【代码笔记】将log日志保存到文件

代码：

#import "AppDelegate.h"
#import "RootViewController.h"

@implementation AppDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions { self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]]; // Override point for customization after application launch.
 RootViewController *rootVC=[[RootViewController alloc]init]; UINavigationController *nav=[[UINavigationController alloc]initWithRootViewController:rootVC]; self.window.rootViewController=nav; //将log日志保存到文件
    #ifdef BH_DEBUG [self redirectNSLogToDocumentFolder]; #else
        
    #endif self.window.backgroundColor = [UIColor whiteColor]; [self.window makeKeyAndVisible]; return YES; } - (void)redirectNSLogToDocumentFolder { //如果已经连接Xcode调试则不输出到文件
    if(isatty(STDOUT_FILENO)) { return; } UIDevice *device = [UIDevice currentDevice]; //在模拟器不保存到文件中
    if([[device model] hasSuffix:@"Simulator"]){ return; } //将NSlog打印信息保存到Document目录下的Log文件夹下
    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"]; //每次启动后都保存一个新的日志文件中
    NSString *dateStr = [formatter stringFromDate:[NSDate date]]; NSString *logFilePath = [logDirectory stringByAppendingFormat:@"/%@.log",dateStr]; //将log输入到文件
    freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stdout); freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stderr); //未捕获的Objective-C异常日志
    NSSetUncaughtExceptionHandler (&UncaughtExceptionHandler); } void UncaughtExceptionHandler(NSException* exception) { NSString* name = [ exception name ]; NSString* reason = [ exception reason ]; NSArray* symbols = [ exception callStackSymbols ]; //异常发生时的调用栈
    NSMutableString* strSymbols = [ [ NSMutableString alloc ] init ]; //将调用栈拼成输出日志的字符串
    for ( NSString* item in symbols ) { [strSymbols appendString: item ]; [strSymbols appendString: @"\r\n" ]; } //将crash日志保存到Document目录下的Log文件夹下
    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]; //把错误日志写到文件中
    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]; } //把错误日志发送到邮箱 // NSString *urlStr = [NSString stringWithFormat:@"mailto://[email protected]?subject=bug报告&body=感谢您的配合!<br><br><br>错误详情:<br>%@",crashString ]; // NSURL *url = [NSURL URLWithString:[urlStr stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; // [[UIApplication sharedApplication] openURL:url];
}