数据的存储（2）

来源：互联网发布：java web 菜鸟教程编辑：程序博客网时间：2024/05/07 22:56

// writeDate.m

// NSFileManager

// Created by 王丽丽 on 14-2-17.

#import "writeDate.h"

@implementation writeDate

- (void)runDate

{

//创建一个新的文件路径

NSFileManager *fileManeger = [NSFileManagerdefaultManager];

NSString *path = NSHomeDirectory();

//给文件命名

NSString *filePath = [path stringByAppendingString:@"/date.text"];

//在给定路径上创建一个文件判断是不是创建成功

BOOL success = [fileManeger createFileAtPath:filePath contents:nilattributes:nil];

if (success)

{

NSLog(@"creat success");

}

//存储文件

NSFileHandle *fileHandle = [NSFileHandlefileHandleForWritingAtPath:filePath];

//计时管理器每一秒钟执行timeAction:一次将参数设置为 fileHandle

[NSTimerscheduledTimerWithTimeInterval:1target:selfselector:@selector(timeAction:)userInfo:fileHandle repeats:YES];

}

- (void)timeAction:(NSTimer *)timer

{

//创建一个静态变量用于累计次数

static int n =0;

NSFileHandle *fileHandle = timer.userInfo;

//读取到文件末尾

[fileHandleseekToEndOfFile];

//获取当前时间

NSDate *nowDate = [NSDatedate];

//设计时间的格式

NSDateFormatter *dateFormatter = [[NSDateFormatteralloc]init];

[dateFormattersetDateFormat:@"yyyy/MM/dd HH:mm:ss"];

NSString *dateStr = [dateFormatter stringFromDate:nowDate];

dateStr = [dateStrstringByAppendingString:@"\n"];

NSData *data = [dateStrdataUsingEncoding:NSUTF8StringEncoding];

[fileHandlewriteData:data];

if (n == 10) {

[timerinvalidate];

[fileHandlecloseFile];

}

@end

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