Objective c UILabel文本不更新

主视图有一个标签和一个按钮。我添加了一个子视图，其中包含一个UILabel和一个按钮。我想做的是，我想通过按下两个按钮中的一个按钮来更新两个视图中的两个标签。 问题是，如果单击子视图的按钮，子视图的标签只会更新。相反，只有在单击主视图中的按钮时，主视图的标签才会更改

我想知道如何更新其他视图的每个label.text

先谢谢你

这是我的密码。 1.ViewController.h

#import <UIKit/UIKit.h>
#import "SubView.h"

@interface ViewController : UIViewController{
    SubView *subView;
}

@property (weak, nonatomic) SubView *subView;
@property (retain, nonatomic) IBOutlet UILabel *amount;

@end

三,。子视图.h

#import <UIKit/UIKit.h>

@interface SubView : UIView {

    UIButton *btn;
    UILabel *label;
}
//@property (strong, nonatomic) UIView *view;
@property (weak, nonatomic) UIButton *btn;
@property (weak, nonatomic) UILabel *label;

- (UIButton *)addObject1;
- (UILabel *)addObject2;

@end

---

我想我明白了你想要做的，以下是你应该做的：

1-创建3个新文件（xib，m，h），称它们为SubView.xib，m，h。您必须确保它继承UIView

2-在xib文件中，绘制子视图元素并用它钩住IBO。但请确保文件所有者是ViewController，根视图类类型是“SubView”

3-在ViewController中创建子视图类型的IBOutlet

4-打开SubView.xib并将子视图（对象树中的根节点）与您在步骤3中创建的文件所有者IBOutlet挂钩

要在ViewController.m中加载新的子视图，只需调用以下行： 在该行之后，ViewController中的IBOutlet将具有子视图对象

[[NSBundle mainBundle] loadNibNamed:@"SubView" owner:self options:nil];

在上面的代码中，self会反映到ViewController中，我认为您需要阅读“”并了解“Object”和“Pointer”的含义

这是密码

子视图.h

#import <UIKit/UIKit.h>

@interface SubView : UIView {

    UIButton *btn;
    UILabel *label;
}
//@property (strong, nonatomic) UIView *view;
@property (weak, nonatomic) UIButton *btn;
@property (weak, nonatomic) UILabel *label;

- (UIButton *)addObject1;
- (UILabel *)addObject2;

@end

#import <UIKit/UIKit.h>

@interface SubView : UIView {

    UIButton *btn;
    UILabel *label;
}
@property (weak, nonatomic) UIViewController *vc;
@property (weak, nonatomic) UIButton *btn;
@property (weak, nonatomic) UILabel *label;

- (UIButton *)addObject1;
- (UILabel *)addObject2;

@end

ViewController.m

#import "ViewController.h"
#import "SubView.h" 

@interface ViewController ()

@end

@implementation ViewController

@synthesize subView=_subView;
@synthesize amount;

- (void)viewDidLoad
{
    [super viewDidLoad];

    subView = [[SubView alloc]initWithFrame:CGRectMake(10, 10, 300, 600)];

    [self.view addSubview:subView];

    amount = [[UILabel alloc]initWithFrame:CGRectMake(400, 400, 100, 50)];
    amount.text = @"test in the main view";
    [self.view addSubview:amount];

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btn.frame = CGRectMake(400, 300, 40, 20);
    btn.backgroundColor = [UIColor clearColor];
    [btn addTarget:self action:@selector(labelChange:)    
    forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn]; // add a button in the main view
// Do any additional setup after loading the view, typically from a nib.
}

- (IBAction)labelChange:(id)sender{
    amount.text = @"defaul label";

    SubView *sv = [[SubView alloc]init];
    sv.addObject2.text = @"label in the subview";

    NSLog(@"sv.addObject2.text = %@",sv.addObject2);
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
}

 - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return YES;
}

@end

#import "ViewController.h"
#import "SubView.h" 

@interface ViewController ()

@end

@implementation ViewController

@synthesize subView=_subView;
@synthesize amount;

- (void)viewDidLoad
{
    [super viewDidLoad];

    subView = [[SubView alloc]initWithFrame:CGRectMake(10, 10, 300, 600)];
    subView.vc = self;
    [self.view addSubview:subView];

    amount = [[UILabel alloc]initWithFrame:CGRectMake(400, 400, 100, 50)];
    amount.text = @"test in the main view";
    [self.view addSubview:amount];

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btn.frame = CGRectMake(400, 300, 40, 20);
    btn.backgroundColor = [UIColor clearColor];
    [btn addTarget:self action:@selector(labelChange:)    
    forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn]; // add a button in the main view
}

- (IBAction)labelChange:(id)sender{
    amount.text = @"defaul label";

    subview.addObject2.text = @"label in the subview";
}

@end

---

谢谢你的评论。很有帮助。谢谢你的推荐。这有助于解决我的问题。

#import "ViewController.h"
#import "SubView.h" 

@interface ViewController ()

@end

@implementation ViewController

@synthesize subView=_subView;
@synthesize amount;

- (void)viewDidLoad
{
    [super viewDidLoad];

    subView = [[SubView alloc]initWithFrame:CGRectMake(10, 10, 300, 600)];
    subView.vc = self;
    [self.view addSubview:subView];

    amount = [[UILabel alloc]initWithFrame:CGRectMake(400, 400, 100, 50)];
    amount.text = @"test in the main view";
    [self.view addSubview:amount];

    UIButton *btn = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    btn.frame = CGRectMake(400, 300, 40, 20);
    btn.backgroundColor = [UIColor clearColor];
    [btn addTarget:self action:@selector(labelChange:)    
    forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn]; // add a button in the main view
}

- (IBAction)labelChange:(id)sender{
    amount.text = @"defaul label";

    subview.addObject2.text = @"label in the subview";
}

@end