UIPassValue页面传值&nbsp;UI_08（下）-阿里云开发者社区

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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