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Ios EXC\u调度\u获取\u主队列（）上的错误\u访问

ios objective-c

Ios EXC\u调度\u获取\u主队列（）上的错误\u访问,ios,objective-c,init,dispatch-async,alloc,Ios,Objective C,Init,Dispatch Async,Alloc,我有这段代码，有时变量dConfiguration为Nil，我得到一个EXC_BAD_访问错误，大多数时候变量表示0个键/值对，错误几乎不可能重现，我只需单击我的按钮，大多数时间工作，但在极少数情况下失败 serviceData = data; dispatch_async(dispatch_get_main_queue(), ^{ [loading removeFromSuperview]; _tvTable.hidden = NO; dConfiguration =[

我有这段代码，有时变量dConfiguration为Nil，我得到一个EXC_BAD_访问错误，大多数时候变量表示0个键/值对，错误几乎不可能重现，我只需单击我的按钮，大多数时间工作，但在极少数情况下失败

serviceData = data;
dispatch_async(dispatch_get_main_queue(), ^{
    [loading removeFromSuperview];
    _tvTable.hidden = NO;
    dConfiguration =[NSJSONSerialization JSONObjectWithData:serviceData options:kNilOptions error:nil];
    if (![[dConfiguration objectForKey:@"NumberOfLines"] isEqual: [NSNull null]]) {
        _NumberOfLines = [[dConfiguration objectForKey:@"NumberOfLines"] integerValue];
    } else {
        _NumberOfLines = 1;
    }
    if(badget!=nil){
        dBadgets = [NSJSONSerialization JSONObjectWithData:badget options:kNilOptions error:nil];
    }
    dValue = [dConfiguration objectForKey:sButtonType];
    RowCount = (int)dValue.count;
    [_tvTable numberOfRowsInSection:RowCount];
    [self loadTable];
});
此变量在实现中声明为全局变量：

@implementation vcTableViewEventsManagerEvents {
    NSDictionary *dConfiguration;
}
我从未实现过alloc init代码：

dConfiguration = [[NSDictionary alloc] init];
这可能是问题所在吗？如果我总是初始化变量，这个错误不会发生吗？始终进行初始化是一种良好的做法？我在哪里可以看到EXC\u BAD\u访问的更详细信息

谢谢你的帮助

更新1

我尝试将错误视为所有注释，可能我做错了什么，因为错误变量为nil这是屏幕截图：

在这个特定的时间，变量dConfiguration表示0个键/值对，因为我添加了alloc init

我曾尝试过双击，并尽可能快地从选项卡栏项目中进行更改，有时有效，有时无效

更新2

正如您所问，这是错误的原因：

线程#1:tid=0x7bfdfd，0x2537dd52基础
newJSONString+98，
队列='com.apple.main thread'，停止原因=EXC\u错误访问（代码=1，
地址=0x3fe64a2）
帧#0:0x2537dd52基础
newJSONString+98 框架#1:0x2537d300基础
newJSONValue+1976
帧#2:0x2537cf04基础
newJSONValue+956 帧#3:0x2537d380基础
newJSONValue+2104
框架#4:0x2537ca80基础
-[\u NSJSONReader parseUTF8JSONData:skipBytes:options:+176 帧#5:0x2537c88e基础
-[[u NSJSONReader parseData:options:][238]
帧#6:0x2537c718基础
+[NSJSONSerialization JSONObjectWithData:options:error:+156 框架#7:0x00121b24访客体验
\uuu 43-[vcTableViewEvents管理预览
检查JSON]\u块调用\u 2（.block\u描述符=0x17040f40）+244 at
vcTableViewEventsManagerEvents.m:298
帧#8:0x00495b7e libdispatch.dylib
_dispatch_call_block_和_release+10 第9帧：0x00495b6a libdispatch.dylib
\u dispatch\u client\u callout+22
帧#10:0x0049a654 libdispatch.dylib
_dispatch_main_queue_callback_4CF+1680 帧#11:0x24b81bdc CoreFoundation
\uuu CFRUNLOOP\u正在为\u主\u调度\u队列\uu8提供服务
帧#12:0x24b800d6 CoreFoundation
\uu CFRunLoopRun+1574 帧#13:0x24acf2e8 CoreFoundation
CFRunLoopRunSpecific+520
帧#14:0x24acf0d4 CoreFoundation
CFRunLoopRunInMode+108 帧#15:0x260bfac8图形服务
GSEventRunModal+160
帧#16:0x291940b8 UIKit
UIApplicationMain+144 帧#17:0x001cb6f0访客体验
main（argc=1，argv=0x00473b5c）+106位于main处。m:16
帧#18:0x24777872 libdyld.dylib
start+2

