【IOS】異常捕獲 拒絕閃退 讓應用從容的崩潰 UncaughtExceptionHandler
阿新 • • 發佈：2019-03-11
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然後在delegate文件中面- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions函數裏面
IOS SDK中提供了一個現成的函數 NSSetUncaughtExceptionHandler 用來做異常處理。但功能很有限。而引起崩潰的大多數原因如：內存訪問錯誤。反復釋放等錯誤就無能為力了，由於這樣的錯誤它拋出的是Signal。所以必需要專門做Signal處理。
首先定義一個UncaughtExceptionHandler類。代碼例如以下：
#import <Foundation/Foundation.h> #import <UIKit/UIKit.h> @interface UncaughtExceptionHandler : NSObject { BOOL dismissed; } +(void) InstallUncaughtExceptionHandler; @end
//利用 NSSetUncaughtExceptionHandler，當程序異常退出的時候，能夠先進行處理。然後做一些自己定義的動作，比方以下一段代碼，就是網上有人寫的，直接在發生異常時給某人發送郵件。</span>
void UncaughtExceptionHandlers (NSException *exception);#import "UncaughtExceptionHandler.h" #include <libkern/OSAtomic.h> #include <execinfo.h> 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; NSString* getAppInfo() { NSString *appInfo = [NSString stringWithFormat:@"App : %@ %@(%@)\nDevice : %@\nOS Version : %@ %@\n", [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleDisplayName"], [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleShortVersionString"], [[NSBundle mainBundle] objectForInfoDictionaryKey:@"CFBundleVersion"], [UIDevice currentDevice].model, [UIDevice currentDevice].systemName, [UIDevice currentDevice].systemVersion]; // [UIDevice currentDevice].uniqueIdentifier]; NSLog(@"Crash!!!! %@", appInfo); return appInfo; } void MySignalHandler(int signal) { int32_t exceptionCount = OSAtomicIncrement32(&UncaughtExceptionCount); if (exceptionCount > UncaughtExceptionMaximum) { return; } if(signal==11) {//比較坑爹的是 我遇到的一個問題僅僅有iPhone5出現故障 可是我這邊測試的沒有iPhone5 無法直接log 可能是內存不足 果然 刪除幾個應用就能夠了 所以加了這句
UIAlertView * tip2 = [[UIAlertView alloc]initWithTitle:@"可能原因:key" message:@"內存不足" delegate:nil cancelButtonTitle:@"ok" otherButtonTitles:nil];
[tip2 show];
[tip2 release];
}
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:
[NSException
exceptionWithName:UncaughtExceptionHandlerSignalExceptionName
reason:
[NSString stringWithFormat:
NSLocalizedString(@"Signal %d was raised.\n"
@"%@", nil),
signal, getAppInfo()]
userInfo:
[NSDictionary
dictionaryWithObject:[NSNumber numberWithInt:signal]
forKey:UncaughtExceptionHandlerSignalKey]]
waitUntilDone:YES];
}
@implementation UncaughtExceptionHandler
+(void) InstallUncaughtExceptionHandler
{
signal(SIGABRT, MySignalHandler);
signal(SIGILL, MySignalHandler);
signal(SIGSEGV, MySignalHandler);
signal(SIGFPE, MySignalHandler);
signal(SIGBUS, MySignalHandler);
signal(SIGPIPE, MySignalHandler);
}
+ (NSArray *)backtrace
{
void* callstack[128];
int frames = backtrace(callstack, 128);
char **strs = backtrace_symbols(callstack, frames);
int i;
NSMutableArray *backtrace = [NSMutableArray arrayWithCapacity:frames];
for (
i = UncaughtExceptionHandlerSkipAddressCount;
i < UncaughtExceptionHandlerSkipAddressCount +
UncaughtExceptionHandlerReportAddressCount;
i++)
{
[backtrace addObject:[NSString stringWithUTF8String:strs[i]]];
}
free(strs);
return backtrace;
}
- (void)alertView:(UIAlertView *)anAlertView clickedButtonAtIndex:(NSInteger)anIndex
{
if (anIndex == 0)
{
dismissed = YES;
}
}
- (void)handleException:(NSException *)exception
{
UIAlertView *alert =
[[[UIAlertView alloc]
initWithTitle:NSLocalizedString(@"Unhandled exception", nil)
message:[NSString stringWithFormat:NSLocalizedString(
@"You can try to continue but the application may be unstable.\n"
@"%@\n%@", nil),
[exception reason],
[[exception userInfo] objectForKey:UncaughtExceptionHandlerAddressesKey]]
delegate:self
cancelButtonTitle:NSLocalizedString(@"Quit", nil)
otherButtonTitles:NSLocalizedString(@"Continue", nil), nil]
autorelease];
[alert show];
CFRunLoopRef runLoop = CFRunLoopGetCurrent();
CFArrayRef allModes = CFRunLoopCopyAllModes(runLoop);
while (!dismissed)
{
for (NSString *mode in (NSArray *)allModes)
{
CFRunLoopRunInMode((CFStringRef)mode, 0.001, false);
}
}
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])
{
kill(getpid(), [[[exception userInfo] objectForKey:UncaughtExceptionHandlerSignalKey] intValue]);
}
else
{
[exception raise];
}
}
void UncaughtExceptionHandlers (NSException *exception) {
NSArray *arr = [exception callStackSymbols];
NSString *reason = [exception reason];
NSString *name = [exception name];
NSString *urlStr = [NSString stringWithFormat:@"mailto://[email protected]? subject=bug報告&body=感謝您的配合!<br><br><br>"
"錯誤詳情:<br>%@<br>--------------------------<br>%@<br>---------------------<br>%@",
name,reason,[arr componentsJoinedByString:@"<br>"]];
NSURL *url = [NSURL URLWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
[[UIApplication sharedApplication] openURL:url];
//或者直接用代碼，輸入這個崩潰信息，以便在console中進一步分析錯誤原因
NSLog(@"1heqin, CRASH: %@", exception);
NSLog(@"heqin, Stack Trace: %@", [exception callStackSymbols]);
}
@end
然後在delegate文件中面- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions函數裏面
[UncaughtExceptionHandler InstallUncaughtExceptionHandler];
NSSetUncaughtExceptionHandler (&UncaughtExceptionHandlers);【IOS】異常捕獲 拒絕閃退 讓應用從容的崩潰 UncaughtExceptionHandler