页面之间的普通传值和反向传值

页面之间的数据传递是最基本的，下面就ios页面之间的数据传递需要理解的知识点整理一下

1，了解委托代理

2，协议的定义和实现（java的接口，Android的页面跳转使用的是Intent 所以不需要使用接口）

3，定义空白的window等（本人觉得最难的是按照网上的方法创建工程时，有一些方法找不到，建议在这一块找一个做ios开的人员指导一下）

一：普通数据传递  （ViewController页面输入框的值传到ViewController2页面并显示在输入框中）

a,定义ViewController和ViewController2页面并添加数据框和按钮

b,添加按钮的点击事件

c,将数据通过属传递到ViewController2页面

代码实现如下：

//
//  ViewController.h
//  test1114
//
//  Created by wang on 15/11/14.
//  Copyright © 2015年 wang. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController

@end

 ViewController.m

//
//  ViewController.m
//  test1114
//
//  Created by wang on 15/11/14.
//  Copyright © 2015年 wang. All rights reserved.
//

#import "ViewController.h"
#import "ViewController2.h"

@interface ViewController ()

@property UITextField*  tf1;
@property UITextField* tf2;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor=[UIColor yellowColor];
self.navigationItem.title=@"第一个界面";
//姓名输入框
_tf1= [[UITextField alloc]init];
_tf1.frame=CGRectMake(100, 100, 200, 30);
//设置边框
_tf1.borderStyle=UITextBorderStyleRoundedRect;
//设置输入框的背景颜色
_tf1.backgroundColor=[UIColor whiteColor];
// 设置提示语
_tf1.placeholder=@"请输入姓名";
[self.view addSubview:_tf1];
[_tf1 release];

//创建button
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
//butto的大小
btn.frame = CGRectMake(20, 100, 100, 300);
//标题
[btn setTitle:@"next" forState:UIControlStateNormal];

//跳转
[btn addTarget:self action:@selector(nextA) forControlEvents:UIControlEventTouchUpInside];
//添加到view视图中
[self.view addSubview:btn];

// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

//点击事件
- (void)nextA
{
ViewController2 *viewCtr = [[ViewController2 alloc] init];

viewCtr.userNameTitle=_tf1.text;//将输入框的值传递到第二个界面
[self.navigationController pushViewController:viewCtr animated:YES];
[viewCtr release];
}

@end

第二个页面

//
//  ViewController2.h
//  test1114
//
//  Created by wang on 15/11/15.
//  Copyright © 2015年 wang. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController2 : UIViewController

@property(nonatomic,copy) NSString* userNameTitle;

@end

 .m文件

//
//  ViewController2.m
//  test1114
//
//  Created by wang on 15/11/15.
//  Copyright © 2015年 wang. All rights reserved.
//

#import "ViewController2.h"
#import "ViewController3.h"

@interface ViewController2 ()

@property UITextField* tf1;

@end

@implementation ViewController2

@synthesize userNameTitle=_userNameTitle;

- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];

self.navigationItem.title=@"第二个页面";

//姓名输入框
_tf1= [[UITextField alloc]init];
_tf1.frame=CGRectMake(100, 100, 200, 30);
//设置边框
_tf1.borderStyle=UITextBorderStyleRoundedRect;
//设置输入框的背景颜色
_tf1.backgroundColor=[UIColor whiteColor];
// 设置提示语
_tf1.placeholder=@"请输入姓名";

_tf1.text=_userNameTitle;

[self.view addSubview:_tf1];
[_tf1 release];

UIButton* btn= [UIButton buttonWithType:UIButtonTypeRoundedRect];

btn.frame=CGRectMake(10, 200, 300, 200);

[btn setTitle:@"跳转到第一个页面" forState:UIControlStateNormal];

[btn addTarget:self action:@selector(ShowNext) forControlEvents:(UIControlEventTouchUpInside)];

[self.view addSubview:btn];

// Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/

-(void)ShowNext{

//点击按钮返回到上一个界面，并将输入框的参数带到上一个界面

NSString* btn=_tf1.text;
NSLog(@"%@",_tf1.text);