更新3

我在控制台中执行了此命令以查看JSON，在我看来是正确的：

(lldb) po (NSString *)[[NSString alloc] initWithData:serviceData encoding:4]

{
    "BackgroundImage": null,
    "ButtonGallery": null,
    "Buttons": null,
    "ButtonsEvents": [{
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "04 JUN 2016 - Horario: 11.00 - 18.00",
        "Id": 23,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_15f37703-f0a0-4f10-be70-76e0118fa9f9_x320.jpg",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_15f37703-f0a0-4f10-be70-76e0118fa9f9_x320.jpg",
        "ImageRetinaHeighlighted": null,
        "Item": "134",
        "ItemType": null,
        "JsonConfigFile": "134es",
        "Label": "Brazil Pool Party",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Brazil Pool Party",
        "ViewController": 21
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "23 JUN 2016 - Horario: 20:00 - 01:00",
        "Id": 29,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_5af125bb-1bdf-4fcf-9306-3b565cdbb928_x320.jpg",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_5af125bb-1bdf-4fcf-9306-3b565cdbb928_x320.jpg",
        "ImageRetinaHeighlighted": null,
        "Item": "140",
        "ItemType": null,
        "JsonConfigFile": "140es",
        "Label": "Noche de San Juan",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Noche de San Juan",
        "ViewController": 21
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "02 JUL 2016 - Horario: 21:00 - 1:00",
        "Id": 30,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_7227de52-8d27-4a65-bdf7-dea08e37b968_x320.jpg",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_7227de52-8d27-4a65-bdf7-dea08e37b968_x320.jpg",
        "ImageRetinaHeighlighted": null,
        "Item": "141",
        "ItemType": null,
        "JsonConfigFile": "141es",
        "Label": "Noche Amàre",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Noche Amàre",
        "ViewController": 21
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "09 JUL 2016 - Horario: 22:00 - 00:00",
        "Id": 28,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_4ad05ca3-c345-4a6f-aeb9-972610056b86_x320.jpg",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_4ad05ca3-c345-4a6f-aeb9-972610056b86_x320.jpg",
        "ImageRetinaHeighlighted": null,
        "Item": "139",
        "ItemType": null,
        "JsonConfigFile": "139es",
        "Label": "Noche Flamenca Beach",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Noche Flamenca Beach",
        "ViewController": 21
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "20 JUL 2016 - Horario: 19:00 - 22:00",
        "Id": 27,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_161bab39-5ac6-43a0-84c4-5c0fa764b5b0_x320.jpg",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_161bab39-5ac6-43a0-84c4-5c0fa764b5b0_x320.jpg",
        "ImageRetinaHeighlighted": null,
        "Item": "138",
        "ItemType": null,
        "JsonConfigFile": "138es",
        "Label": "Noche de luna llena",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Noche de luna llena",
        "ViewController": 21
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "23 JUL 2016 - Horario: 21:00 - 00:00",
        "Id": 26,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_c657d56d-5f24-4f28-8d0c-66afb2fae1ad_x320.jpg",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_c657d56d-5f24-4f28-8d0c-66afb2fae1ad_x320.jpg",
        "ImageRetinaHeighlighted": null,
        "Item": "137",
        "ItemType": null,
        "JsonConfigFile": "137es",
        "Label": "Noche cubana",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Noche cubana",
        "ViewController": 21
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "06 AGO 2016 - Horario: 22:00 - 00:00",
        "Id": 31,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_98032ab6-b689-42d6-b19b-6b82705478a3_x320.jpg",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_98032ab6-b689-42d6-b19b-6b82705478a3_x320.jpg",
        "ImageRetinaHeighlighted": null,
        "Item": "142",
        "ItemType": null,
        "JsonConfigFile": "142es",
        "Label": "Noche Flamenca Beach",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Noche Flamenca Beach",
        "ViewController": 21
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "13 AGO 2016 - Horario: 21:00 - 00:00",
        "Id": 32,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_447f28d9-ed38-4482-868e-74743cbb5a89_x320.jpg",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_447f28d9-ed38-4482-868e-74743cbb5a89_x320.jpg",
        "ImageRetinaHeighlighted": null,
        "Item": "143",
        "ItemType": null,
        "JsonConfigFile": "143es",
        "Label": "Noche cubana",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Noche cubana",
        "ViewController": 21
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "10 SEP 2016 - Horario: 11:00 - 18:00",
        "Id": 33,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_a7328a94-d64d-4fd4-b0a1-a2c126c8c92c_x320.jpg",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_a7328a94-d64d-4fd4-b0a1-a2c126c8c92c_x320.jpg",
        "ImageRetinaHeighlighted": null,
        "Item": "144",
        "ItemType": null,
        "JsonConfigFile": "144es",
        "Label": "Pool Party",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Pool Party",
        "ViewController": 21
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "17 SEP 2016 - Horario: 12:00 - 18:00",
