iOS 收集打印日志

可以将要在Xcode 控制台打印的日志写在沙盒，最后导出分享，进行问题分析。

正式版本不建议使用，避免增加用户内存。配合解决顽固 Bug 可以通过该方法收集打印日志

.h头文件

@interface LogManager : NSObject
+ (FSLogManager *)shareInstance;
- (void)redirectNSlogToDocumentFolder;
- (NSString *)logDirPath;
- (void)clearAllLog;
- (float)sizeOfLogs;
@end

.m实现文件

#import "LogManager.h"
#import <UIKit/UIKit.h>#define LOG_TIME_FORMAT @"yyyy-MM-dd HH:mm:ss.SSS"
#define LOG_QUEUE_ID "log_queue"static LogManager *manager = nil;/// 是否运行收集日志，如果为 YES , 将不会在日志控制台打印。
static BOOL const kAllowSaveLog = YES;@implementation LogManager
+ (LogManager *)shareInstance{static dispatch_once_t onceToken;dispatch_once(&onceToken, ^{manager = [[LogManager alloc] init];if (kAllowSaveLog) {[self setDefaultUncaughtExceptionHandler];}});return manager;
}
- (void)clearAllLog {NSArray<NSString *> *allPath = [self allLogPath];if (allPath.count == 0) {return;}[allPath enumerateObjectsUsingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {NSError *error;[[NSFileManager defaultManager] removeItemAtPath:obj error:&error];}];
}
- (void)redirectNSlogToDocumentFolder{if (kAllowSaveLog == NO) {return;}UIDevice *device = [UIDevice currentDevice];if ([[device model] isEqualToString:@"Simulator"]) {return;}NSDateFormatter *formatter = [[NSDateFormatter alloc] init];[formatter setDateFormat:@"yyyy-MM-dd HH:mm:ss"];NSString *dateString = [formatter stringFromDate:[NSDate date]];NSString *documentDirectory = [self logDirPath];NSString *fileName = [NSString stringWithFormat:@"%@-log.txt",dateString];NSString *logFilePath = [documentDirectory stringByAppendingPathComponent:fileName];// Delete existing files[[NSFileManager defaultManager] removeItemAtPath:logFilePath error:nil];//Enter the log into the file  （所有的打印都会存在该文件）freopen([logFilePath cStringUsingEncoding:NSUTF8StringEncoding], "a+", stdout);freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding],"a+",stderr);}- (float)sizeOfLogs{NSDirectoryEnumerator *direnum = [[NSFileManager defaultManager] enumeratorAtPath:[self logDirPath]];NSString *pname;int64_t s=0;while (pname = [direnum nextObject]){NSDictionary *currentdict=[direnum fileAttributes];NSString *filesize=[NSString stringWithFormat:@"%@",[currentdict objectForKey:NSFileSize]];NSString *filetype=[currentdict objectForKey:NSFileType];if([filetype isEqualToString:NSFileTypeDirectory]) continue;s=s+[filesize longLongValue];}return s*1.0;
}
- (NSString *)logDirPath {NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);NSString *documentDirectory = [paths objectAtIndex:0];NSString *logPath = [documentDirectory stringByAppendingPathComponent:@"Logs"];BOOL isDir = NO;BOOL isExist = [[NSFileManager defaultManager] fileExistsAtPath:logPath isDirectory:&isDir];if (isExist && isDir) {} else {NSError * createDirError;[[NSFileManager defaultManager] createDirectoryAtPath:logPath withIntermediateDirectories:YES attributes:nil error:&createDirError];}return logPath;
}
- (NSArray<NSString *> *)allLogPath {NSArray<NSString *> *items = [[NSFileManager defaultManager] contentsOfDirectoryAtPath:[self logDirPath] error:nil];NSMutableArray<NSString *> *paths = [NSMutableArray array];NSString *dirPath = [self logDirPath];[items enumerateObjectsUsingBlock:^(NSString * _Nonnull obj, NSUInteger idx, BOOL * _Nonnull stop) {[paths addObject:[dirPath stringByAppendingPathComponent:obj]];}];return paths;
}#pragma mark -设置crash
+ (void)setDefaultUncaughtExceptionHandler
{NSSetUncaughtExceptionHandler (&chUncaughtExceptionHandler);signal(SIGABRT, SignalHandler);signal(SIGILL, SignalHandler);signal(SIGSEGV, SignalHandler);signal(SIGFPE, SignalHandler);signal(SIGBUS, SignalHandler);signal(SIGPIPE, SignalHandler);}#pragma mark -获取崩溃日志
void chUncaughtExceptionHandler(NSException *exception)
{NSLog(@"Exception info --> %@",exception);
}void SignalHandler(int signal)
{//拦截signal
}@end

收集到的日志可以通过云端上传，也可以直接通过系统原生分享。

/// items 可以传文件路径path。 
+ (void)shareItems:(NSArray *)items  fromController:(UIViewController *)controller cancel:(void(^)(void))cancel completion:(void(^)(NSError * _Nullable error))completion {if (items.count == 0) {return;}//初始化：UIActivityViewController *activityVC = [[UIActivityViewController alloc] initWithActivityItems:items applicationActivities:nil];activityVC.completionWithItemsHandler = ^(UIActivityType  _Nullable activityType, BOOL completed, NSArray * _Nullable returnedItems, NSError * _Nullable activityError) {// 如果取消， completed返回 NOif (completed) {if (completion) {completion(activityError);}} else {if (cancel) {cancel();}}};//禁掉不用的服务activityVC.excludedActivityTypes = @[UIActivityTypePrint,UIActivityTypeAssignToContact];[controller presentViewController:activityVC animated:YES completion:nil];
}