UIPassValue页面传值 UI_08(下)

2、从前一个界面到后一个界面
注意:解题思路
 葵花宝典:属性传值
 第一步:在下一个界面视图控制器的.h文件中定义一个属性
 第二步:在push之前将数据存储到属性中
 第三步:取出属性中的值让控件显示
 从后一个界面往前一个界面传值
 辟邪剑谱:代理传值
代理传值示意图:

UIPassValue页面传值 UI_08(下)


注意:从后一个页面往前不相邻的一个界面传值用单例
——————————————————————————————
AppDelegate.m
 //创建根视图控制器firstVC
   
FirstViewController *firstVC = [[FirstViewController alloc]init];
   
//创建导航控制器
   
UINavigationController *navigationController = [[UINavigationController alloc]initWithRootViewController:firstVC];
   
self.window.rootViewController = navigationController;
    [firstVC
release];
    [navigationController release];
———————————————————————————————
FirstViewController.m
#warning 代理传值第四步 代理对象所在的类遵循协议
@interface FirstViewController ()<</span>SecondViewControllerDelegate>
@end
@implementation
FirstViewController
- (void)passValue:(NSString *)string{
#warning 代理传值第五步  实现协议中的方法
    ((UILabel *)[self.view viewWithTag:202]).text = string;
}
- (void)viewWillDisappear:(BOOL)animated{
    ((
UILabel *)[self.view viewWithTag:202]).text = [SingleLeton__ shareSingleLeton].string;
}
- (
void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor cyanColor];
    //建立一个label
   
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(30, 84, 260, 40)];
    label.
tag = 202;
    label.
backgroundColor = [UIColor whiteColor];
    label.
text = @"你爱她吗?";
    label.textColor = [UIColor redColor];
    #warning 单例传值第五步   取出单例中属性中存储的数据,赋值给空间
    label.text = [SingleLeton__ shareSingleLeton].string;
    [self.view addSubview:label];
    [label release];
    //建立一个textField
   
UITextField *field = [[UITextField alloc]initWithFrame:CGRectMake(30, 164, 260, 40)];
   
//第三步加tag值
    field.
tag = 200;
    field.
borderStyle = UITextBorderStyleRoundedRect;
    field.
placeholder = @"请输入内容";
    field.
textColor = [UIColor redColor];
    [
self.view addSubview:field];
    [field release];

  //建立一个button
    UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.
frame = CGRectMake(30, 244, 260, 40);
    [button
setTitle:@"进入下一页" forState:UIControlStateNormal];
    button.
tintColor = [UIColor redColor];
    button.
backgroundColor = [UIColor grayColor];
    [button
addTarget:self action:@selector(handlePassValue : ) forControlEvents:(UIControlEventTouchUpInside)];
    [
self.view addSubview:button];

    [
self configureCommonProerty];
   
self.navigationController.navigationBar.tintColor = [UIColor redColor];
   
}
#pragma mark 公共方法
- (void)configureCommonProerty{
   
//设置导航条背景图片
    [
self.navigationController.navigationBar setBackgroundImage:[UIImage imageNamed:@"1"] forBarMetrics:UIBarMetricsDefault];
}

- (
void)handlePassValue : (UIButton *)passValue{
   
//此时创建的是下一个界面对象
   
SecondViewController *second = [[SecondViewController alloc]init];
#warning 代理传值第三步 为后一个界面指定代理对象,只能是前一个页面试图控制器对象
    second.delegate = self;
#warning 属性传值第二步 push之前传入数据
    second.testString  = ((UITextField *)[self.view viewWithTag:200]).text;

    [self.navigationController pushViewController:second animated:YES];
    [second
release];
}
- (
void)customNavigationItemAppearance{
   
//配置导航条显示的标题
   
self.navigationItem.title = @"第一页";
}
代理传值效果:
UIPassValue页面传值&amp;nbsp;UI_08(下)


——————————————————————————
SecondViewController.h

#warning 代理传值第一步 定义协议
@protocol SecondViewControllerDelegate <</span>NSObject>
- (
void)passValue : (NSString *)string;
@end
@interface SecondViewController : UIViewController
#warning 属性传值第一步  定义属性且属性的类型要和要传入的数据类型要保持一致
@property(nonatomic,copy)NSString *testString;
#warning 代理传值第二步 定义代理属性
@property(nonatomic,assign)id<</span>SecondViewControllerDelegate>delegate;
@end
属性传值效果:
UIPassValue页面传值&amp;nbsp;UI_08(下)

———————————————————————————
SecondViewController.m
//建立一个label
   
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(30, 84, 260, 40)];
    label.
backgroundColor = [UIColor whiteColor];
    label.
text = @"给我下一页的内容";
#warning 属性传值的第三步  取出数据让控件显示
   label.text = self.testString;
   
    label.
textColor = [UIColor redColor];
    [
self.view addSubview:label];
    [label
release];
   