        "Id": 25,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_9f8af8e5-56d7-433f-9661-9403196faad8_x320.jpg",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_9f8af8e5-56d7-433f-9661-9403196faad8_x320.jpg",
        "ImageRetinaHeighlighted": null,
        "Item": "136",
        "ItemType": null,
        "JsonConfigFile": "136es",
        "Label": "Oktoberfest",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Oktoberfest",
        "ViewController": 21
    }],
    "ButtonsPromotions": [{
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "",
        "Id": 18,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_ba95942c-1ece-4332-9f95-eb3f95738f41_x320.png",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_ba95942c-1ece-4332-9f95-eb3f95738f41_x320.png",
        "ImageRetinaHeighlighted": null,
        "Item": "126",
        "ItemType": null,
        "JsonConfigFile": "126es",
        "Label": "Desayuna con Nosotros",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Desayuna con Nosotros",
        "ViewController": 20
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "",
        "Id": 19,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_3b9f1e44-5f33-4eb9-987b-5e50dcaed2a7_x320.png",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_3b9f1e44-5f33-4eb9-987b-5e50dcaed2a7_x320.png",
        "ImageRetinaHeighlighted": null,
        "Item": "127",
        "ItemType": null,
        "JsonConfigFile": "127es",
        "Label": "Disfruta de Nuestra Cena Buffet",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Disfruta de Nuestra Cena Buffet",
        "ViewController": 20
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "",
        "Id": 20,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_f0ec90c9-3383-48f7-b5cf-28a236aee9e9_x320.png",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_f0ec90c9-3383-48f7-b5cf-28a236aee9e9_x320.png",
        "ImageRetinaHeighlighted": null,
        "Item": "128",
        "ItemType": null,
        "JsonConfigFile": "128es",
        "Label": "Alquiler de Bicicletas Vintage",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Alquiler de Bicicletas Vintage",
        "ViewController": 20
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "",
        "Id": 21,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_f72a03bf-ddd2-486e-a289-cb3e82bd08db_x320.png",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_f72a03bf-ddd2-486e-a289-cb3e82bd08db_x320.png",
        "ImageRetinaHeighlighted": null,
        "Item": "129",
        "ItemType": null,
        "JsonConfigFile": "129es",
        "Label": "Parking",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Parking",
        "ViewController": 20
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "",
        "Id": 22,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_3dd87e35-2ae3-4ef2-a70a-f1b44e41d27a_x320.png",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_3dd87e35-2ae3-4ef2-a70a-f1b44e41d27a_x320.png",
        "ImageRetinaHeighlighted": null,
        "Item": "130",
        "ItemType": null,
        "JsonConfigFile": "130es",
        "Label": "Ofertas de Grab & Go",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Ofertas de Grab & Go",
        "ViewController": 20
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "",
        "Id": 13,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_b8187a48-1b03-4b29-a403-f03af8433c4f_x320.png",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_b8187a48-1b03-4b29-a403-f03af8433c4f_x320.png",
        "ImageRetinaHeighlighted": null,
        "Item": "92",
        "ItemType": null,
        "JsonConfigFile": "92es",
        "Label": "Habitación \"The One\"",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Habitación \"The One\"",
        "ViewController": 20
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "",
        "Id": 14,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_fc20ec9b-2107-4828-9796-d5234dbe80fd_x320.png",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_fc20ec9b-2107-4828-9796-d5234dbe80fd_x320.png",
        "ImageRetinaHeighlighted": null,
        "Item": "98",
        "ItemType": null,
        "JsonConfigFile": "98es",
        "Label": "Disfruta de una Salida de Habitación más Tarde",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Disfruta de una Salida de Habitación más Tarde",
        "ViewController": 20
    }, {
        "BadgeCount": 0,
        "ClientId": 0,
        "Frequency": "",
        "Id": 15,
        "Image": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_be514668-27d0-4ee8-995e-0f8f89936c9b_x320.png",
        "ImageHeighlighted": null,
        "ImageIconTitle": "",
        "ImageRetina": "http:\/\/ServerCloud.CloudApp.net\/DesktopServerCloud\/ClientData\/4\/Images\/GVT_be514668-27d0-4ee8-995e-0f8f89936c9b_x320.png",
        "ImageRetinaHeighlighted": null,
        "Item": "103",
        "ItemType": null,
        "JsonConfigFile": "103es",
        "Label": "Habitación categoría superior",
        "LongTitle": null,
        "Selector": "btnAction:",
        "SubLabel": null,
        "Title": "Habitación categoría superior",
        "ViewController": 20
    }],
    "ButtonsTabList": null,
    "DatePeriod": null,
    "Details": null,
    "Disclaimer": null,
    "MessageList": null,
    "NoBooking": null,
    "NumberOfLines": 2,
    "Pins": null,
    "Selector": null,
    "ServiceType": null,
    "TabList": null,
    "Texts": null,
    "Titles": null,
    "Url": null,
    "UserCode": null
}
修改块内的变量时，必须使用
\u块
说明符

