EXC_BAD_ACCESS与ARC

-2

我正在使用ARC，我有一个CustomTableViewController，并且将CustomView添加到我的背景单元格，页眉和页脚。EXC_BAD_ACCESS与ARC

例如在tableView:viewForFooterInSection方法我把这些代码行：

- (UIView *) tableView:(UITableView *)tableView viewForFooterInSection:(NSInteger)section 
{ 
    CustomFooter *footer = [[CustomFooter alloc] init]; 
    return footer; 
}

CustomFooter是的UIView的子类，绘制一个矩形作为背景细胞与- (void)drawRect:(CGRect)rect

当我运行在应用程序模拟器的作品，但它试图在我的iPhone上时崩溃。

我该如何解决？

这是我的崩溃报告：

Date/Time:  2012-06-28 12:37:07.168 +0200 
OS Version:  iPhone OS 5.1.1 (9B206) 
Report Version: 104 

Exception Type: EXC_BAD_ACCESS (SIGSEGV) 
Exception Codes: KERN_INVALID_ADDRESS at 0x00000009 
Crashed Thread: 0 

Thread 0 name: Dispatch queue: com.apple.main-thread 
Thread 0 Crashed: 
0 libobjc.A.dylib     0x3508cf78 objc_msgSend + 16 
1 CoreFoundation     0x372d5e90 CFRetain + 76 
2 CoreFoundation     0x372dfb74 +[__NSArrayI __new::] + 48 
3 CoreFoundation     0x372dfa8e -[__NSPlaceholderArray initWithObjects:count:] + 294 
4 CoreFoundation     0x3730ce68 +[NSArray arrayWithObjects:] + 460 
5 CustomTable      0x0004766e drawLinearGradient (Common.m:15) 
6 CustomTable      0x00048c14 -[CustomFooter drawRect:] (CustomFooter.m:50) 
7 UIKit       0x3107015e -[UIView(CALayerDelegate) drawLayer:inContext:] + 270 
8 QuartzCore      0x374b74de -[CALayer drawInContext:] + 110 
9 QuartzCore      0x374b6b38 CABackingStoreUpdate_ + 1776 
10 QuartzCore      0x374b632e CA::Layer::display_() + 950 
11 QuartzCore      0x374b5f5a CA::Layer::display() + 122 
12 QuartzCore      0x374b5e9c CA::Layer::display_if_needed(CA::Transaction*) + 168 
13 QuartzCore      0x374b5844 CA::Context::commit_transaction(CA::Transaction*) + 228 
14 QuartzCore      0x374b5578 CA::Transaction::commit() + 308 
15 QuartzCore      0x374dd90a CA::Transaction::flush() + 38 
16 QuartzCore      0x374dd8dc +[CATransaction flush] + 28 
17 UIKit       0x310a6108 -[UIApplication _reportAppLaunchFinished] + 36 
18 UIKit       0x31093b2c -[UIApplication _runWithURL:payload:launchOrientation:statusBarStyle:statusBarHidden:] + 1256 
19 UIKit       0x31061abc -[UIApplication handleEvent:withNewEvent:] + 1004 
20 UIKit       0x31061560 -[UIApplication sendEvent:] + 48 
21 UIKit       0x31060f34 _UIApplicationHandleEvent + 5820 
22 GraphicsServices    0x33aa3224 PurpleEventCallback + 876 
23 CoreFoundation     0x3736151c __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 32 
24 CoreFoundation     0x373614be __CFRunLoopDoSource1 + 134 
25 CoreFoundation     0x3736030c __CFRunLoopRun + 1364 
26 CoreFoundation     0x372e349e CFRunLoopRunSpecific + 294 
27 CoreFoundation     0x372e3366 CFRunLoopRunInMode + 98 
28 UIKit       0x31092864 -[UIApplication _run] + 544 
29 UIKit       0x3108fcce UIApplicationMain + 1074 
30 CustomTable      0x00046798 main (main.m:16) 
31 CustomTable      0x0004673c start + 32 

Thread 1 name: Dispatch queue: com.apple.libdispatch-manager 
Thread 1: 
0 libsystem_kernel.dylib   0x315343a8 kevent + 24 
1 libdispatch.dylib    0x304b9ea4 _dispatch_mgr_invoke + 708 
2 libdispatch.dylib    0x304b9bc2 _dispatch_mgr_thread + 30 

Thread 2: 
0 libsystem_kernel.dylib   0x31544cd4 __workq_kernreturn + 8 
1 libsystem_c.dylib    0x33bfcf36 _pthread_wqthread + 610 
2 libsystem_c.dylib    0x33bfccc8 start_wqthread + 0 

Thread 3: 
0 libsystem_kernel.dylib   0x31544cd4 __workq_kernreturn + 8 
1 libsystem_c.dylib    0x33bfcf36 _pthread_wqthread + 610 
2 libsystem_c.dylib    0x33bfccc8 start_wqthread + 0 

Thread 4 name: WebThread 
Thread 4: 
0 libsystem_kernel.dylib   0x31534004 mach_msg_trap + 20 
1 libsystem_kernel.dylib   0x315341fa mach_msg + 50 
2 CoreFoundation     0x373613ec __CFRunLoopServiceMachPort + 120 
3 CoreFoundation     0x37360124 __CFRunLoopRun + 876 
4 CoreFoundation     0x372e349e CFRunLoopRunSpecific + 294 
5 CoreFoundation     0x372e3366 CFRunLoopRunInMode + 98 
6 WebCore       0x32c8cc9c _ZL12RunWebThreadPv + 396 
7 libsystem_c.dylib    0x33c0272e _pthread_start + 314 
8 libsystem_c.dylib    0x33c025e8 thread_start + 0 

