自定义委托以获取在tableview单元格上显示的数据

Question

我在ViewController A和tableview上有一个按钮，ViewController B上有自定义单元格。我想在ViewController B的单元格上显示所选数据，作为button上ViewController A的当前标记。我知道这可以通过＆＃34;代表＆＃34;来实现。但我无法为它编码。如果有人告诉我代码，我会非常感激，因为我对iOS开发很新。

提前致谢！

Answer 1

使用此代码：

ViewController.h

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController


@end

ViewController.m

#import "ViewController.h"
#import "SecondViewController.h"

@interface ViewController ()<SecondViewControllerPotocol>
@property (weak, nonatomic) IBOutlet UIButton *sampleButton;

@end

@implementation ViewController

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


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

    SecondViewController *second = (SecondViewController *)[self.storyboard instantiateViewControllerWithIdentifier:@"secondVC"];
    second.delegate = self;
    [self.navigationController presentViewController:second animated:YES completion:nil];
}

- (void)changeButtonTitleWithText:(NSString *)title{

    [self.sampleButton setTitle:title forState:UIControlStateNormal];
}


@end

SecondViewController.h

 #import <UIKit/UIKit.h>

    @protocol SecondViewControllerPotocol <NSObject>

    @optional
    - (void)changeButtonTitleWithText:(NSString *)title;

    @end


    @interface SecondViewController : UIViewController
    //delegate
    @property (nonatomic, assign) id<SecondViewControllerPotocol> delegate;
    @end

SecondViewController.m
----

#import "SecondViewController.h"

@interface SecondViewController ()<UITableViewDelegate, UITableViewDataSource>
@property (weak, nonatomic) IBOutlet UITableView *colorsTableView;
@property (strong, nonatomic) NSArray *colorsArray;

@end

@implementation SecondViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    [self.colorsTableView registerClass:[UITableViewCell class] forCellReuseIdentifier:@"cell"];
    self.colorsArray = @[@"Red",@"Blue",@"Green",@"Yellow",@"Pink"];
}

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

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{

    return self.colorsArray.count;
}

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

    UITableViewCell *customCell = (UITableViewCell *)[tableView dequeueReusableCellWithIdentifier:@"cell" forIndexPath:indexPath];
    customCell.textLabel.text = self.colorsArray[indexPath.row];   

    return customCell;

}


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{

    UITableViewCell *selectedCell = (UITableViewCell *)[tableView cellForRowAtIndexPath:indexPath];
    [_delegate changeButtonTitleWithText:selectedCell.textLabel.text];
    [self dismissViewControllerAnimated:YES completion:nil];

}


@end

故事板截图：

请检查我的GitHub链接以测试示例项目（更改一个按钮标题）：

https://github.com/k-sathireddy/CustomDelegateSample

如需更改两个按钮标题，请按照以下步骤操作：

https://github.com/k-sathireddy/CustomDelegateSampleTwo