从子界面获取数据返回给主界面

最新推荐文章于 2022-08-18 17:12:02 发布

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本文介绍了一个iOS应用中实现子界面与主界面通信的例子。通过定义协议`getLabelDelegate`并使用代理模式，子界面`AddViewController`能够将字符串传递给主界面`MyViewController`，主界面则负责收集这些字符串到数组中。此方案展示了如何在iOS应用的不同视图控制器间进行简单的数据交互。

子界面

@protocol getLabelDelegate <NSObject>

- (void)getNString:(NSString *)str;

@end


@interface AddViewController : UIViewController

@property (weak, nonatomic) id <getLabelDelegate> delegate;

@end

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    UIBarButtonItem *rightBtnItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemSave target:self action:@selector(finish)];
    self.navigationItem.rightBarButtonItem = rightBtnItem;
}

-(void) finish
{
    [self.delegate getNString:@"abc"];
    [self.navigationController popViewControllerAnimated:YES];
}

主界面

@interface MyViewController : UIViewController<getLabelDelegate>

@property (weak, nonatomic) id<getLabelDelegate> delegate;


@end

@implementation MyViewController
{
//    NSMutableArray *myArray;
    NSMutableArray *testArr;
}
- (void)getNString:(NSString *)str
{
    [testArr addObject:[[NSString alloc] initWithString:str]];
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view from its nib.
    
    UIBarButtonItem *rightBtnItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(add)];
    self.navigationItem.rightBarButtonItem = rightBtnItem;
}

-(void)add
{
    AddViewController *addvc = [[AddViewController alloc] init];
    addvc.delegate = self;
    [self.navigationController pushViewController:addvc animated:YES];
}