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  • 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
    
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  • 原文地址:https://www.cnblogs.com/0515offer/p/4638879.html
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