__block NSDictionary *dConfiguration;


__block NSData *serviceData = data;
dispatch_async(dispatch_get_main_queue(), ^{
  //...
});
您不需要alloc/init，因为您需要[NSJSONSerialization stuff]并为其分配返回值。但是当它发生时，
serviceData
nil？另外，能否在
JSONObjectWithData:options:error:
中添加
NSError
参数？如果您在按钮上快速单击两次，是否会发生错误？请尝试在旁边的直线处传递错误变量：任何向SO发布有关崩溃或错误的消息，并且有一个方法调用，其中
nil
被传递到
NSError**
参数，则应立即删除其SO发布权限。这是调试的绝对基本级别。（事实上，这对这次崩溃没有帮助，但是，在达到这一点之前，应该付出更多的努力。）@Larme serviceData不是零，它有正确的JSON数据，当我快速更改选项卡中的部分时，会发生错误，我将尝试传递错误变量并发布results@AvinashSharma我将尝试传递错误变量并发布结果我可以在全局变量中使用_块说明符吗？或者我应该制作一个副本并使用它吗？谢谢你的帮助，但是_块说明符不起作用。最后，我简化了代码，但是直到，它更难复制，但它仍然在发生，因此，我添加了_块说明符，从昨天起，我无法再现错误，因此我将把这个答案设置为正确答案。嗨@Marcantoniouzcateguipescoz，很抱歉答案延迟。我很高兴我的回答让你找到了解决办法。祝你有美好的一天