获取系统的日期和时间戳

Question

我创建了一个将数据字符串写入文本文件的方法。我想知道我怎么能得到系统的日期和时间，并将其发送到文本文件?方法如下:

 -(void) writeToTextFile{
//get the documents dir
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];
//file name to write the data to using the documents directory:
NSString *fileName = [NSString stringWithFormat:@"%@/movbandlog.txt",
                      documentsDirectory];
//create content 
NSString *content = @"Data received from devicen n n n nData sent to Portaln n n n nData received to Portal";
//save to documents directory
[content writeToFile:fileName
          atomically:NO
            encoding:NSStringEncodingConversionAllowLossy
               error:nil];
}

Answer 1

纯可可

使用NSDate和可选的NSDateFormatter来格式化:

NSDate *currentDate = [NSDate date];
NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateFormat:@"dd.MM.YY HH:mm:ss"];
NSString *dateString = [dateFormatter stringFromDate:currentDate];
// NSLog(@"%@",dateString);
// Adding your dateString to your content string
NSString *content = [NSString stringWithFormat:@"Data received from devicen n n n nData sent to Portaln n n n nData received to Portaln n n n nData received at %@", dateString];

使用Unix函数

您还可以考虑使用unix函数来处理未本地化的日期(时间戳)

struct tm  sometime;
const char *formatString = "%Y-%m-%d %H:%M:%S %z";
(void) strptime_l("2005-07-01 12:00:00 -0700", formatString, &sometime, NULL);
NSLog(@"NSDate is %@", [NSDate dateWithTimeIntervalSince1970: mktime(&sometime)]);
// Output: NSDate is 2005-07-01 12:00:00 -0700