objective-c - iOS 应用仅在不调试时崩溃

Question

我正在使用 testflight 测试我的应用程序，但只有当应用程序是为临时构建并通过测试飞行分发时才会发生崩溃。相关的崩溃报告详细信息是:

Date/Time:       2012-06-11 09:00:34.638 +0800
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                 0x34e74f78 objc_msgSend + 16
1   appName                         0x0002963e __24-[XYPieChart reloadData]_block_invoke_0168 (XYPieChart.m:321)
2   libdispatch.dylib               0x30295c52 _dispatch_call_block_and_release + 6
3   libdispatch.dylib               0x302a0e8a _dispatch_main_queue_callback_4CF$VARIANT$up + 190
4   CoreFoundation                  0x371482a6 __CFRunLoopRun + 1262
5   CoreFoundation                  0x370cb49e CFRunLoopRunSpecific + 294
6   CoreFoundation                  0x370cb366 CFRunLoopRunInMode + 98
7   GraphicsServices                0x3388a432 GSEventRunModal + 130
8   UIKit                           0x30e77cce UIApplicationMain + 1074
9   appName                         0x00003b20 main (main.m:14)
10  appName                         0x00003ad8 0x1000 + 10968

以及引用的代码-(XYPieChart.m:321)

    [CATransaction begin];
    [CATransaction setAnimationDuration:_animationSpeed];

    [_pieView setUserInteractionEnabled:NO];

    __block NSMutableArray *layersToRemove = nil;
    [CATransaction setCompletionBlock:^{

        if (layersToRemove) {
            [layersToRemove enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
                if (obj)
                    [obj removeFromSuperlayer];
            }];

            [layersToRemove removeAllObjects];
        }

        for(SliceLayer *layer in _pieView.layer.sublayers)
        {
            [layer setZPosition:kDefaultSliceZOrder];
        }

        [_pieView setUserInteractionEnabled:YES];
    }];

    BOOL isOnStart = ([slicelayers count] == 0 && sliceCount);
    NSInteger diff = sliceCount - [slicelayers count];
    layersToRemove = [NSMutableArray arrayWithArray:slicelayers];

    BOOL isOnEnd = ([slicelayers count] && (sliceCount == 0 || sum <= 0));
    if(isOnEnd)
    {
        for(SliceLayer *layer in _pieView.layer.sublayers){
            [self updateLabelForLayer:layer value:0];
            [layer createArcAnimationForKey:@"startAngle"
                                  fromValue:[NSNumber numberWithDouble:_startPieAngle]
                                    toValue:[NSNumber numberWithDouble:_startPieAngle] 
                                   Delegate:self];
            [layer createArcAnimationForKey:@"endAngle" 
                                  fromValue:[NSNumber numberWithDouble:_startPieAngle]
                                    toValue:[NSNumber numberWithDouble:_startPieAngle] 
                                   Delegate:self];
        }
        [CATransaction commit];
        return;
    }

如果我可以在调试时重现问题，我就能找到问题所在，但它似乎只在为临时构建时才会出现。谢谢!

编辑: 使用模拟器，我已将问题追踪到此行的 EXC_BAD_ACCESS

[layersToRemove enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {

Answer 1

我遇到了类似的问题并尝试更改项目build设置，但它对我不起作用。最终通过更改版本的编译器优化级别设置解决了我的问题:

在build设置中，转到 LLVM 编译器 4.2 - 代码生成部分，查找优化级别选项并将发布设置从最快、最小 [-Os] 更改为无 [-O0]。

希望这对您有所帮助!