将UITextField文本从一个视图传递到另一个视图 [英] Passing of UITextField text from one view to another

问题描述

我在firstViewController上定义了一个UITextField，如下所示:

I defined a UITextField on my firstViewController as follow

// firstViewController.h
IBOutlet UITextField *PickUpAddress
@property (nonatomic, retain) UITextField *PickUpAddress;

//firstViewController.m
@synthesize PickUpAddress;

// Push secondView when the 'Done' keyboard button is pressed
- (BOOL)textFieldShouldReturn:(UITextField *)textField {
    [textField resignFirstResponder];
    if (textField == PickUpAddress) {
        SecondViewController *secondViewController= [[SecondViewController alloc]
                                                       initWithNibName:@"SecondViewController" 
                                                       bundle:nil];
        secondViewController.hidesBottomBarWhenPushed = YES;
        [self.navigationController pushViewController:secondViewController animated:YES];
        [secondViewController release];
    }

    return NO;
}

然后我试图在viewWillAppear期间在我的secondViewController中检索它

Then I tried to retrive it in my secondViewController during viewWillAppear

- (void)viewWillAppear:(BOOL)animated {
    BookingViewController *bookingViewController = [[BookingViewController alloc] init];
    NSString *addressString = [[NSString alloc] init];
    addressString = bookingViewController.PickUpAddress.text;
    NSLog(@"addressString is %@", bookingViewController.PickUpAddress.text);
}

但是它在我的控制台上返回为NULL.为什么? 在此先感谢:)

But it returns as NULL on my console. Why is that so? Thanks in advance :)

推荐答案

在secondViewController.h中添加

in secondViewController.h add

 NSString *text;

 @property (nonatomic, retain) NSString *text;

 -(void)setTextFromText:(NSString *)fromText;

在secondViewController.m中添加以下内容

in secondViewController.m add following

 - (void)setTextFromText:(NSString *)fromText
 {
     [text release]; 
     [fromText retain];
     text = fromText;
 }

在firstViewController.m中

in firstViewController.m before

[self.navigationController pushViewController:secondViewController animated:YES];

添加

[secondViewContoller setTextFromText:PickUpAddress.text];

现在让我解释一下代码.

Now let me explain the code.

您正在向第二个视图添加NSString，我们将在其中存储UITextField中的文本.然后，我们编写了一个方法，该方法将从其他NSString中设置该NSString. 在将secondViewController推入navigationController之前，您只是调用该方法以从PickUpAddress.text设置我们的文本. 希望能有所帮助.

You are adding an NSString to second view , where we will store the text from the UITextField. Then, we've written a method, which will set that NSString from some other NSString. Before pushing secondViewController to navigationController, you're just calling that method to set our text from PickUpAddress.text. Hope that helped.

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