//
// ViewController.m
// UI04_界面之间的通信
//
// Created by lanou3g on 17/8/8.
// Copyright © 2017年 lanou3g. All rights reserved.
//
#import "ViewController.h"
#import "SecondViewController.h"
//遵守协议
@interface ViewController ()<SecondViewControllerDelegate>
@property (nonatomic, retain) UITextField *textField;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor whiteColor];
self.textField = [[UITextField alloc] initWithFrame:CGRectMake(100, 100, 200, 40)];
self.textField.placeholder = @"请输入内容";
[self.view addSubview:self.textField];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake(100, 200, 100, 100);
button.backgroundColor = [UIColor orangeColor];
[button setTitle:@"下一页" forState:UIControlStateNormal];
[button addTarget:self action:@selector(buttonAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];
}
- (void)buttonAction:(UIButton *)button {
SecondViewController *secondViewController = [[SecondViewController alloc] init];
//建立代理关系 (属性传值)
secondViewController.delegate = self;
secondViewController.text = self.textField.text;
[self presentViewController:secondViewController animated:YES completion:nil];
}
//实现协议方法
- (void)gettextFieldValue:(NSString *)text {
//传过来的text,给本页中的text
self.textField.text = text;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
//
// SecondViewController.h
// UI04_界面之间的通信
//
// Created by lanou3g on 17/8/8.
// Copyright © 2017年 lanou3g. All rights reserved.
//
#import <UIKit/UIKit.h>
//委托方制定协议，代理人必须遵守
//协议
@protocol SecondViewControllerDelegate <NSObject>
- (void)gettextFieldValue:(NSString *)text;
@end
@interface SecondViewController : UIViewController
//给label显示
@property (nonatomic, retain) NSString *text;
//代理的属性 //用来设置代理，并且遵守协议
@property (nonatomic, assign) id<SecondViewControllerDelegate>delegate;
@end
//
// SecondViewController.m
// UI04_界面之间的通信
//
// Created by lanou3g on 17/8/8.
// Copyright © 2017年 lanou3g. All rights reserved.
//
#import "SecondViewController.h"
@interface SecondViewController ()
@property (nonatomic, retain) UITextField *textField2;
@end
@implementation SecondViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.view.backgroundColor = [UIColor yellowColor];
UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 100, 40)];
label.backgroundColor = [UIColor redColor];
label.text = self.text;
[self.view addSubview:label];
self.textField2 = [[UITextField alloc] initWithFrame:CGRectMake(100, 200, 100, 50)];
self.textField2.placeholder = @"请输入内容:";
[self.view addSubview:self.textField2];
UIButton *backButtton = [UIButton buttonWithType:UIButtonTypeCustom];
backButtton.frame = CGRectMake(100, 300, 100, 100);
backButtton.backgroundColor = [UIColor greenColor];
[backButtton setTitle:@"上一页" forState:UIControlStateNormal];
[backButtton addTarget:self action:@selector(backButttonAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:backButtton];
}
- (void)backButttonAction:(UIButton *)buttton {
//利用代理去回传数据
[self.delegate gettextFieldValue:self.textField2.text];
[self dismissViewControllerAnimated:YES completion:nil];
}
- (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.
}
*/
@end
