UI2_NSUserDefaults

//
// ViewController.m
// UI2_NSUserDefaults
//
// Created by zhangxueming on 15/7/8.
// Copyright (c) 2015年 zhangxueming. All rights reserved.
//#import "ViewController.h"@interface ViewController ()@end@implementation ViewController- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib. NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
NSString *textString = [defaults objectForKey:@"key"];
if (textString) {
NSLog(@"textString = %@",textString);
}
else
{
NSLog(@"程序第一次启动");
} UIButton *writeBtn = [UIButton buttonWithType:UIButtonTypeSystem];
writeBtn.frame = CGRectMake(100, 100, self.view.frame.size.width-200, 50);
[writeBtn setTitle:@"写入数据" forState:UIControlStateNormal];
[writeBtn addTarget:self action:@selector(writeBtnClicked) forControlEvents:UIControlEventTouchUpInside]; [self.view addSubview:writeBtn]; UIButton *deleteBtn = [UIButton buttonWithType:UIButtonTypeSystem];
deleteBtn.frame = CGRectMake(100, 200, self.view.frame.size.width-200, 50);
[deleteBtn setTitle:@"删除数据" forState:UIControlStateNormal];
[deleteBtn addTarget:self action:@selector(deleteBtnClicked) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:deleteBtn];
}- (void)writeBtnClicked
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults setObject:@"千锋教育" forKey:@"key"];
[defaults synchronize];
}- (void)deleteBtnClicked
{
NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
[defaults removeObjectForKey:@"key"];
[defaults synchronize];
}- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}@end