//设置视图出栈
[self.navigationController popViewControllerAnimated:YES];

//    ViewController3 * vc3 = [[ViewController3 alloc]init];
//
//    [self.navigationController pushViewController:vc3 animated:YES];
//
//    [vc3 release];
}

@end

2，第二页面输入框的值传递到第一个页面

//
//  ViewController.h
//  test1114
//
//  Created by wang on 15/11/14.
//  Copyright © 2015年 wang. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "ViewController2.h"

/**
实现代理，接收ViewController2代理传过来的值
*/
@interface ViewController : UIViewController<IntentFrist>

@end

//
//  ViewController.m
//  test1114
//
//  Created by wang on 15/11/14.
//  Copyright © 2015年 wang. All rights reserved.
//

#import "ViewController.h"
#import "ViewController2.h"

@interface ViewController ()

@property UITextField*  tf1;
@property UITextField* tf2;

@end

@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor=[UIColor yellowColor];
self.navigationItem.title=@"第一个界面";
//姓名输入框
_tf1= [[UITextField alloc]init];
_tf1.frame=CGRectMake(100, 100, 200, 30);
//设置边框
_tf1.borderStyle=UITextBorderStyleRoundedRect;
//设置输入框的背景颜色
_tf1.backgroundColor=[UIColor whiteColor];
// 设置提示语
_tf1.placeholder=@"请输入姓名";
[self.view addSubview:_tf1];
[_tf1 release];

//创建button
UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
//butto的大小
btn.frame = CGRectMake(20, 100, 100, 300);
//标题
[btn setTitle:@"next" forState:UIControlStateNormal];

/
4000
/跳转
[btn addTarget:self action:@selector(nextA) forControlEvents:UIControlEventTouchUpInside];
//添加到view视图中
[self.view addSubview:btn];

// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

//点击事件
- (void)nextA
{
ViewController2 *viewCtr = [[ViewController2 alloc] init];

viewCtr.userNameTitle=_tf1.text;//将输入框的值传递到第二个界面
viewCtr.delegate=self;
[self.navigationController pushViewController:viewCtr animated:YES];
[viewCtr release];
}

#pragma mark -实现协议，并接收传值
-(void)getUserNameTitle:(NSString *)userNameTitle{

NSLog(@"%@",userNameTitle);
_tf1.text=userNameTitle;

}

@end

第二个页面

//
//  ViewController2.h
//  test1114
//
//  Created by wang on 15/11/15.
//  Copyright © 2015年 wang. All rights reserved.
//

#import <UIKit/UIKit.h>

/**
使用协议代理传值
*/

@protocol IntentFrist <NSObject>

-(void)getUserNameTitle:(NSString*) userNameTitle;

@end

@interface ViewController2 : UIViewController
//类实现委托代理

@property(nonatomic,assign)id<IntentFrist> delegate;//实现代理

@property(nonatomic,copy) NSString* userNameTitle;

@end

//
//  ViewController2.m
//  test1114
//
//  Created by wang on 15/11/15.
//  Copyright © 2015年 wang. All rights reserved.
//

#import "ViewController2.h"
#import "ViewController3.h"

@interface ViewController2 ()

@property UITextField* tf1;

@end

@implementation ViewController2

@synthesize userNameTitle=_userNameTitle;
@synthesize  delegate=_delegate;

- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];

self.navigationItem.title=@"第二个页面";

//姓名输入框
_tf1= [[UITextField alloc]init];
_tf1.frame=CGRectMake(100, 100, 200, 30);
//设置边框
_tf1.borderStyle=UITextBorderStyleRoundedRect;
//设置输入框的背景颜色
_tf1.backgroundColor=[UIColor whiteColor];
// 设置提示语
_tf1.placeholder=@"请输入姓名";

_tf1.text=_userNameTitle;

[self.view addSubview:_tf1];
[_tf1 release];

