控制器之间的数据传递——NSUserDefaults传值

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NSUserDefaults传值

使用偏好设置(NSUserDefaults)传值实质是一个控制器把数据持久化于沙盒，另一个控制器再从沙盒读取对应的文件获取数据，它是一种以文件进行传值的方式。

一. 实现步骤

在界面2中，声明NSUserDefaults变量，并往NSUserDefaults对象中添加要传递的数据
在界面1中，声明NSUserDefaults变量，通过对应的健取出对应的数据

二. 具体代码

1. AppDelegate类

---------- AppDelegate.m文件#import "AppDelegate.h"#include "OneViewController.h"@interface AppDelegate ()@end@implementation AppDelegate- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {  // 1. 创建窗口  self.window = [[UIWindow alloc] initWithFrame:[UIScreen mainScreen].bounds];  // 2. 创建窗口的根控制器  // 2.1 创建导航控制器的根控制器  UIViewController *oneVc = [[OneViewController alloc] init];  // 2.2 创建导航控制器  UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:oneVc];  // 2.3 给窗口设置根控制器  self.window.rootViewController = nav;  // 3. 设置窗口为主窗口并显示窗口  [self.window makeKeyAndVisible];  // 隐藏导航控制器的导航条  nav.navigationBarHidden = YES;  return YES;}@end

2. OneViewController类

---------- OneViewController.m文件#import "OneViewController.h"#import "TwoViewController.h"@interface OneViewController ()@property (nonatomic,strong) UITextField *textField;@end@implementation OneViewController- (void)viewDidLoad {  [super viewDidLoad];  //设置控制器View的背景颜色  self.view.backgroundColor = [UIColor greenColor];  // 创建点击按钮  UIButton *clickBtn = [UIButton buttonWithType:UIButtonTypeCustom];  clickBtn.frame = CGRectMake(10, 100, 80, 40);  clickBtn.backgroundColor = [UIColor whiteColor];  [clickBtn setTitle:@"到界面2" forState:UIControlStateNormal];  [clickBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];  [clickBtn setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];  [clickBtn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];  [self.view addSubview:clickBtn];  // 创建文本框  _textField = [[UITextField alloc] initWithFrame:CGRectMake(10, 150, 250, 40)];  _textField.borderStyle = UITextBorderStyleRoundedRect;  _textField.backgroundColor = [UIColor whiteColor];  [self.view addSubview:_textField];}#pragma mark - 点击事件- (void)btnClick {  // 创建界面2，并压入栈  TwoViewController *twoVc = [[TwoViewController alloc] init];  [self.navigationController pushViewController:twoVc animated:YES];}- (void)viewWillAppear:(BOOL)animated {   // 创建NSUserDefaults单例对象，它可以把数据以Plist文件形式存储于沙盒中，也可从沙盒中读取对应的Plist文件  NSUserDefaults *passData = [NSUserDefaults standardUserDefaults];  //获取数据  _textField.text = [passData objectForKey:@"passData"];}@end

3. TwoViewController类

---------- TwoViewController.m文件#import "TwoViewController.h"@interface TwoViewController ()@property (nonatomic,strong) UITextField *textField;@end@implementation TwoViewController- (void)viewDidLoad {    [super viewDidLoad];  //设置控制器View的背景颜色  self.view.backgroundColor = [UIColor yellowColor];  // 创建点击按钮  UIButton *clickBtn = [UIButton buttonWithType:UIButtonTypeCustom];  clickBtn.frame = CGRectMake(10, 100, 80, 40);  clickBtn.backgroundColor = [UIColor whiteColor];  [clickBtn setTitle:@"传 值" forState:UIControlStateNormal];  [clickBtn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];  [clickBtn setTitleColor:[UIColor redColor] forState:UIControlStateHighlighted];  [clickBtn addTarget:self action:@selector(btnClick) forControlEvents:UIControlEventTouchUpInside];  [self.view addSubview:clickBtn];  // 创建文本框  _textField = [[UITextField alloc] initWithFrame:CGRectMake(10, 150, 250, 40)];  _textField.borderStyle = UITextBorderStyleRoundedRect;  _textField.backgroundColor = [UIColor whiteColor];  [self.view addSubview:_textField];}#pragma mark - 点击事件- (void)btnClick {  // 创建NSUserDefaults单例对象，它可以把数据以Plist文件形式存储于沙盒中，也可从沙盒中读取对应的Plist文件  NSUserDefaults *passData = [NSUserDefaults standardUserDefaults];  // 保存数据  [passData setObject:_textField.text forKey:@"passData"];  // 跳转界面  [self.navigationController popViewControllerAnimated:YES];}@end

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