单例传值

单例传值 ------- 如果页面之间相隔很多,要进行传值,将值保存到第三方,将第三方设置为单例模式

代码如下:

<pre name="code" class="objc">#import <Foundation/Foundation.h>@interface Singleton : NSObject+ (Singleton *)shareSingleton;@property (nonatomic,copy)NSString * text;@end

#import "Singleton.h"@implementation Singletonstatic Singleton * singleton = nil;+ (Singleton *)shareSingleton{    @synchronized(self){        if (singleton == nil) {            singleton = [[Singleton alloc]init];        }    }    return singleton;}@end

#import "FirstViewController.h"#import "SecondViewController.h"#import "UIButton+Create.h"#import "Singleton.h"@interface FirstViewController (){    UITextField * _textField;//创建一个输入框}@end@implementation FirstViewController- (void)dealloc{    [_textField release];    [super dealloc];}- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];            self.view.backgroundColor = [UIColor redColor];    self.navigationItem.title = @"首页";    /**     *  1.在第一个界面创建一个输入框     *       */    _textField = [[UITextField alloc]initWithFrame:CGRectMake(50, 80, 200, 30)];    _textField.borderStyle = UITextBorderStyleRoundedRect;    [self.view addSubview:_textField];            /**     *  1.创建一个UIButton,     *  2.并添加响应事件,从首页跳转到第二个页面.     */    UIButton * button = [UIButton systemButtonWithFrame:CGRectMake(100, 120, 50, 50) title:@"Push" target:self action:@selector(didClickButtonAction)];    [self.view addSubview:button];        // Do any additional setup after loading the view.}- (void)didClickButtonAction{        /**     *  1.用push的方法推出下一个页面     *  2.把首页输入框输入的字符串,通过单例来接收     *  3.从而实现把首页输入框输入的字符串,传到第二页的UILabel上.     */    SecondViewController * secondVC = [[SecondViewController alloc]init];    [Singleton shareSingleton].text = _textField.text;    [self.navigationController pushViewController:secondVC animated:YES];    [secondVC release];}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end

#import "SecondViewController.h"#import "Singleton.h"@interface SecondViewController ()@end@implementation SecondViewController- (void)dealloc{    [_label release];    [super dealloc];}- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];    if (self) {        // Custom initialization    }    return self;}- (void)viewDidLoad{    [super viewDidLoad];    self.view.backgroundColor = [UIColor orangeColor];    self.navigationItem.title = @"第二页";    /**     *  1.在第二个界面创建一个UILabel     *  2.把首页输入框输入的字符串,通过单例类的属性NSString * text接收     *  3.然后通过赋值给UILabel     */    _label = [[UILabel alloc]initWithFrame:CGRectMake(50, 80, 200, 30)];    _label.backgroundColor = [UIColor greenColor];        _label.text = [Singleton shareSingleton].text;        [self.view addSubview:_label];    // Do any additional setup after loading the view.}- (void)didReceiveMemoryWarning{    [super didReceiveMemoryWarning];    // Dispose of any resources that can be recreated.}@end