IOS学习之——ViewController之间正向传值

//
//  OneViewController.m
//  双向传值
//
//  Created by spare on 16/4/16.
//  Copyright © 2016年 spare. All rights reserved.
//

#import "OneViewController.h"
#import "TwoViewController.h"

@interface OneViewController ()
@property (weak, nonatomic) IBOutlet UITextField *textField1;

@end

@implementation OneViewController

//点击屏幕任意位置，进入页面2
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
//初始化将要进入的页面
TwoViewController *vc2=[[TwoViewController alloc]init];
//通过页面2定义的Content属性，将值传给页面2
vc2.content=self.textField1.text;
[self presentViewController:vc2 animated:YES completion:nil];

}

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view from its nib.
}

- (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

#import <UIKit/UIKit.h>

@interface TwoViewController : UIViewController

//页面1的对象不能直接访问页面2的textField属性
//需要定义一个中间的变量值，将页面一的值保存在中间变量中
@property(nonatomic,copy)NSString *content;

@end

//
//  TwoViewController.m
//  双向传值
//
//  Created by spare on 16/4/16.
//  Copyright © 2016年 spare. All rights reserved.
//

#import "TwoViewController.h"

@interface TwoViewController ()

@property (weak, nonatomic) IBOutlet UITextField *textField2;

@end

@implementation TwoViewController

- (void)viewDidLoad {
[super viewDidLoad];

}

//每次进入页面的时候，都去刷新获得的值
-(void)viewWillAppear:(BOOL)animated{
//通过中间属性，传值给textField2；
self.textField2.text=self.content;
}

- (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