在我們開發的應用中，總是不可避免地會產生Bug。要是能夠把應用的崩潰資訊收集起來並傳到我們能夠接收到的地方，那麼對於已釋出上線的應用所發生的崩潰我們就能夠很好地對其進行分析了。

這裡要提到的一個函式就是在iOS SDK中自帶的NSSetUncaughtExceptionHandler，可用來做異常處理，但功能較為有限，而引起崩潰的大多數原因如：記憶體訪問錯誤，重複釋放等錯誤就無能為力了，因為這種錯誤它丟擲的是Signal，所以必須要專門做Signal處理。

下面分享我的做法：

在AppDelegate.m檔案中的didFinishLaunchingWithOptions方法中，

    [self
 
 creatExceptionText];

    //註冊異常崩潰訊息處理函式的處理方法
    NSSetUncaughtExceptionHandler (&UncaughtExceptionHandler);

void UncaughtExceptionHandler(NSException *exception) {
    NSMutableDictionary *logDic = [[NSMutableDictionary alloc]init];
    [logDic setObject:[NSDate date] forKey:@"date"];

    // exception info 崩潰/異常資訊
 

    NSArray *arr = [exception callStackSymbols];
    NSString *reason = [exception reason];
    NSString *name = [exception name];
    [logDic setObject:name forKey:@"name"];
    [logDic setObject:reason forKey:@"reason"];
    [logDic setObject:[arr componentsJoinedByString:@"\n"] forKey:@"log"];

    // Device info 裝置資訊
 

    [logDic setObject:[UIDevice currentDevice].model forKey:@"device"];
    [logDic setObject:[UIDevice currentDevice].systemVersion forKey:@"osversion"];

    // batteryLevel info 電池剩餘電量資訊
    [[UIDevice currentDevice] setBatteryMonitoringEnabled:YES];
    [logDic setObject:[NSNumber numberWithFloat:[UIDevice currentDevice].batteryLevel*100] forKey:@"batteryLevel"];
    [[UIDevice currentDevice] setBatteryMonitoringEnabled:NO];

    NSString *path = logPathUrl();
    NSDictionary *logfile = [NSDictionary dictionaryWithDictionary:logDic];
    [logfile writeToFile:path atomically:YES];//把錯誤日誌寫入檔案
}

/**
 獲取崩潰日誌的檔案路徑

 @return 崩潰日誌的檔案路徑
 */
NSString *logPathUrl() {
    return [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) lastObject] stringByAppendingPathComponent:@"Carsh.txt"];
}

- (void)creatExceptionText{
    NSFileManager *fileManager = [NSFileManager defaultManager];
    NSArray *document = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
    NSString *docu = [document firstObject];
    NSString *filePath = [docu stringByAppendingPathComponent:@"Carsh.txt"];
    if (![fileManager fileExistsAtPath:filePath]) {
        [fileManager createFileAtPath:filePath contents:nil attributes:nil];
    }
    else{
        //1、日誌是否有內容
        NSData *data = [NSData dataWithContentsOfFile:filePath];
        if (data.length > 0) {
            //2、則把崩潰日誌檔案上傳至伺服器中
            if ([Utils httpPostCrashFile:filePath]) {
                //3、最後是否成功移除崩潰日誌
                if([fileManager removeItemAtPath:filePath error:nil]){
                    NSLog(@"Carsh.txt remove successful");
                }
            }
        }
    }
}