保留NSString中文本框的值

Question

这是我的.h文件：

我遇到问题的IBOutlet是文本框。我想将文本框中的值保留为NSString：

@interface UploaderViewController : UIViewController <UINavigationControllerDelegate, UIImagePickerControllerDelegate> {
    IBOutlet UIImageView *imageView;
    IBOutlet UITextField *textCaption;
    NSString *caption;
}

- (IBAction)pushPick;
- (IBAction)pushUpload;
@property (nonatomic, retain) IBOutlet UITextField *textCaption;

@end

值存储在此NSString中：

- (IBAction)pushUpload {
    caption = textCaption.text;
}

Answer 1

我认为你打算做这样的事情：

- (IBAction)pushUpload {
    [caption release];
    caption = [textCaption.text copy];
}

Answer 2

在shouldChangeTextInRange中调用你的pushUpload。