2、从前一个界面到后一个界面
注意：解题思路
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
———————————————————————————————
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
@interface FirstViewController ()<</span>SecondViewControllerDele
@end
@implementation
FirstViewController
- (void)passValue:(NSString *)string{
#warning 代理传值第五步 实现协议中的方法
#warning 代理传值第五步
}
- (void)viewWillDisappear:(BOOL)animated{
(( UILabel *)[self.view viewWithTag:202]).text = [SingleLeton__ shareSingleLeton].string;
}
- (void)viewDidLoad {
}
- (void)viewDidLoad {
}
- (void)configureCommonProerty{
}
- (void)handlePassValue : (UIButton *)passValue{
#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
#warning 属性传值第二步 push之前传入数据
}
- (void)customNavigationItemAppe
}
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
@protocol SecondViewControllerDele
- (void)passValue : (NSString *)string;
@end
@interface SecondViewController : UIViewController
#warning 属性传值第一步
@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;
@property(nonatomic,assign)id<</span>SecondViewControllerDele
@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
#warning 属性传值的第三步
}
- (void)handlePassValue : (UIButton *)passValue{
}
- (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;
}
——————————————————————————
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];
}
- (void)handlePassValue : (UIButton *)passValue{
#warning 单例传值第四步
[SingleLeton__ shareSingleLeton].string
}
————————————————————————————
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;
#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
+ (SingleLeton__ *)shareSingleLeton;
#warning 单例传值第三步
@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];
//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{
}
}
- (void)dealloc{
}
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导航控制器——UI-第八天（上）：
http://blog.sina.com.cn/s/blog_814ecfa90102vvzu.html
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