- [NSRecursiveLock dealloc]：鎖理解堆棧跟蹤和ios調試

Question

我在我的代碼中有以下錯誤，我很難找出原因。

-[NSRecursiveLock dealloc]: lock (<NSRecursiveLock: 0x1e559730> '(null)') deallocated while still in use 
Break on _NSLockError() to debug. 

所以，我在NSLock錯誤上放了一個斷點。這裏是堆棧跟蹤。

frame #0: 0x327e5288 Foundation`_NSLockError 
frame #1: 0x327e6258 Foundation`-[NSRecursiveLock dealloc] + 108 
frame #2: 0x327478ba ExternalAccessory`-[EAInputStream dealloc] + 122 
frame #3: 0x32748420 ExternalAccessory`-[EAInputStream _streamEventTrigger] + 448 
frame #4: 0x31ebf682 CoreFoundation`__CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14 
frame #5: 0x31ebeee8 CoreFoundation`__CFRunLoopDoSources0 + 212 
frame #6: 0x31ebdcb6 CoreFoundation`__CFRunLoopRun + 646 
frame #7: 0x31e30ebc CoreFoundation`CFRunLoopRunSpecific + 356 
frame #8: 0x31e30d48 CoreFoundation`CFRunLoopRunInMode + 104 
frame #9: 0x359e32ea GraphicsServices`GSEventRunModal + 74 
frame #10: 0x33d46300 UIKit`UIApplicationMain + 1120 
frame #11: 0x0009e93e Checkout`main(argc=1, argv=0x2fd6ad20) + 174 at main.mm:15 
frame #12: 0x39fa1b20 libdyld.dylib`start + 4 

NSRecursiveLock Deallocated是一個類似的帖子，在那裏他解決了他的問題，更新的Xcode，但是這並沒有爲我工作=（我得到這個錯誤90％的時間和10％，其正常工作

在VC中的問題

我.h文件中...

#import <UIKit/UIKit.h> 
#import "SignalR.h" 
#import "ClientInterface.h" 

@class POS; 
@interface SignalRVC : UIViewController <UITableViewDelegate, UITableViewDataSource, UIAlertViewDelegate> 

@property (nonatomic, strong) NSString *stringFromScan; 

@property (weak, nonatomic) IBOutlet UITableView *tableView; 
@property (strong, nonatomic) NSMutableArray *data; 
@property (weak, nonatomic) IBOutlet UILabel *errorLabel; 

@property (strong, nonatomic, readwrite) SRHubConnection *connection; 
@property (strong, nonatomic, readwrite) SRHubProxy *hub; 
@property (strong, nonatomic) UIBarButtonItem *backBarButton; 
@property (nonatomic, strong) NSMutableArray *registeredUpcs; 
-(void)initConnection; 

@end 

我.m文件崩潰之前得到通過viewDidLoad中......

@interface SignalRVC() 
@property (strong,nonatomic) POS *myPOS; 

@property (nonatomic, strong) NSString *qrLocation; 
@property (nonatomic, strong) NSString *qrStation; 
@property (nonatomic, strong) NSString *RPHost; 
@property (nonatomic, strong) NSString *RPPort; 

@property (nonatomic, strong) NSString *registeredUpc; 
@property (nonatomic, strong) NSString *thumbnail; 
@property (nonatomic, strong) NSString *productName; 
@property (nonatomic, strong) NSString *color; 
@property (nonatomic, strong) NSString *alu; 
@property (nonatomic, strong) NSString *size; 
@property (nonatomic, strong) NSString *upc; 
@property (nonatomic, strong) NSDictionary *itemSpecs; 

@property (weak, nonatomic) IBOutlet UIButton *checkoutButton; 
@property (weak, nonatomic) IBOutlet UILabel *employeeLabel; 

@end 

@implementation SignalRVC 

-(void)viewWillDisappear:(BOOL)animated{ 
    [_myPOS closeConnection]; 
    self.navigationController.toolbarHidden = YES; 
} 
-(void)viewWillAppear:(BOOL)animated{ 
    self.navigationController.navigationBar.hidden = NO; 

    NSData *dataFromQR = [self.stringFromScan dataUsingEncoding:NSUTF8StringEncoding]; 

    NSDictionary *jsonQR = [NSJSONSerialization JSONObjectWithData:dataFromQR options:NSJSONReadingMutableContainers error:nil]; 

    self.qrLocation = [jsonQR valueForKey:@"loc"]; 
    self.qrStation = [jsonQR valueForKey:@"id"]; 
    self.host = [jsonQR valueForKey:@"host"]; 
    self.port = [jsonQR valueForKey:@"port"]; 
} 
- (void)viewDidLoad{ 
    [super viewDidLoad]; 

    //self.tableView.layer.cornerRadius = 10; 

    if(!_myPOS){ 
     _myPOS = [[POS alloc] init]; 
    } 
    _myPOS.mySignalRVC = self; 

} 

什麼是堆棧跟蹤告訴我，我能做些什麼來更好地理解問題？

具有NSRecursiveLock類是在AFJSONRequestOperation.m並作爲SignalR的一部分AFURLConnectionOperation.m文件，但斷點從來沒有在這些類中被觸發的唯一的地方...

感謝您的幫助。

Answer 1

從堆棧跟蹤看，它看起來像一個類型爲EAInputStream的對象擁有鎖對象，並且在鎖仍然生效時它將被釋放。快速谷歌搜索顯示EAInputStream是一個github框架。你是否補充說過，還是與你使用的另一個框架一起出現？