取沙盒日志的方法
1.手机连接Mac电脑，打开Xcode。
2.选择顶栏的 Windows 下的 Devices。
3.在 Devices 栏下先选择当前连接的手机设备。
4.在 Installed Apps 栏下选择你开发的App（需要取沙盒文件的App）。
5.点击底部 齿轮图案 的按钮，选择 Download Container…
将输出日志(NSLog)写入沙盒文件
#pragma mark - 自定义方法,将nslog的输出信息写入到NSLog.txt文件中
- (void)nslogToFile {
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentDirectory = [paths objectAtIndex:0];
NSString *fileName = [NSString stringWithFormat:@"NSLog.txt"];// 注意不是NSData!
NSString *logFilePath = [documentDirectory stringByAppendingPathComponent:fileName];
// 先删除已经存在的文件
NSFileManager *defaultManager = [NSFileManager defaultManager];
[defaultManager removeItemAtPath:logFilePath error:nil];
// 将log输入到文件
freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stdout);
freopen([logFilePath cStringUsingEncoding:NSASCIIStringEncoding], "a+", stderr);
}
补充[2021-8-4] Log 写入文件【此方式控制台打印+控制台输出】
上述nslogToFile调用后,控制台将不能打印相关日志:
注意引入头文件 #import <sys/time.h>
+(void)writeToFile:(NSString *)name andInfo:(id )info {
RKWriteToFile(name, info);
}
void RKWriteToFile(NSString *name, NSString *format, ...) {
va_list L;
va_start(L, format);
NSString *message = [[NSString alloc] initWithFormat:format arguments:L];
message = [name stringByAppendingFormat:@" => %@",message];
NSLog(@"%@", message);
// 开启异步子线程，将打印写入文件
dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
NSFileHandle *output = RKLogFileHandle();
if (output != nil) {
time_t rawtime;
struct tm timeinfo;
char buffer[64];
time(&rawtime);
localtime_r(&rawtime, &timeinfo);
struct timeval curTime;
gettimeofday(&curTime, NULL);
int milliseconds = curTime.tv_usec / 1000;
strftime(buffer, 64, "%Y-%m-%d %H:%M", &timeinfo);
char fullBuffer[128] = { 0 };
snprintf(fullBuffer, 128, "%s:%2d.%.3d ", buffer, timeinfo.tm_sec, milliseconds);
[output writeData:[[[NSString alloc] initWithCString:fullBuffer encoding:NSASCIIStringEncoding] dataUsingEncoding:NSUTF8StringEncoding]];
[output writeData:[message dataUsingEncoding:NSUTF8StringEncoding]];
static NSData *returnData = nil;
if (returnData == nil)
returnData = [@"\n" dataUsingEncoding:NSUTF8StringEncoding];
[output writeData:returnData];
}
});
va_end(L);
}
static NSFileHandle *RKLogFileHandle(){
static NSFileHandle *fileHandle = nil;
static dispatch_once_t onceToken;
dispatch_once(&onceToken, ^{
NSFileManager *fileManager = [[NSFileManager alloc] init];
NSString *documentsDirectory = [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];;
NSString *currentFilePath = [documentsDirectory stringByAppendingPathComponent:@"application-0.log"];
NSString *oldestFilePath = [documentsDirectory stringByAppendingPathComponent:@"application-60.log"];
//60文件存在，删除
if ([fileManager fileExistsAtPath:oldestFilePath]){
[fileManager removeItemAtPath:oldestFilePath error:nil];
}
//遍历文件，将文件编号往后移动，新增第0的一个文件
for (int i = 60 - 1; i >= 0; i--) {
NSString *filePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"application-%d.log", i]];
NSString *nextFilePath = [documentsDirectory stringByAppendingPathComponent:[NSString stringWithFormat:@"application-%d.log", i + 1]];
if ([fileManager fileExistsAtPath:filePath]) {
[fileManager moveItemAtPath:filePath toPath:nextFilePath error:nil];
}
}
[fileManager createFileAtPath:currentFilePath contents:nil attributes:nil];
fileHandle = [NSFileHandle fileHandleForWritingAtPath:currentFilePath];
[fileHandle truncateFileAtOffset:0];
});
return fileHandle;
}
