單例傳值

標籤：singleton   控制項   iphone   導航   介面   

單例傳值 ------- 如果頁面之間相隔很多,要進行傳值,將值儲存到第三方,將第三方設定為單例模式

代碼如下:

<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;//建立一個輸入框}@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 = @"首頁";    /**     *  1.在第一個介面建立一個輸入框     *       */    _textField = [[UITextField alloc]initWithFrame:CGRectMake(50, 80, 200, 30)];    _textField.borderStyle = UITextBorderStyleRoundedRect;    [self.view addSubview:_textField];            /**     *  1.建立一個UIButton,     *  2.並添加響應事件,從首頁跳轉到第二個頁面.     */    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的方法推出下一個頁面     *  2.把首頁輸入框輸入的字串,通過單例來接收     *  3.從而實現把首頁輸入框輸入的字串,傳到第二頁的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 = @"第二頁";    /**     *  1.在第二個介面建立一個UILabel     *  2.把首頁輸入框輸入的字串,通過單例類的屬性NSString * text接收     *  3.然後通過賦值給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

單例傳值