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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