如何解决IOS设备上的应用程序随机崩溃？

Question

我正在使用swrevealviewController从一个视图滑动到另一个视图。 但是我的应用程序随机崩溃，当我从一个视图滑动到另一个视图时，在每个视图上，都有服务器调用以显示视频列表。

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{

    //NSLog(@"connection did finish loading %@",responseData);
    //NSString *str = [[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding];
    //NSLog(@"tdshjfhdkh %@",str);

    [self.resopnseDelagate carryData:responseData];
    responseData = nil;
}

我的应用程序在上述方法中随机崩溃，并在给定以下错误的情况下给出了错误提示：:: [viewController keep]：消息发送到已释放实例0xa081994e

我也使用Crashlytic来调试此问题，但无法理解其日志，如下所示：

Thread : Crashed: com.apple.main-thread
0  libobjc.A.dylib                0x3a78152c objc_retain + 11
1  DemoApp                       0x000d2c81 -[Connection connectionDidFinishLoading:] (Connection.m:76)
2  Foundation                     0x3341a6fd __65-[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:]_block_invoke_0 + 16
3  Foundation                     0x3335a1f9 -[NSURLConnectionInternal _withConnectionAndDelegate:onlyActive:] + 200
4  Foundation                     0x3335a115 -[NSURLConnectionInternal _withActiveConnectionAndDelegate:] + 60
5  CFNetwork                      0x327bc45f ___delegate_didFinishLoading_block_invoke_0 + 26
6  CFNetwork                      0x327bbb43 ___withDelegateAsync_block_invoke_0 + 54
7  CFNetwork                      0x327e3fcb ___performAsync_block_invoke_068 + 18
8  CoreFoundation                 0x32a2574d CFArrayApplyFunction + 176
9  CFNetwork                      0x327e442b RunloopBlockContext::perform() + 74
10 CFNetwork                      0x3274803d MultiplexerSource::perform() + 188
11 CoreFoundation                 0x32ab4683 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 14
12 CoreFoundation                 0x32ab3ee9 __CFRunLoopDoSources0 + 212
13 CoreFoundation                 0x32ab2cb7 __CFRunLoopRun + 646
14 CoreFoundation                 0x32a25ebd CFRunLoopRunSpecific + 356
15 CoreFoundation                 0x32a25d49 CFRunLoopRunInMode + 104
16 GraphicsServices               0x365e92eb GSEventRunModal + 74
17 UIKit                          0x3493b301 UIApplicationMain + 1120
18 DemoApp 

                  0x000da839 main (main.m:16)

请帮助我，谢谢。

Answer 1

您正在尝试使用内存中不再存在的视图控制器，因此请首先打开NSZombies以了解发生这种情况的方式。 如何在Xcode中启用NSZombie？

其次，在致电您的代表之前，您应该检查以确保其不为零

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{

    //NSLog(@"connection did finish loading %@",responseData);
    //NSString *str = [[NSString alloc]initWithData:responseData encoding:NSUTF8StringEncoding];
    //NSLog(@"tdshjfhdkh %@",str);

    if([self.responseDelagate respondsToSelector:@selector(carryData:)]) {
        [self.resopnseDelagate carryData:responseData];
    }
    responseData = nil;
}

Answer 2

尝试像这样在dealloc中释放responseData

-(void)dealloc{

 [repsonseData release];
 responseData = nil;

}

并在调用方法之前检查是否设置了responseDelegate