- (void)redirectNSLogToDocumentFolder
{
//如果已經(jīng)連接X(jué)code調(diào)試則不輸出到文件
//該函數(shù)用于檢測(cè)輸出 (STDOUT_FILENO) 是否重定向 是個(gè) Linux 程序方法
if(isatty(STDOUT_FILENO)) {
return;
}

// 判斷 當(dāng)前是否在 模擬器環(huán)境 下 在模擬器不保存到文件中
UIDevice *device = [UIDevice currentDevice];
if([[device model] hasSuffix:@"Simulator"]){
return;
}

//將NSlog打印信息保存到Document目錄下的Log文件夾下
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *logDirectory = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Log"];

NSFileManager *fileManager = [NSFileManager defaultManager];
BOOL fileExists = [fileManager fileExistsAtPath:logDirectory];
if (!fileExists) {
[fileManager createDirectoryAtPath:logDirectory withIntermediateDirectories:YES attributes:nil error:nil];
}

NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"]];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; //每次啟動(dòng)后都保存一個(gè)新的日志文件中
NSString *dateStr = [formatter stringFromDate:[NSDate date]];
NSString *logFilePath = [logDirectory stringByAppendingFormat:@"/%@.log",dateStr];

// 將log輸入到文件
freopen([logFilePath cStringUsingEncoding:NSUTF8StringEncoding], "a+", stdout);
freopen([logFilePath cStringUsingEncoding:NSUTF8StringEncoding], "a+", stderr);

//未捕獲的Objective-C異常日志
NSSetUncaughtExceptionHandler (&UncaughtExceptionHandler);
}

void NSSetUncaughtExceptionHandler(NSUncaughtExceptionHandler *);

typedef void NSUncaughtExceptionHandler(NSException *exception);

void UncaughtExceptionHandler(NSException* exception)
{
NSString* name = [ exception name ];
NSString* reason = [ exception reason ];
NSArray* symbols = [ exception callStackSymbols ]; // 異常發(fā)生時(shí)的調(diào)用棧
NSMutableString* strSymbols = [ [ NSMutableString alloc ] init ]; //將調(diào)用棧拼成輸出日志的字符串
for ( NSString* item in symbols )
{
[ strSymbols appendString: item ];
[ strSymbols appendString: @"\r\n" ];
}

//將crash日志保存到Document目錄下的Log文件夾下
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *logDirectory = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"Log"];

NSFileManager *fileManager = [NSFileManager defaultManager];
if (![fileManager fileExistsAtPath:logDirectory]) {
[fileManager createDirectoryAtPath:logDirectory withIntermediateDirectories:YES attributes:nil error:nil];
}

NSString *logFilePath = [logDirectory stringByAppendingPathComponent:@"UncaughtException.log"];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
[formatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"zh_CN"]];
[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
NSString *dateStr = [formatter stringFromDate:[NSDate date]];

NSString *crashString = [NSString stringWithFormat:@"<- %@ ->[ Uncaught Exception ]\r\nName: %@, Reason: %@\r\n[ Fe Symbols Start ]\r\n%@[ Fe Symbols End ]\r\n\r\n", dateStr, name, reason, strSymbols];
//把錯(cuò)誤日志寫(xiě)到文件中
if (![fileManager fileExistsAtPath:logFilePath]) {
[crashString writeToFile:logFilePath atomically:YES encoding:NSUTF8StringEncoding error:nil];
}else{
NSFileHandle *outFile = [NSFileHandle fileHandleForWritingAtPath:logFilePath];
[outFile seekToEndOfFile];
[outFile writeData:[crashString dataUsingEncoding:NSUTF8StringEncoding]];
[outFile closeFile];
}

//把錯(cuò)誤日志發(fā)送到郵箱
// NSString *urlStr = [NSString stringWithFormat:@"mailto://XXXXX@126.com?subject=bug報(bào)告&body=感謝您的配合!<br><br><br>錯(cuò)誤詳情:<br>%@",crashString ];
// NSURL *url = [NSURL URLWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]];
// [[UIApplication sharedApplication] openURL:url];
}