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();Here's the crash log
Code:
Incident Identifier: 67518862-9F63-4813-829C-A22D8F4305FC
CrashReporter Key: c9c3f3ea41d4ce68c2386f5d6a8826a09205fc70
Process: TcmAid [176]
Path: /var/mobile/Applications/5164034F-14F1-416C-AD6A-862EF7FD085E/TcmAid.app/TcmAid
Identifier: TcmAid
Version: ??? (???)
Code Type: ARM (Native)
Parent Process: launchd [1]
Date/Time: 2009-12-24 08:58:46.773 -0800
OS Version: iPhone OS 3.1.2 (7D11)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGBUS)
Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000a
Crashed Thread: 0
Thread 0 Crashed:
0 libobjc.A.dylib 0x00003ebc objc_msgSend + 20
1 CoreFoundation 0x00059e82 CFGetRetainCount + 118
2 QuartzCore 0x0000b700 CA::release_root_if_unused(_CALayer*, _CALayer*, void*) + 8
3 QuartzCore 0x0000b670 x_hash_table_remove_if + 76
4 QuartzCore 0x0000b410 CA::Transaction::commit() + 184
5 QuartzCore 0x000135d4 CA::Transaction::observer_callback(__CFRunLoopObserver*, unsigned long, void*) + 84
6 CoreFoundation 0x0000f82a __CFRunLoopDoObservers + 466
7 CoreFoundation 0x00057340 CFRunLoopRunSpecific + 1812
8 CoreFoundation 0x00056c18 CFRunLoopRunInMode + 44
9 GraphicsServices 0x0000436c GSEventRunModal + 188
10 UIKit 0x00003c28 -[UIApplication _run] + 552
11 UIKit 0x00002228 UIApplicationMain + 960
12 TcmAid 0x00002c3a main (main.m:24)
13 TcmAid 0x00002bac start + 44
Thread 1:
0 libSystem.B.dylib 0x000014b8 mach_msg_trap + 20
1 libSystem.B.dylib 0x00004094 mach_msg + 60
2 CoreFoundation 0x00057002 CFRunLoopRunSpecific + 982
3 CoreFoundation 0x00056c18 CFRunLoopRunInMode + 44
4 WebCore 0x000846f0 RunWebThread(void*) + 412
5 libSystem.B.dylib 0x0002b7b0 _pthread_body + 20
Thread 2:
0 libSystem.B.dylib 0x000014b8 mach_msg_trap + 20
1 libSystem.B.dylib 0x00004094 mach_msg + 60
2 CoreFoundation 0x00057002 CFRunLoopRunSpecific + 982
3 CoreFoundation 0x00056c18 CFRunLoopRunInMode + 44
4 Foundation 0x0005a998 +[NSURLConnection(NSURLConnectionReallyInternal) _resourceLoadLoop:] + 172
5 Foundation 0x00053ac6 -[NSThread main] + 42
6 Foundation 0x00001d0e __NSThread__main__ + 852
7 libSystem.B.dylib 0x0002b7b0 _pthread_body + 20
Thread 0 crashed with ARM Thread State:
r0: 0x003ab080 r1: 0x31973544 r2: 0x00818a00 r3: 0x32668ea8
r4: 0x00000002 r5: 0x384201b0 r6: 0x002f1ca0 r7: 0x2ffff1d4
r8: 0x00818a00 r9: 0x000eb195 r10: 0x33e866f8 r11: 0x0000000d
ip: 0x385b72b8 sp: 0x2ffff1bc lr: 0x32da6e89 pc: 0x32668ebc
cpsr: 0x000f0010
Binary Images:
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0x26e000 - 0x26ffff +libremoteoainject.dylib armv6 <8dd8b62ea097c801af829010772f9658> /Developer/Library/PrivateFrameworks/DTInstrumentsServer.framework/libremoteoainject.dylib
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