单例传值
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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
#import "Singleton.h"
@implementation Singleton
static Singleton * singleton = nil;
+ (Singleton *)shareSingleton
{
@synchronized(self){
if (singleton == nil) {
singleton = [[Singleton alloc]init];
}
}
return singleton;
}
#import "FirstViewController.h"
#import "SecondViewController.h"
#import "UIButton+Create.h"
#import "Singleton.h"
@interface FirstViewController ()
UITextField * _textField;//创建一个输入框
@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.
#import "SecondViewController.h"
@interface SecondViewController ()
@implementation SecondViewController
[_label release];
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];