ios代理模式-(ViewControler之間傳值)

標籤：

1，建立Single View Application工程，建立SecondViewController

2，在SecondViewController中設定代理

　　

#import <UIKit/UIKit.h>@protocol secondViewControllerDelegate <NSObject>- (NSString *)value;@end@interface SecondViewController : UIViewController@property (nonatomic,assign) id <secondViewControllerDelegate> delegate;@end

 

3，在ViewController中添加UIButton，綁定事件，用於跳轉到SecondViewController，在ViewController中添加UITextField，用於輸入需要傳遞的值

4，在ViewController中添加代理協議，設定SecondViewController的代理為ViewController，實現代理方法

代碼如下：

#import "ViewController.h"#import "SecondViewController.h"@interface ViewController () <secondViewControllerDelegate>{    UITextField *_textField;}@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    //添加按鈕    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(20, 200, 300, 40)];    btn.backgroundColor = [UIColor grayColor];    [btn setTitle:@"ToSecondViewController" forState:UIControlStateNormal];    [btn addTarget:self action:@selector(toSecondViewController) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:btn];        //添加textField    _textField = [[UITextField alloc] initWithFrame:CGRectMake(20, 100, 300, 40)];    _textField.backgroundColor = [UIColor yellowColor];    [self.view addSubview:_textField];}- (void)toSecondViewController {    SecondViewController *second = [[SecondViewController alloc] init];    //設定SecondViewController的代理為ViewController自己    second.delegate = self;    [self presentViewController:second animated:YES completion:nil];}

 //實現代理方法

-(NSString *)value {    return _textField.text;}@end

 

5，在SecondViewController中添加UIButton，綁定事件，用於返回到ViewController

6，在SecondViewController中添加UILabel，用於顯示傳遞的值

代碼如下：

#import "SecondViewController.h"@interface SecondViewController ()@end@implementation SecondViewController- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor whiteColor];    // 添加label用於顯示傳遞的值    UILabel *label = [[UILabel alloc] initWithFrame:CGRectMake(20, 100, 300, 40)];    label.text = [_delegate value];    label.backgroundColor = [UIColor greenColor];    [self.view addSubview:label];        //添加按鈕    UIButton *btn = [[UIButton alloc] initWithFrame:CGRectMake(20, 200, 300, 40)];    btn.backgroundColor = [UIColor blueColor];    [btn setTitle:@"ToViewController" forState:UIControlStateNormal];    [btn addTarget:self action:@selector(backFirstViewController) forControlEvents:UIControlEventTouchUpInside];    [self.view addSubview:btn];}- (void)backFirstViewController {    [self dismissViewControllerAnimated:YES completion:nil];}@end

 源碼地址：https://github.com/rokistar/PassValueBetweenViewController

ios代理模式-(ViewControler之間傳值)