dispatch_get_main_queue（）上的EXC_BAD_ACCESS
我有这个代码，有时变量dConfiguration是Nil而且我得到一个EXC_BAD_ACCESS错误，并且大多数时候变量表示0个键/值对，并且错误几乎不可能重现，我只需单击我的按钮并且大部分时间都在工作，但在极少数情况下会失败。
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：
@implementation vcTableViewEventsManagerEvents {
NSDictionary *dConfiguration;
}
我从未实现过alloc init代码：
dConfiguration = [[NSDictionary alloc] init];
这可能是问题吗？如果我总是初始化变量，这个错误不会发生？始终进行初始化是一个好习惯吗？我在哪里可以看到有关EXC_BAD_ACCESS的详细信息？
感谢您的帮助。
更新1
我已经尝试过看到所有评论的错误，也许我做错了，因为错误变量是nil这是屏幕拍摄：
在这个特定时间，变量dConfiguration表示0个键/值对，因为我添加了alloc init。
我尝试过双击并尽快更改tabbar项目，有时会工作，有时则不会。
更新2
正如你所说，这是错误的BT：
线程＃1：tid = 0x7bfdfd，0x2537dd52基金会
newJSONString + 98, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=1, address=0x3fe64a2) frame #0: 0x2537dd52 FoundationnewJSONString + 98 帧＃1：0x2537d300基金会newJSONValue + 1976 frame #2: 0x2537cf04 FoundationnewJSONValue + 956 第3帧：0x2537d380基金会newJSONValue + 2104 frame #4: 0x2537ca80 Foundation- [_ NSJSONReader parseUTF8JSONData：skipBytes：options：] + 176 帧＃5：0x2537c88e基础-[_NSJSONReader parseData:options:] + 238 frame #6: 0x2537c718 Foundation+ [NSJSONSerialization JSONObjectWithData：options：error：] + 156 帧＃7：0x00121b24 guestperience__43-[vcTableViewEventsManagerEvents checkJson]_block_invoke_2(.block_descriptor=0x17040f40) + 244 at vcTableViewEventsManagerEvents.m:298 frame #8: 0x00495b7e libdispatch.dylib_ dispatch_call_block_and_release + 10 帧＃9：0x00495b6a libdispatch.dylib_dispatch_client_callout + 22 frame #10: 0x0049a654 libdispatch.dylib_ dispatch_main_queue_callback_4CF + 1680 帧＃11：0x24b81bdc CoreFoundation__CFRUNLOOP_IS_SERVICING_THE_MAIN_DISPATCH_QUEUE__ + 8 frame #12: 0x24b800d6 CoreFoundation__ CFRunLoopRun + 1574 帧＃13：0x24acf2e8 CoreFoundationCFRunLoopRunSpecific + 520 frame #14: 0x24acf0d4 CoreFoundationCFRunLoopRunInMode + 108 帧＃15：0x260bfac8 GraphicsServicesGSEventRunModal + 160 frame #16: 0x291940b8 UIKitUIApplicationMain + 144 帧＃17：0x001cb6f0 guestperiencemain(argc=1, argv=0x00473b5c) + 106 at main.m:16 frame #18: 0x24777872 libdyld.dylibstart + 2
更新3
我已在控制台中执行此命令以查看JSON，并且对我来说看起来是正确的：
(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
}
1 个答案:
答案 0 :(得分：1)
修改块内的变量时，必须使用__block说明符
__block NSDictionary *dConfiguration;
__block NSData *serviceData = data;
dispatch_async(dispatch_get_main_queue(), ^{
//...
});
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