IOS异常日志记录与展现功能

在平常的APP开发过程中经常碰到程序遇到异常闪退的问题，通过日志可以把相关的详细错误信息进行记录，本实例要记录不管在哪个页面出错都要进行记录，这边使用到的日志记录插件CocoaLumberjack，以文本的形式记录错误信息，然后再去读取各个文本的内容进行展示；当然现在有很多第三方的插件比如友盟也已经集成错误记录的功能；

效果图如下：

1：封装DDLogger的类

MyFileLogger.h文件

#import <Foundation/Foundation.h>
#import <CocoaLumberjack.h>

@interface MyFileLogger : NSObject
@property (nonatomic, strong, readwrite) DDFileLogger *fileLogger;

+(MyFileLogger *)sharedManager;

@end

MyFileLogger.m文件

#import "MyFileLogger.h"

@implementation MyFileLogger

#pragma mark - Inititlization
- (instancetype)init
{
    self = [super init];

    if (self) {
        [self configureLogging];
    }
    return self;
}

#pragma mark 单例模式

static MyFileLogger *sharedManager=nil;

+(MyFileLogger *)sharedManager
{
    static dispatch_once_t once;
    dispatch_once(&once, ^{
        sharedManager=[[self alloc]init];
    });
    return sharedManager;
}

#pragma mark - 配记日志类型

- (void)configureLogging
{
#ifdef DEBUG
    [DDLog addLogger:[DDASLLogger sharedInstance]];
    [DDLog addLogger:[DDTTYLogger sharedInstance]];
#endif
    [DDLog addLogger:self.fileLogger];
}

#pragma mark - 初始化文件记录类型

- (DDFileLogger *)fileLogger
{
    if (!_fileLogger) {
        DDFileLogger *fileLogger = [[DDFileLogger alloc] init];
        fileLogger.rollingFrequency = 60 * 60 * 24; // 24 hour rolling
        fileLogger.logFileManager.maximumNumberOfLogFiles = 7;

        _fileLogger = fileLogger;
    }

    return _fileLogger;
}
@end

这边是设置24小时进行记录一个文件

2：出进异常进行记录

MyExceptionHandler.h文件

#import <Foundation/Foundation.h>
#import <CocoaLumberjack.h>

@interface MyExceptionHandler : NSObject

+ (void)setDefaultHandler;
+ (NSUncaughtExceptionHandler *)getHandler;
+ (void)TakeException:(NSException *) exception;

@end

#import "MyExceptionHandler.h"

void UncaughtExceptionHandler(NSException * exception)
{
    NSArray * arr = [exception callStackSymbols];
    NSString * reason = [exception reason];
    NSString * name = [exception name];
    NSString * url = [NSString stringWithFormat:@"========异常错误报告========\nname:%@\nreason:\n%@\ncallStackSymbols:\n%@",name,reason,[arr componentsJoinedByString:@"\n"]];
    DDLogError(@"%@\n\n",url);
}

@implementation MyExceptionHandler

+ (void)setDefaultHandler
{
    NSSetUncaughtExceptionHandler(&UncaughtExceptionHandler);
}

+ (NSUncaughtExceptionHandler *)getHandler
{
    return NSGetUncaughtExceptionHandler();
}

+ (void)TakeException:(NSException *)exception
{
    NSArray * arr = [exception callStackSymbols];
    NSString * reason = [exception reason];
    NSString * name = [exception name];
    NSString * url = [NSString stringWithFormat:@"========异常错误报告========\nname:%@\nreason:\n%@\ncallStackSymbols:\n%@",name,reason,[arr componentsJoinedByString:@"\n"]];
    DDLogError(@"%@",url);
}
@end

这个文件也是当出现异常会执行

3：AppDelegate配置的内容

AppDelegate.h文件内容

#import <UIKit/UIKit.h>
#import <DDLog.h>
#import <CocoaLumberjack.h>
#import "MyExceptionHandler.h"
#import "MyFileLogger.h"