UIButton* btn= [UIButton buttonWithType:UIButtonTypeRoundedRect];

btn.frame=CGRectMake(10, 200, 300, 200);

[btn setTitle:@"跳转到最后一个页面" forState:UIControlStateNormal];

[btn addTarget:self action:@selector(ShowNext) forControlEvents:(UIControlEventTouchUpInside)];

[self.view addSubview:btn];

// Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

/*
#pragma mark - Navigation

// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/

-(void)ShowNext{

//点击按钮返回到上一个界面，并将输入框的参数带到上一个界面

NSString* btn=_tf1.text;
NSLog(@"%@",_tf1.text);
//    if ([_delegate respondsToSelector:@selector(nextA:)]) {
[_delegate getUserNameTitle:_tf1.text];
//    }

//设置视图出栈
[self.navigationController popViewControllerAnimated:YES];

//    ViewController3 * vc3 = [[ViewController3 alloc]init];
//
//    [self.navigationController pushViewController:vc3 animated:YES];
//
//    [vc3 release];
}

@end

解释：第二个页面的数据传递到第一个页面，

1），先讲第二个页面的值放到协议中        [_delegate getUserNameTitle:_tf1.text];

2），第一个页面实现协议并接收数据   

#pragma mark -实现协议，并接收传值

-(void)getUserNameTitle:(NSString *)userNameTitle{

    NSLog(@"%@",userNameTitle);

    _tf1.text=userNameTitle;

}

android页面之间的数据传递；

布局就一个输入框和按钮

第一个页面

package com2.example.wang.myapplication;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.View;
import android.view.Menu;
import android.view.MenuItem;
import android.widget.EditText;

public class MainActivity extends AppCompatActivity {

private EditText input_text;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});

//初始化输入框
input_text= (EditText)findViewById(R.id.index_et);
}

/**
* 按钮点击事件
* @param view
*/
public void show(View view){
switch (view.getId()){
case R.id.index_btn:
//获得输入框的值，将值传到下一页
startActivity(new Intent(MainActivity.this,Main2Activity.class).putExtra("userNameTitle",input_text.getText().toString().trim()));

break;
case R.id.index_btn2:
//获得输入框的值，将值传到下一页
Intent intent =new Intent();
intent.setClass(MainActivity.this,Main2Activity.class);
intent.putExtra("userNameTitle",input_text.getText().toString().trim());
startActivityForResult(intent, 2);

break;
default:
break;
}
}

/**
* 获得第二个界面传递的值
* @param requestCode
* @param resultCode
* @param data
*/
@Override
protected void onActivityResult(int requestCode, int resultCode, Intent data) {

if(resultCode==RESULT_OK&&requestCode==2){

input_text.setText(data.getStringExtra("userNameTitle"));
}

super.onActivityResult(requestCode, resultCode, data);
}

/**
*
* @param menu
* @return
*/

@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}

@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();

//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}

return super.onOptionsItemSelected(item);
}
}

第二个页面

package com2.example.wang.myapplication;

import android.content.Intent;
import android.os.Bundle;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.view.KeyEvent;
import android.view.View;
import android.widget.EditText;

public class Main2Activity extends AppCompatActivity {

private EditText inputText;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main2);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);

FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
//初始化组件
inputText= (EditText)findViewById(R.id.et);

//将传递的值设置到输入框中
inputText.setText(getIntent().getStringExtra("userNameTitle"));
}

/**
* 按钮点击事件
* @param view
*/
public void show(View view){
switch (view.getId()){

case R.id.btn:
//获得输入框的值，将值传到下一页
Intent intent =new Intent();
//                intent.setClass(Main2Activity.this, MainActivity.class);
intent.putExtra("userNameTitle", inputText.getText().toString().trim());
setResult(RESULT_OK,intent);
finish();
break;
default:
break;
}
}

}

android的跳转是通过Intent实现的，数据也可以直接放在Intent对象中传递

反向传值：

1，startActivityForResult

2，实现onActivityResult

3，第二个页面使用setResult带返回值跳转

4,综上 还是Android实现简单