   
//建立一个textField
   
UITextField *field = [[UITextField alloc]initWithFrame:CGRectMake(30, 164, 260, 40)];
    field.
tag = 203;
    field.
borderStyle = UITextBorderStyleRoundedRect;
    field.
placeholder = @"请输入第二页的内容";
    field.
textColor = [UIColor redColor];
    [
self.view addSubview:field];
    [field
release];
   
   
//建立一个button
   
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.
frame = CGRectMake(30, 244, 260, 40);
    [button
setTitle:@"进入下一页" forState:UIControlStateNormal];
    button.
tintColor = [UIColor redColor];
    button.
backgroundColor = [UIColor grayColor];
    [button
addTarget:self action:@selector(handlePassValue :) forControlEvents:(UIControlEventTouchUpInside)];
    [
self.view addSubview:button];

   
   
//建立一个button
   
UIButton *button1 = [UIButton buttonWithType:UIButtonTypeCustom];
    button1.
frame = CGRectMake(30, 324, 260, 40);
    [button1
setTitle:@"返回上一页" forState:UIControlStateNormal];
    button1.
tintColor = [UIColor redColor];
    button1.
backgroundColor = [UIColor grayColor];
    [button1
addTarget:self action:@selector(handlePass :) forControlEvents:(UIControlEventTouchUpInside)];
    [
self.view addSubview:button1];
    
self.navigationItem.title = @"第二页";
}

- (
void)handlePassValue : (UIButton *)passValue{
   
ThirdViewController *third = [[ThirdViewController alloc]init];
   
//传值第三不创建时赋值
    third.textString = ((UITextField *)[self.view viewWithTag:203]).text;
    [self.navigationController pushViewController:third animated:YES];
    [third
release];
}
- (void)handlePass : (UIButton *)pass{  
#warning 代理传值第六步 让代理执行协议中的方法
    NSString *string = ((UITextField *)[self.view viewWithTag: 203]).text;
   if ([self.delegate respondsToSelector:@selector(passValue:)]) {
        [self.delegate passValue:string];
    }
    [
self.navigationController popViewControllerAnimated:YES];
}
——————————————————————————
ThirdViewController.h
@property(nonatomic,copy)NSString *textString;
ThirdViewController.m
self.view.backgroundColor = [UIColor greenColor];
   
//建立一个label
   
UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(30, 84, 260, 40)];
    label.
backgroundColor = [UIColor grayColor];
  label.
text = @"给我第一个页面的内容";
    label.
text = self.textString;
    [
self.view addSubview:label];
    [label
release];
   
   
//建立一个textField
   
UITextField *field = [[UITextField alloc]initWithFrame:CGRectMake(30, 164, 260, 40)];
    field.
borderStyle = UITextBorderStyleRoundedRect;
    field.
textColor = [UIColor redColor];
    field.
placeholder = @"啦啦啦";
    field.
tag = 204;
    [
self.view addSubview:field];
    [field
release];
   
   
//建立一个button
   
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
    button.
frame = CGRectMake(30, 244, 260, 40);
    [button
setTitle:@"返回" forState:UIControlStateNormal];
    button.
tintColor = [UIColor redColor];
    button.
backgroundColor = [UIColor grayColor];
    [button
addTarget:self action:@selector(handlePassValue :) forControlEvents:(UIControlEventTouchUpInside)];
    [
self.view addSubview:button];
    
self.navigationItem.title = @"第三页";
}
- (
void)handlePassValue : (UIButton *)passValue{
#warning 单例传值第四步  给单例对象的属性赋值
[SingleLeton__ shareSingleLeton].string  =  ((UITextField *)[self.view viewWithTag:204]).text;
    [
self.navigationController popToRootViewControllerAnimated:YES];
}
————————————————————————————
SingleLeton单例.h
#warning 单例传值第一步 ,定义单例类,继承自NSObject
#import

@interface SingleLeton__ : NSObject
#warning 单例传值第二步 定义单例类的创建的方法
//share stand main   创建单例对象方法常用的开头
+ (
SingleLeton__
*)shareSingleLeton;
#warning 单例传值第三步  定义属性,存储传输的数据,属性的类型要和传输数据的类型保持一致
@property(nonatomic,copy)NSString *string;
@end
单例传值效果:
UIPassValue页面传值&amp;nbsp;UI_08(下)

————————————————————————————
SingleLeton单例.m
//定义一个有static 修饰的SingleLeton对象
//static 修饰的变量的生命周期和应用程序的生命周期一样长,只有程序退出后台的时候才被销毁
static SingleLeton__ *single = nil;
+ (
SingleLeton__ *)shareSingleLeton{
   
//single等于nil还没被初始化,所以在if语句对其初始化
   
//实时同步单例对象的创建,保护其在多线程下的安全

   
@synchronized(self){
   
if (single == nil) {
       
single = [[SingleLeton__ alloc]init
];
    }
}
   
return single;
}
- (
void)dealloc{
   
self.string = nil;
    [
super dealloc];
}
================================================
导航控制器——UI-第八天(上)http://blog.sina.com.cn/s/blog_814ecfa90102vvzu.html

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