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

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