键盘不会在应用程序中关闭

Posted 2023-03-08

【中文标题】键盘不会在应用程序中关闭

【英文标题】：Keyboard won't dismiss in app

【发布时间】：2013-10-15 02:13:08

【问题描述】：

在我正在制作的应用程序中，我有 3 个 UITextField 和一个 UITextView。对于他们两个，我的键盘都会出现，但我无法让它消失。我在 Stack Overflow 上查找了一些方法，但似乎无法以正确的方式实现它们。有人愿意告诉我我在以下代码行中做错了什么吗？

ViewController.h

@interface ViewController : UIViewController <UITextViewDelegate>

@property (strong, nonatomic) NSString *dna;
@property (weak, nonatomic) IBOutlet UITextField *dnaOut;
@property (weak, nonatomic) IBOutlet UITextField *mrnaOut;
@property (weak, nonatomic) IBOutlet UITextField *trnaOut;
@property (weak, nonatomic) IBOutlet UITextView *aminoOut;
- (IBAction)translateButton:(UIButton *)sender;
- (IBAction)clearButton:(UIButton *)sender;
@property (weak, nonatomic) IBOutlet UILabel *dnaError;
@property (weak, nonatomic) IBOutlet UILabel *mrnaError;
@property (weak, nonatomic) IBOutlet UILabel *trnaError;
@property (weak, nonatomic) IBOutlet UISegmentedControl *inputType;



@end

ViewController.m

- (void)viewDidLoad

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    _aminoOut.delegate = self;


    -(BOOL) _aminoOut textFieldShouldReturn:(UITextField *)textfield 
        [textField resignFirstResponder];
        return YES;
    


    - (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range
replacementText:(NSString *)text
    

        if ([text isEqualToString:@"\n"]) 

            [textView resignFirstResponder];
            // Return FALSE so that the final '\n' character doesn't get added
            return NO;
        
        // For any other character return TRUE so that the text gets added to the view
        return YES;
    

【问题讨论】：

你设置了 UITextFields 的代理了吗？

【参考方案1】：

为什么所有这些代码都在您的 viewDidLoad 方法中？应该是：

.h 文件：

@interface ViewController : UIViewController <UITextViewDelegate, UITextFieldDelegate>

// Other stuff here...

.m 文件：

- (void)viewDidLoad

    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    self.dnaOut.delegate = self;
    self.mrnaOut.delegate = self;
    self.trnaOut.delegate = self;
    self.aminoOut.delegate = self;



- (BOOL)textFieldShouldReturn:(UITextField *)textfield 
    [textField resignFirstResponder];
    return YES;


- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text

    if ([text isEqualToString:@"\n"]) 

        [textView resignFirstResponder];
        // Return FALSE so that the final '\n' character doesn't get added
        return NO;
    
    // For any other character return TRUE so that the text gets added to the view
    return YES;

【参考方案2】：

我认为您忘记将 UITextField 的委托连接到文件所有者。

【讨论】：

在Interface Builder中右击你的UITextField，你会看到“delegate”和一个圆圈，把那个圆圈拖到文件所有者那里。