IOS開發筆記程式異常crash捕獲與攔截

開發ios應用，解決crash問題始終是乙個難題。crash分為兩種，一種是由exc_bad_access引起的，原因是訪問了不屬於本程序的記憶體位址，有可能是訪問已被釋放的記憶體；另一種是未**獲的objective-c異常（n***ception），導致程式向自身傳送了sigabrt訊號而崩潰。其實對於未捕獲的objective-c異常，我們是有辦法將它記錄下來的，如果日誌記錄得當，能夠解決絕大部分崩潰的問題。這裡對於ui執行緒與後台執行緒分別說明。

一：在.h檔案中編寫

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@inte***ce uncaughtexceptionhandler : nsobject

@end

void handleexception(n***ception *exception);

void signalhandler(int signal);

void installuncaughtexceptionhandler(void);

二：在.m檔案編寫

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#import "uncaughtexceptionhandler.h"

#include

nsstring * const uncaughtexceptionhandlersignalexceptionname = @"uncaughtexceptionhandlersignalexceptionname";

nsstring * const uncaughtexceptionhandlersignalkey = @"uncaughtexceptionhandlersignalkey";

nsstring * const uncaughtexceptionhandleraddresseskey = @"uncaughtexceptionhandleraddresseskey";

volatile int32_t uncaughtexceptioncount = 0;

const int32_t uncaughtexceptionmaximum = 10;

const nsinteger uncaughtexceptionhandlerskipaddresscount = 4;

const nsinteger uncaughtexceptionhandlerreportaddresscount = 5;

@implementation uncaughtexceptionhandler

+ (nsarray *)backtrace

free(strs);

return backtrace;

} - (void)alertview:(uialertview *)analertview clickedbuttonatindex:(nsinteger)anindex

else if (anindex==1)

}

- (void)handleexception:(n***ception *)exception

} cfrelease(allmodes);

nssetuncaughtexceptionhandler(null);

signal(sigabrt, sig_dfl);

signal(sigill, sig_dfl);

signal(sigsegv, sig_dfl);

signal(sigfpe, sig_dfl);

signal(sigbus, sig_dfl);

signal(sigpipe, sig_dfl);

if ([[exception name] isequal:uncaughtexceptionhandlersignalexceptionname])

else

} @end

void handleexception(n***ception *exception)

nsarray *callstack = [uncaughtexceptionhandler backtrace];

nsmutabledictionary *userinfo =

[nsmutabledictionary dictionarywithdictionary:[exception userinfo]];

[userinfo

setobject:callstack

forkey:uncaughtexceptionhandleraddresseskey];

[[[[uncaughtexceptionhandler alloc] init] autorelease]

performselectoronmainthread:@selector(handleexception:)

withobject:

[n***ception

exceptionwithname:[exception name]

reason:[exception reason]

userinfo:userinfo]

waituntildone:yes];

} void signalhandler(int signal)

nsmutabledictionary *userinfo =

[nsmutabledictionary

dictionarywithobject:[nsnumber numberwithint:signal]

forkey:uncaughtexceptionhandlersignalkey];

nsarray *callstack = [uncaughtexceptionhandler backtrace];

[userinfo

setobject:callstack

forkey:uncaughtexceptionhandleraddresseskey];

[[[[uncaughtexceptionhandler alloc] init] autorelease]

performselectoronmainthread:@selector(handleexception:)

withobject:

[n***ception

exceptionwithname:uncaughtexceptionhandlersignalexceptionname

reason:

[nsstring stringwithformat:

nslocalizedstring(@"signal %d was raised.", nil),

signal]

userinfo:

[nsdictionary

dictionarywithobject:[nsnumber numberwithint:signal]

forkey:uncaughtexceptionhandlersignalkey]]

waituntildone:yes];

} void installuncaughtexceptionhandler(void)

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installuncaughtexceptionhandler();

self.window = [[[uiwindow alloc] initwithframe:[[uiscreen mainscreen] bounds]] autorelease];

self.viewcontroller = [[[viewcontroller alloc] initwithnibname:@"viewcontroller" bundle:nil] autorelease];

self.window.rootviewcontroller = self.viewcontroller;

[self.window makekeyandvisible];

return yes;

}

四：最後的測試

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- (ibaction)onclcko:(id)sender

五：結果

六：注意是否有異常斷點，或者第三方sdk也在攔截crash，都有可能造成捕獲失敗

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