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：

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：

——————————————————————————

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：

———————————————————————————

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：

————————————————————————————

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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