当app出现崩溃, 研发阶段一般可以通过以下方式来跟踪crash信息
#1.模拟器运行, 查看xcode错误日志
#2.真机调试, 查看xcode错误日志
#3.真机运行, 查看device系统日志
下面举例说明, 先写一段会Crash的代码crashdemo:
- (void)viewDidLoad { [super viewDidLoad]; // Do any additional setup after loading the view, typically from a nib. [self performSelector:@selector(print) withObject:nil afterDelay:5];}- (void)print { NSArray *array = @[]; NSLog(@"%@", array[1]);}
Demo#1.模拟器运行, 查看xcode错误日志
程序执行后会立即崩溃, 打开xcode系统日志可以看到以下错误信息
2016-10-29 12:13:29.015 CrashDemo[37842:7436441] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArray0 objectAtIndex:]: index 1 beyond bounds for empty NSArray'*** First throw call stack:( 0 CoreFoundation 0x00b7ba84 __exceptionPreprocess + 180 1 libobjc.A.dylib 0x00642e02 objc_exception_throw + 50 2 CoreFoundation 0x00b22390 __CFArrayGetTypeID_block_invoke + 0 3 CoreFoundation 0x00ac07f8 -[NSArray objectAtIndexedSubscript:] + 40 4 CrashDemo 0x000877b7 -[ViewController print] + 87 5 Foundation 0x00250d71 __NSFireDelayedPerform + 442 6 CoreFoundation 0x00acd576 __CFRUNLOOP_IS_CALLING_OUT_TO_A_TIMER_CALLBACK_FUNCTION__ + 22 7 CoreFoundation 0x00accf72 __CFRunLoopDoTimer + 1250 8 CoreFoundation 0x00a8b25a __CFRunLoopRun + 2202 9 CoreFoundation 0x00a8a706 CFRunLoopRunSpecific + 470 10 CoreFoundation 0x00a8a51b CFRunLoopRunInMode + 123 11 GraphicsServices 0x041e4664 GSEventRunModal + 192 12 GraphicsServices 0x041e44a1 GSEventRun + 104 13 UIKit 0x00f0c1eb UIApplicationMain + 160 14 CrashDemo 0x00087bba main + 138 15 libdyld.dylib 0x03189a21 start + 1)libc++abi.dylib: terminating with uncaught exception of type NSException(lldb)
通过xcode日志可以看到是数组访问越界, 发生越界的方式名为print 针对这个demo我们当然很清楚是刚才列的array[1]发生越界, 但对于一个完整的程序如何查看是在哪个地方发生越界的呢? 这个时候我们可以利用xcode的Show the breakpoint navigator功能, 点加号选择add exception breakpoint 这个时候我们在执行程序, xcode执行会自动停在要发生crash的代码段 Demo#2.真机调试, 查看xcode错误日志 如果有添加exeception point, 程序会自动停到打印array[1]那一行. 如果没有添加则程序会crash, xcode会出现以下错误日志
2016-10-29 12:15:53.561 CrashDemo[1062:316582] *** Terminating app due to uncaught exception 'NSRangeException', reason: '*** -[__NSArray0 objectAtIndex:]: index 1 beyond bounds for empty NSArray'*** First throw call stack:(0x211b398b 0x2094ee17 0x211433e7 0xc5a3b 0x219d1ad5 0x211765ff 0x21176231 0x2117407d 0x210c32e9 0x210c30d5 0x226b3ac9 0x257880b9 0xc5c99 0x20d6b873)libc++abi.dylib: terminating with uncaught exception of type NSException(lldb)
通过错误信息我们只能看到是有发生数组访问越界, 如果有添加exeception breakpoint则会自动停在发生error的代码行.
Demo#3. 真机运行, 查看device系统日志
xcode停止运行这个crashdemo, 选择xcode window - devices, 选择手机 - view device logs
然后在手机上运行crashdemo, 在device logs中按时间排序查看最新的log就能看到crashdemo的crash log
Incident Identifier: 9A4C52F0-B0D7-42C9-A7CB-D4D3321D00D5CrashReporter Key: 90f4d3621773443794fa73f506fd6bdef49fc269Hardware Model: iPhone4,1Process: CrashDemo [1074]Path: /private/var/containers/Bundle/Application/1307034E-9C2B-451F-ACD9-04C97DEC047B/CrashDemo.app/CrashDemoIdentifier: PEGA.CrashDemoVersion: 1 (1.0)Code Type: ARM (Native)Parent Process: launchd [1]Date/Time: 2016-10-29 12:21:49.49 +0800Launch Time: 2016-10-29 12:21:43.43 +0800OS Version: iOS 9.3.1 (13E238)Report Version: 104Exception Type: EXC_CRASH (SIGABRT)Exception Codes: 0x0000000000000000, 0x0000000000000000Exception Note: EXC_CORPSE_NOTIFYTriggered by Thread: 0Filtered syslog:None foundLast Exception Backtrace:0 CoreFoundation 0x211b3986 __exceptionPreprocess + 1221 libobjc.A.dylib 0x2094ee12 objc_exception_throw + 342 CoreFoundation 0x211433e2 -[__NSArray0 objectAtIndex:] + 1103 CrashDemo 0x000e6a36 0xe0000 + 271904 Foundation 0x219d1ad0 __NSFireDelayedPerform + 4645 CoreFoundation 0x211765fa
这些在开发阶段都能很简便的实现, 但是当app发布出去后用户发生crash呢? 一般用户只能反馈在做什么的时候发生crash
然后我们在去做尝试是否能遇到, 不过这样效率不高而且一般很难复现到用户的crash
Bugly的出现解决的这个问题
Bugly SDK在当程序崩溃时, 会自动将错误信息发送到服务器方便开发人员查看分析
那么如何使用Bugly?
首先先到https://bugly.qq.com/v2/注册账号, 并注册app下载SDK包
将Bugly.framework拖拽到工程中, 记得勾选copy if needed.
然后添加libz.tbd / libstdc++.tbd / Security.framework / SystemConfiguration.framework到工程中
delegate.m中注册
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { [Bugly startWithAppId:@"此处替换为你的AppId"]; return YES; } 这样当程序发生崩溃时, 崩溃信息会自动发送到服务器登录你的bugly账号就能查看到了