@interface AppDelegate : UIResponder <UIApplicationDelegate>

@property (strong, nonatomic) UIWindow *window;
@property (nonatomic, strong) MyFileLogger *logger;

@end

AppDelegate.m文件:

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

static const int ddLogLevel = LOG_LEVEL_VERBOSE;

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    //初始化
    [MyExceptionHandler setDefaultHandler];
    self.logger=[[MyFileLogger alloc]init];

    NSString *path = NSHomeDirectory();//主目录
    NSLog(@"当前项目的路径:%@",path);

    return YES;
}

- (void)applicationWillResignActive:(UIApplication *)application {
}

- (void)applicationDidEnterBackground:(UIApplication *)application {

}

- (void)applicationWillEnterForeground:(UIApplication *)application {
}

- (void)applicationDidBecomeActive:(UIApplication *)application {
}

- (void)applicationWillTerminate:(UIApplication *)application {
}

@end

这边重点是设置DDLOG的记录等级ddLogLevel，以及上面两个文件的初始化[MyExceptionHandler setDefaultHandler];self.logger=[[MyFileLogger alloc]init];

实现上面的代码已经能够记录异常的内容；

4：创建一个错误的异常代码

- (void)viewDidLoad {
    [super viewDidLoad];

    NSArray *test=@[@"123",@"444"];
    id testID=test[5];
}

执行到这段代码便记录异常的内容，接着进行内容的展示，是以一个列表展示每个日志文件，然后一个详细页面进行展示；

5：日志列表

loggerTableViewController.h文件

#import <UIKit/UIKit.h>
#import <CocoaLumberjack.h>
#import "AppDelegate.h"
#import "LoggerDetailViewController.h"

@interface loggerTableViewController : UIViewController

@end

#import "loggerTableViewController.h"

#define BLSRecyclingRecordViewController_CellIdentifier @"MyTablecell"

@interface loggerTableViewController ()<UITableViewDataSource, UITableViewDelegate>
@property (strong, nonatomic) UITableView *myTableView;
@property (nonatomic, strong) NSDateFormatter *dateFormatter;
@property (nonatomic, weak) DDFileLogger *fileLogger;
@property (nonatomic, strong) NSArray *logFiles;
@end

@implementation loggerTableViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    //加载日志文件
    AppDelegate *delegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
    _fileLogger = delegate.logger.fileLogger;

    [self loadLogFiles];

    if (!_myTableView) {
        _myTableView = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width, [[UIScreen mainScreen] bounds].size.height) style:UITableViewStyleGrouped];
        _myTableView.showsVerticalScrollIndicator = NO;
        _myTableView.showsHorizontalScrollIndicator=NO;
        _myTableView.dataSource = self;
        _myTableView.delegate = self;
        [_myTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:BLSRecyclingRecordViewController_CellIdentifier];
        [self.view addSubview:_myTableView];
    }
}

//读取日志的文件个数
- (void)loadLogFiles
{
    self.logFiles = self.fileLogger.logFileManager.sortedLogFileInfos;
}

//时间格式
- (NSDateFormatter *)dateFormatter
{
    if (_dateFormatter) {
        return _dateFormatter;
    }
    _dateFormatter = [[NSDateFormatter alloc] init];
    [_dateFormatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];
    return _dateFormatter;
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}

#pragma mark - Table view data source

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
    if (section==0) {
        return 40;
    }
    return 10;
}

- (CGFloat)tableView:(UITableView *)tableView heightForFooterInSection:(NSInteger)section
{
    return 1;
}

