Ios Objective-C更改UILabel文本

我做了一个问答游戏。我在屏幕上放了一个问题标签。当我试图改变它的文本时，文本没有改变

QuizScreen.h

    #import <UIKit/UIKit.h>
int score = 0;
int lives = 3;
int QuestionSelected = 0;
NSString *AnswerRunning;
@interface QuizScreen : UIViewController
{

    IBOutlet UITextField *Answer;
    IBOutlet UIButton *Go;
    IBOutlet UILabel *Question;
    IBOutlet UILabel *Session;
    IBOutlet UILabel *Lives;
    IBOutlet UILabel *Score;
    IBOutlet UIButton *Exit;

}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event;
-(IBAction)GoBtn:(id)sender;
-(void)questioning;

@end

---

当我运行它并编写答案时，标签的文本没有变化。我尝试了stringWithFormat，但它不起作用。奇怪的是会话标签的文本发生了变化。但我找不到任何差异

似乎问题标签的文本只在方法中发生了变化： -（b）质询

但我找不到你在哪里打电话。在它的入口设置断点，你们永远也到不了那个里。据我所知，应该在viewDidLoad和GoBtn:methods末尾调用您的代码[自问]

附言。

---

你应该注意，和。特别是命名变量、数据类型、方法（例如变量不应以大写字母开头，类或结构应以大写字母开头）

您是否调试并检查所有设置是否正确？标签是否只有默认文本？标签中打印的内容所有标签都不起作用，或者任何用于检查标签中存储的值的实现NSLog都不起作用。请检查您的iboutlet连接是否正确连接我是Objective-C iOS SDK的新手（我刚刚在youtube上观看了一个视频）。我会注意它。

#import "QuizScreen.h"

@interface QuizScreen ()

@end

@implementation QuizScreen
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self.view endEditing:YES];
}
-(IBAction)GoBtn:(id)sender{

    switch (QuestionSelected) {
        case 0:
            if ([Answer.text isEqualToString: @"YOUR WORD"]){
                score = score + 1;
                Score.text = [NSString stringWithFormat:@"Score: %i" , score];
                Session.text = [NSString stringWithFormat:@"Correct Answer!! Score +1"];
            }else{
                lives = lives - 1;
                Lives.text = [NSString stringWithFormat:@"Lives: %i" , lives];
                Session.text = [NSString stringWithFormat:@"Wrong Answer!!! Lives -1"];
            }
            QuestionSelected = QuestionSelected + 1;
            break;
        case 1:
            if ([Answer.text isEqualToString: @"YOUR WORD"]){
                score = score + 1;
                Score.text = [NSString stringWithFormat:@"Score: %i" , score];
                Session.text = [NSString stringWithFormat:@"Correct Answer!! Score +1"];
            }else{
                lives = lives - 1;
                Lives.text = [NSString stringWithFormat:@"Lives: %i" , lives];
                Session.text = [NSString stringWithFormat:@"Wrong Answer!!! Lives -1"];
            }
            QuestionSelected = QuestionSelected + 1;
            break;
        case 2:
            if ([Answer.text isEqualToString: @"YOUR WORD"]){
                score = score + 1;
                Score.text = [NSString stringWithFormat:@"Score: %i" , score];
                Session.text = [NSString stringWithFormat:@"Correct Answer!! Score +1"];
            }else{
                lives = lives - 1;
                Lives.text = [NSString stringWithFormat:@"Lives: %i" , lives];
                Session.text = [NSString stringWithFormat:@"Wrong Answer!!! Lives -1"];
            }
            QuestionSelected = QuestionSelected + 1;
            break;
        case 3:
            if ([Answer.text isEqualToString: @"YOUR WORD"]){
                score = score + 1;
                Score.text = [NSString stringWithFormat:@"Score: %i" , score];
                Session.text = [NSString stringWithFormat:@"Correct Answer!! Score +1"];
            }else{
                lives = lives - 1;
                Lives.text = [NSString stringWithFormat:@"Lives: %i" , lives];
                Session.text = [NSString stringWithFormat:@"Wrong Answer!!! Lives -1"];
            }
            QuestionSelected = QuestionSelected + 1;
            break;
        case 4:
            if ([Answer.text isEqualToString: @"YOUR WORD"]){
                score = score + 1;
                Score.text = [NSString stringWithFormat:@"Score: %i" , score];
                Session.text = [NSString stringWithFormat:@"Correct Answer!! Score +1"];
            }else{
                lives = lives - 1;
                Lives.text = [NSString stringWithFormat:@"Lives: %i" , lives];
                Session.text = [NSString stringWithFormat:@"Wrong Answer!!! Lives -1"];
            }
            QuestionSelected = QuestionSelected + 1;
            break;
        case 5:
            if ([Answer.text isEqualToString: @"YOUR WORD"]){
                score = score + 1;
                Score.text = [NSString stringWithFormat:@"Score: %i" , score];
                Session.text = [NSString stringWithFormat:@"Correct Answer!! Score +1"];
            }else{
                lives = lives - 1;
                Lives.text = [NSString stringWithFormat:@"Lives: %i" , lives];
                Session.text = [NSString stringWithFormat:@"Wrong Answer!!! Lives -1"];
            }
            QuestionSelected = QuestionSelected + 1;
            break;
        case 6:
            if ([Answer.text isEqualToString: @"YOUR WORD"]){
                score = score + 1;
                Score.text = [NSString stringWithFormat:@"Score: %i" , score];
                Session.text = [NSString stringWithFormat:@"Correct Answer!! Score +1"];
            }else{
                lives = lives - 1;
                Lives.text = [NSString stringWithFormat:@"Lives: %i" , lives];
                Session.text = [NSString stringWithFormat:@"Wrong Answer!!! Lives -1"];
            }
            QuestionSelected = QuestionSelected + 1;
            break;
        case 7:
            if ([Answer.text isEqualToString: @"YOUR WORD"]){
                score = score + 1;
                Score.text = [NSString stringWithFormat:@"Score: %i" , score];
                Session.text = [NSString stringWithFormat:@"Correct Answer!! Score +1"];
            }else{
                lives = lives - 1;
                Lives.text = [NSString stringWithFormat:@"Lives: %i" , lives];
                Session.text = [NSString stringWithFormat:@"Wrong Answer!!! Lives -1"];
            }
            break;

        default:
            break;
    }
}
-(void)questioning {
    switch (QuestionSelected) {
    case 0:
        Question.text = @"You can only keep it once you give it to somebody.What is it?";

        break;
    case 1:
        Question.text = @"Light hides me and darkness kills me.What am I?";

        break;
    case 2:
        Question.text = @"Voiceless it cries,Wingless flutters,Toothless bites,Mouthless mutters.";

        break;
    case 3:
        Question.text = @"What goes in the water black and comes out red?";

        break;
    case 4:
        Question.text = @"It's hard to give up.Remove part of it and you still have a bit.Remove another part, but bit is still there.Remove another and it remains.What is it?";
               break;
    case 5:
        Question.text = @"With pointed fangs I sit and wait,with piercing force I serve out fate.Grabbing bloodless victims, proclaiming my might;physically joining with a single bite.What am I?";

        break;
    case 6:
        Question.text = @"Jasmine has a toaster with two slots that toasts one side of each piece of bread at a time, and it takes one minute to do so.If she wants to make 3 pieces of toast, what is the least amount of time she needs to toast them on both sides?";

        break;
    case 7:
        Question.text = @"A man was born on January 1st, 23 B.C. and died January 2nd, 23 A.D. How old did he live to be?";

        break;

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

- (void)viewDidLoad

{


    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

@end