通过视图控制器将 UITextField 转换为 UILabel

Question

我确信对此有一个简单的解释。 我希望传输数据（而不是存储），但将用户输入的文本传输到文本字段中，并将其显示为另一个 ViewController 中的 UILabel。 我已经知道如何将用户输入的文本转换为同一视图控制器上的标签。 我想我的问题是导入。

.h：

@interface ViewController : UIViewController {
IBOutlet UITextField *firstPerson;
IBOutlet UITextField *secondPerson;
IBOutlet UIButton *calculateButton;
NSString *firstName;
NSString *secondName;
}
@property (nonatomic, retain) IBOutlet UITextField *firstPerson;
@property (nonatomic, retain) IBOutlet UITextField *secondPerson;
@property (nonatomic, retain) NSString *firstName;
@property (nonatomic, retain) NSString *secondName;
@property (nonatomic, retain) IBOutlet UIButton *calculateButton;
-(IBAction)calculate;
@end

.m：

-(IBAction)calculate {
//Linked to UIButton
//This is the first View Controller.
//    firstName = firstPerson.text;
//    secondName = secondPerson.text;
secondViewController = [[ShowStats alloc] init];
}

我的第二视图控制器 .m（ShowStats）：

#import "ShowStats.h"
#import "ViewController.h"
- (void)viewDidLoad
{
firstName = firstPerson.text;
secondName = secondPerson.text;


[super viewDidLoad];
}

非常感谢！ 编辑

ViewController.h

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

@interface ViewController : UIViewController {
IBOutlet UITextField *firstPerson;
IBOutlet UITextField *secondPerson;
IBOutlet UIButton *calculateButton;
//NSString *firstName;
// NSString *secondName;
}
@property (nonatomic, retain) IBOutlet UITextField *firstPerson;
@property (nonatomic, retain) IBOutlet UITextField *secondPerson;
//@property (nonatomic, retain) NSString *firstName;
//@property (nonatomic, retain) NSString *secondName;
@property (nonatomic, retain) IBOutlet UIButton *calculateButton;
-(IBAction)calculate;
@end

ViewController.m

#import "ViewController.h"
#import "ShowStats.h"

@implementation ViewController
@synthesize firstPerson, secondPerson;
//@synthesize firstName, secondName;
@synthesize calculateButton;
ShowStats *secondViewController;

-(IBAction)calculate {
secondViewController = [[ShowStats alloc] init];
secondViewController.firstName = firstPerson.text;
}

ShowStats.h

@interface ShowStats : UIViewController{

IBOutlet UILabel *nameStats;
}
@property (nonatomic, retain) IBOutlet UILabel *nameStats;
@property (nonatomic, retain) NSString *firstName;
@property (nonatomic, retain) NSString *secondName;
@end

ShowStats.m

- (void)viewDidLoad
{
nameStats.text = [NSString stringWithFormat:@"%@", firstName];    
//secondLabel.text = self.secondName;


[super viewDidLoad];
}

Answer 1

在 ShowStats 类
中创建这些属性

@property (nonatomic, retain) NSString *firstName;
@property (nonatomic, retain) NSString *secondName;

，并将其更改为此，

-(IBAction)calculate {
     secondViewController = [[ShowStats alloc] init];
     secondViewController.firstName = firstPerson.text;
     secondViewController.secondName = secondPerson.text;
}

然后将这些字符串设置为 viewDidLoad 中的 UILablel

Answer 2

在 ShowStats.h 中，添加以下内容：

@property(nonatomic, copy) NSString* firstName;
@property(nonatomic, copy) NSString* secondName;

在 ShowStats.m 中添加/更新以下内容：

@synthesize firstName, secondName;

//...

- (id) init {
    if (self = [super init]) {
        self.firstName = nil;
        self.secondName = nil;
        //...
    }

    return self;
}

- (void) dealloc {
    self.firstName = nil;
    self.secondName = nil;
    //...

    [super dealloc];
}

- (void)viewDidLoad {
    //or even better, do this in viewWillAppear instead
    firstLabel.text = self.firstName;
    secondLabel.text = self.secondName;
    //...


    [super viewDidLoad];
}

最后，在 ViewController.m 中，实现 计算像这样：

-(IBAction)calculate {
    //Linked to UIButton
    //This is the first View Controller.
    //    firstName = firstPerson.text;
    //    secondName = secondPerson.text;
    secondViewController = [[ShowStats alloc] init];
    secondViewController.firstName = firstPerson.text;
    secondViewController.secondName = secondPerson.text;

    //display the view controller here

    [secondViewController autorelease];
}

Answer 3

如果它是导航，那么您可以在 SecondViewController 中调用：

ViewController *viewController = [self.navigationController.viewControllers objectAtIndex:0];
firstName = [[viewController firstPerson] text];
secondName = [[viewController secondPerson] text];

或者您可以对单视图应用程序执行以下操作：

AppDelegate *appDelegate = [[UIApplication sharedApplication] delegate];
ViewController *viewController = [appDelegate viewController];
firstName = [[viewController firstPerson] text];
secondName = [[viewController secondPerson] text];

* 编辑 *

将两个标签添加到您的 .h 文件（非原子，保留）和在 .m 中合成。在 viewDidLoad 中初始化标签，然后设置它们（假设它们称为 label1 和 label2）：

[label1 setText:firstName];
[label2 setText:secondName];