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return 2;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    if (section == 0) {
        return self.logFiles.count;
    }

    return 1;
}

- (UIView *)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
    UIView *headView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, [[UIScreen mainScreen] bounds].size.width, 30)];
    if (section==0) {
        UILabel *myLabel=[[UILabel alloc]initWithFrame:CGRectMake(10, 10, [[UIScreen mainScreen] bounds].size.width, 30)];
        myLabel.text=@"日记列表";
        [headView addSubview:myLabel];
    }

    return headView;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:BLSRecyclingRecordViewController_CellIdentifier];
    if (indexPath.section == 0) {
        DDLogFileInfo *logFileInfo = (DDLogFileInfo *)self.logFiles[indexPath.row];
        cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
        cell.textLabel.text = indexPath.row == 0 ? NSLocalizedString(@"当前", @"") : [self.dateFormatter stringFromDate:logFileInfo.creationDate];
        cell.textLabel.textAlignment = NSTextAlignmentLeft;
    } else {
        cell.accessoryType = UITableViewCellAccessoryNone;
        cell.textLabel.textAlignment = NSTextAlignmentCenter;
        cell.textLabel.text = NSLocalizedString(@"清理旧的记录", @"");
    }
    return cell;
}

#pragma mark - Table view delegate

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    [tableView deselectRowAtIndexPath:indexPath animated:YES];

    if (indexPath.section == 0) {
        DDLogFileInfo *logFileInfo = (DDLogFileInfo *)self.logFiles[indexPath.row];
        NSData *logData = [NSData dataWithContentsOfFile:logFileInfo.filePath];
        NSString *logText = [[NSString alloc] initWithData:logData encoding:NSUTF8StringEncoding];

        LoggerDetailViewController *detailViewController = [[LoggerDetailViewController alloc] initWithLog:logText
                                                                                                       forDateString:[self.dateFormatter stringFromDate:logFileInfo.creationDate]];
        [self.navigationController pushViewController:detailViewController animated:YES];
    } else {
        for (DDLogFileInfo *logFileInfo in self.logFiles) {
            //除了当前 其它进行清除
            if (logFileInfo.isArchived) {
                [[NSFileManager defaultManager] removeItemAtPath:logFileInfo.filePath error:nil];
            }
        }

        [self loadLogFiles];
        [self.myTableView reloadData];
    }
}

@end

这边把表格分成两部分，一部分是日志文件的列表，以及一个清除功能，清除功能主要是对先前的文件进行删除的操作，读取日志的个数及日志时间，日志详细内容

DDLogFileInfo

6：异常的详细信息页面

LoggerDetailViewController.h代码

#import <UIKit/UIKit.h>

@interface LoggerDetailViewController : UIViewController

- (id)initWithLog:(NSString *)logText forDateString:(NSString *)logDate;
@end

LoggerDetailViewController.m文件

#import "LoggerDetailViewController.h"

@interface LoggerDetailViewController ()
@property (nonatomic, strong) NSString *logText;
@property (nonatomic, strong) NSString *logDate;
@property (nonatomic, strong) UITextView *textView;
@end

@implementation LoggerDetailViewController

- (void)viewDidLoad {
    [super viewDidLoad];

    self.textView = [[UITextView alloc] initWithFrame:self.view.bounds];
    self.textView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    self.textView.editable = NO;
    self.textView.text = self.logText;
    [self.view addSubview:self.textView];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (id)initWithLog:(NSString *)logText forDateString:(NSString *)logDate
{
    self = [super initWithNibName:nil bundle:nil];
    if (self) {
        _logText = logText;
        _logDate = logDate;
        self.title = logDate;
    }
    return self;
}

@end

7:如果有第三方其它记录异常的使用，最好用DEBUG模式本地记录异常日志，不然日志只会被记录在一个地方

    //友盟统计加载
    [HYBUMAnalyticsHelper UMAnalyticStart];

    #ifdef DEBUG
    //日志框架(放在其它SDK下面 MyExceptionHandler)
    [MyExceptionHandler setDefaultHandler];
    #else

    #endif

    [MyFileLogger sharedManager];

这样便可以实现不管在哪个页面出出异常都可以进行记录，因为实例比较小，如果要源代码可以留下邮箱统一进行发送；