IOS 学习笔记 2015-04-15 控制器数据反向传值

//
//  FirstViewController.h
//  控制器数据传递
//
//  Created by wangtouwang on 15/4/15.
//  Copyright (c) 2015年 wangtouwang. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface FirstViewController : UIViewController

@end

//
//  FirstViewController.m
//  控制器数据传递
//
//  Created by wangtouwang on 15/4/15.
//  Copyright (c) 2015年 wangtouwang. All rights reserved.
//

#import "FirstViewController.h"
#import "TwoViewController.h"

@interface FirstViewController ()<PropagateDelegate>
{
    UILabel *firstLable;
    UITextField *firstField;
    UIButton *firstBtn;
}
@end

@implementation FirstViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor blackColor]];

    firstLable = [[UILabel alloc] initWithFrame:CGRectMake(30, 100, 150, 30)];
    firstLable.text=@"第一页面进出值";
    firstLable.font=[UIFont systemFontOfSize:15.0];
    firstLable.textColor=[UIColor whiteColor];
     [self.view addSubview:firstLable];

    firstField = [[UITextField alloc] initWithFrame:CGRectMake(30, 150, 150, 30)];
    firstField.textColor=[UIColor blackColor];
    firstField.font=[UIFont fontWithName:@"Arial" size:14.0];
    firstField.borderStyle=UITextBorderStyleRoundedRect;
    firstField.placeholder = @"进出值";
    firstField.keyboardType = UIKeyboardTypeDefault;
     [self.view addSubview:firstField];

    firstBtn = [[UIButton alloc] initWithFrame:CGRectMake(30, 210, 150, 30)];
    firstBtn.backgroundColor=[UIColor colorWithRed:195/255.0 green:33/255.0 blue:30/255.0 alpha:1.0];
    [firstBtn setTitle:@"跳转第二页面" forState:UIControlStateNormal];
    [firstBtn.layer setCornerRadius:10.0]; //设置矩形四个圆角半径
    [firstBtn addTarget:self action:@selector(turnTwoPage:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:firstBtn];

}

-(void)turnTwoPage:(UIButton *)btn{
    TwoViewController *two = [[TwoViewController alloc] init];
    two.delegate=self;
    [self.navigationController pushViewController:two animated:NO];
}

-(void)propagateToValue:(NSString *)result{
    NSLog(@"反向传值");
    firstField.text=result;
}

@end

//
//  TwoViewController.h
//  控制器数据传递
//
//  Created by wangtouwang on 15/4/15.
//  Copyright (c) 2015年 wangtouwang. All rights reserved.
//

#import <UIKit/UIKit.h>

@protocol PropagateDelegate <NSObject>

@required
-(void)propagateToValue:(NSString *)result;

@end

@interface TwoViewController : UIViewController

@property(nonatomic,assign) id<PropagateDelegate> delegate;

@end

//
//  TwoViewController.m
//  控制器数据传递
//
//  Created by wangtouwang on 15/4/15.
//  Copyright (c) 2015年 wangtouwang. All rights reserved.
//

#import "TwoViewController.h"

@interface TwoViewController ()

@property(nonatomic,strong) UILabel *firstLable;
@property(nonatomic,strong) UITextField *firstField;
@property(nonatomic,strong) UIButton *firstBtn;

@end

@implementation TwoViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    [self.view setBackgroundColor:[UIColor blackColor]];

    _firstLable = [[UILabel alloc] initWithFrame:CGRectMake(30, 100, 150, 30)];
    _firstLable.text=@"第二页面进出值";
    _firstLable.font=[UIFont systemFontOfSize:15.0];
    _firstLable.textColor=[UIColor whiteColor];
    [self.view addSubview:_firstLable];

    _firstField = [[UITextField alloc] initWithFrame:CGRectMake(30, 150, 150, 30)];
    _firstField.textColor=[UIColor blackColor];
    _firstField.font=[UIFont fontWithName:@"Arial" size:14.0];
    _firstField.borderStyle=UITextBorderStyleRoundedRect;
    _firstField.placeholder = @"进出值";
    _firstField.keyboardType = UIKeyboardTypeDefault;
    [self.view addSubview:_firstField];

    _firstBtn = [[UIButton alloc] initWithFrame:CGRectMake(30, 210, 150, 30)];
    _firstBtn.backgroundColor=[UIColor colorWithRed:195/255.0 green:33/255.0 blue:30/255.0 alpha:1.0];
    [_firstBtn setTitle:@"跳转第一页面" forState:UIControlStateNormal];
    [_firstBtn.layer setCornerRadius:10.0]; //设置矩形四个圆角半径
    [_firstBtn addTarget:self action:@selector(turnFirstPage:) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:_firstBtn];
}

//反向传值
-(void)turnFirstPage:(UIButton *)btn{
    [self.delegate propagateToValue:_firstField.text];
    [self.navigationController popViewControllerAnimated:NO];
}

@end