Thread 0 crashed with ARM Thread State: 
r0: 0x00125860 r1: 0x30d16b7c  r2: 0x3f9a3570  r3: 0x0014b170 
r4: 0x00000001 r5: 0x2fe41188  r6: 0x0014b178  r7: 0x2fe4114c 
r8: 0x0014b170 r9: 0x0c345adf  r10: 0x00000002  r11: 0x00000001 
ip: 0x3f97f814 sp: 0x2fe41140  lr: 0x372d5e97  pc: 0x3508cf78 
cpsr: 0x00000030

这是我的drawRect功能分为CustomFooter：

- (void)drawRect:(CGRect)rect 
{ 

CGContextRef context = UIGraphicsGetCurrentContext(); 

CGColorRef whiteColor = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0].CGColor; 
CGColorRef lightGrayColor = [UIColor colorWithRed:230.0/255.0 green:230.0/255.0 blue:230.0/255.0 alpha:1.0].CGColor; 
CGColorRef darkGrayColor = [UIColor colorWithRed:187.0/255.0 green:187.0/255.0 blue:187.0/255.0 alpha:1.0].CGColor; 
CGColorRef shadowColor = [UIColor colorWithRed:0.2 green:0.2 blue:0.2 alpha:0.5].CGColor; 

CGFloat paperMargin = 9.0; 
CGRect paperRect = CGRectMake(self.bounds.origin.x+paperMargin, 
           self.bounds.origin.y, 
           self.bounds.size.width-paperMargin*2, 
           self.bounds.size.height); 

CGRect arcRect = paperRect; 
arcRect.size.height = 8; 

CGContextSaveGState(context); 
CGMutablePathRef arcPath = createArcPathFromBottomOfRect(arcRect, 4.0); 
CGContextAddPath(context, arcPath); 
CGContextClip(context);    
drawLinearGradient(context, paperRect, lightGrayColor, darkGrayColor); 
CGContextRestoreGState(context); 

CGContextSaveGState(context); 
CGPoint pointA = CGPointMake(arcRect.origin.x, 
          arcRect.origin.y + arcRect.size.height - 1); 
CGPoint pointB = CGPointMake(arcRect.origin.x, arcRect.origin.y); 
CGPoint pointC = CGPointMake(arcRect.origin.x + arcRect.size.width - 1, 
          arcRect.origin.y); 
CGPoint pointD = CGPointMake(arcRect.origin.x + arcRect.size.width - 1, 
          arcRect.origin.y + arcRect.size.height - 1); 
draw1PxStroke(context, pointA, pointB, whiteColor); 
draw1PxStroke(context, pointC, pointD, whiteColor);  
CGContextRestoreGState(context); 

CGContextAddRect(context, paperRect); 
CGContextAddPath(context, arcPath); 
CGContextEOClip(context); 
CGContextAddPath(context, arcPath); 
CGContextSetShadowWithColor(context, CGSizeMake(0, 2), 3.0, shadowColor); 
CGContextFillPath(context); 

CFRelease(arcPath); 
}

drawLinearGradient

void drawLinearGradient(CGContextRef context, CGRect rect, CGColorRef startColor, CGColorRef endColor) 
{ 
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB(); 
CGFloat locations[] = { 0.0, 1.0 }; 
NSArray *colors = [NSArray arrayWithObjects:(__bridge id)startColor, (__bridge id)endColor, nil]; 
CGGradientRef gradient = CGGradientCreateWithColors(colorSpace, (__bridge CFArrayRef) colors, locations); 

CGPoint startPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMinY(rect)); 
CGPoint endPoint = CGPointMake(CGRectGetMidX(rect), CGRectGetMaxY(rect)); 

CGContextSaveGState(context); 
CGContextAddRect(context, rect); 
CGContextClip(context); 
CGContextDrawLinearGradient(context, gradient, startPoint, endPoint, 0); 
CGContextRestoreGState(context); 

CGGradientRelease(gradient); 
CGColorSpaceRelease(colorSpace); 

}

来源

2012-06-28 andreapavan

我们展示崩溃日志/堆栈跟踪。 – Till

对不起，我现在发布 – andreapavan

这个问题似乎出现在你的'drawRect'方法中。请发布该方法的代码。 –

JeremyP对阵列初始化器崩溃的分析是正确的。我猜的根本原因是：

CGColorRef whiteColor = [UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:1.0].CGColor;

我的猜测是因为你不使用你UIColor创造超越这一说法，将热切ARC释放。这也意味着你没有以任何方式保留的CGColor（以及哪些ARC不会保留给你）可能也会被释放和处理。

尝试用这样的事情每个UIColors（和白茫茫的一片，只使用[UIColor whiteColor]）的工作围绕它：

UIColor *color = [UIColor ...]; 
CGColorRef cgColor = CFRetain(color.CGColor); 
color = nil;

来源

2012-06-28 13:23:07 Jesper

解决！这正是颜色传递给drawLineGradient方法的过程。我通过传递一个UIColor方法解决了这个问题，并转换为CGColor。 'NSArray * colors = [NSArray arrayWithObjects：（id）[startColor CGColor]，（id）[endColor CGColor]，nil];' – andreapavan

更简单的解决方法是存储并传递UIColor，然后使用myColor.CGColor需要的时候。 – kritzikratzi

有没有足够的背景这里来诊断问题与任何确定性，但我目前的猜测是你的功能drawLinearRect() crea使用arrayWithObjects:测试NSArray，并且参数列表中的一个对象是垃圾。确保列表没有终止，并且其中的所有对象都是合理的。

来源

2012-06-28 12:22:50 JeremyP

是的，你是对的！问题出在包含渐变颜色的数组中。但是这怎么发生？我发布'drawLineGradient' – andreapavan

EXC_BAD_ACCESS与ARC

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