我在使用未声明的标识符时遇到了麻烦。我创建了一个自定义UIImageView，并在其中声明了@property UILabel'answeLbl'。我已经将自定义UIImageView.h文件导入到ViewController.h文件中，但是每当我尝试使用“ answerLbl”时，都会出现错误“使用未声明的标识符”。如何解决此问题，我需要在ViewController中使用此“ answerLbl”吗？
这是ViewController.h
#import <UIKit/UIKit.h>
#import "NumberPadImageView.h"
@interface ViewController : UIViewController {
NumberPadImageView *numberKeyboard;
}
然后是自定义uiiimageview => NumberPadImageView.h
#import <UIKit/UIKit.h>
@interface NumberPadImageView : UIImageView {
UILabel *answerLbl;
UIButton *oneBtn;
UIButton *twoBtn;
UIButton *threeBtn;
UIButton *fourBtn;
UIButton *fiveBtn;
UIButton *sixBtn;
UIButton *sevenBtn;
UIButton *eightBtn;
UIButton *nineBtn;
UIButton *zeroBtn;
UIButton *backBtn;
UIButton *periodBtn;
UIButton *clearAnswerFieldBtn;
}
@property (nonatomic, strong) IBOutlet UILabel *answerLbl;
-(IBAction)buttonPressed:(UIButton *)sender;
-(IBAction)backspace:(id)sender;
-(IBAction)clearAnswerLbl:(id)sender;
@property (nonatomic, strong) NumberPadImageView *imageView;
在viewDidLoad中，
self.imageView = [[NumberPadImageView alloc]init];
通过访问
self.imageView.answerLbl
并将answerLbl声明为属性，
@property (nonatomic, strong) UILabel *answerLbl;
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我来说两句