Question

我有一个很大的菜鸟问题。我是iOS的新人，我正在尝试这样做：

我有两个ViewControllers。第一个按钮有一个按钮，如果按下它，控制将转到第二个视图控制器。

这有效，但问题是当我尝试在第二个视图控制器中获取数据时。 UITextfield不起作用。

我正在尝试显示我在标签中插入文本字段的内容。但THE TEXTFIELD不起作用：（

我把IBOutlets成功地放在xibs中并将按钮连接到他们的IBActions ......

这是我的代码：

ViewController.h

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

@class SecondViewController;

@interface ViewController : UIViewController

@property (strong, nonatomic) SecondViewController *secondViewController;

-(IBAction)buttonClicked:(id)sender;

@end

ViewController.m

 #import "ViewController.h"

@implementation ViewController

@synthesize secondViewController;

-(IBAction)buttonClicked:(id)sender {
    self.secondViewController = [[SecondViewController alloc]initWithNibName:@"SecondViewController" bundle:nil];
    [self presentViewController:self.secondViewController animated:YES completion:nil];

}

SecondViewController.h

    #import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController {
    IBOutlet UITextField *textField;
    UIButton *obtener;
    IBOutlet UILabel *label;
}

@property (nonatomic, retain) IBOutlet UITextField *textField;
@property (nonatomic, retain) IBOutlet UIButton *obtener;
@property (nonatomic, retain) IBOutlet UILabel *label;

-(IBAction)obtenerClicked:(id)sender;

@end

SecondViewController.m

    #import "SecondViewController.h"

@implementation SecondViewController

@synthesize obtener, textField, label;

-(IBAction)obtenerClicked:(id)sender {
    label.text = textField.text;
}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
        // Custom initialization
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    // Releases the view if it doesn't have a superview.
    [super didReceiveMemoryWarning];

    // Release any cached data, images, etc that aren't in use.
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];

    // Do any additional setup after loading the view from its nib.
}

- (void)viewDidUnload
{
    [super viewDidUnload];
    // Release any retained subviews of the main view.
    // e.g. self.myOutlet = nil;
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    // Return YES for supported orientations
    return YES;
}

@end

Answer 1

在SecondViewController.h中，添加以下属性：

@property(nonatomic, readwrite) NSString* myString;

现在在firstViewController的onClick方法中，添加此行

-(IBAction)buttonClicked:(id)sender {

//....... Previous code....
 self.secondViewController.myString= @"String to be sent";
}

这将为你传递字符串..

如果要在文本字段中传递字符串，请使用：

-(IBAction)buttonClicked:(id)sender {

    //....... Previous code....
     self.secondViewController.textField.text= @"String to be sent";
    }

希望它能满足您的要求。

<强>更新
执行以下操作以获得预期结果：
1.使你的secondViewController成为textView委托。

在你的secondViewController.h中

将@interface SecondViewController : UIViewController替换为@interface SecondViewController : UIViewController<UITextFieldDelegate>

在你的secondViewController＆amp;中放一个按钮为它创建一个IBAction。
点击按钮事件，写下：

self.label.text = self.textfield.text;

告诉我它是否无效。

UITextField在我的SecondViewController中不起作用

1 个答案: