ios - TextField becomeFirstResponder 不显示键盘

Question

在我的程序中，我需要显示来自文本字段的文本，它在工具栏中不是用户交互的，它是键盘的附属 View 。当我按下按钮时，这部分工作。然后，如果设备旋转，我需要隐藏键盘。这部分也可以正常工作。但是当我回到 portret 并按下需要显示键盘的按钮时，什么也没有。

这是我的代码:

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UITextField *textField;

@end

@implementation ViewController{
    UITextField *invisibleTextfield;
    UITextField *fieldToEnterText;
}
- (IBAction)buttonAction:(id)sender {
    [invisibleTextfield becomeFirstResponder];
}

#pragma mark - Text Field
- (UIToolbar *)keyboardToolBar {

    UIToolbar *toolbar = [[UIToolbar alloc] init];
    [toolbar sizeToFit];
    [toolbar setOpaque:NO];
    [toolbar setTranslucent:YES];
    UIBarButtonItem *textFieldItem = [[UIBarButtonItem alloc] initWithCustomView:fieldToEnterText];
    UIBarButtonItem *fixItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace target:nil action:nil];


    NSArray *itemsArray = @[fixItem,textFieldItem,fixItem];

    [toolbar setItems:itemsArray];

    return toolbar;
}

-(void)textFieldDidBeginEditing:(UITextField *)textField{
    if ([invisibleTextfield isFirstResponder]) {
        NSLog(@"did began editing invisible");
        [fieldToEnterText becomeFirstResponder];
        fieldToEnterText.text = _textField.text;
    }
}

- (void)textFieldDidEndEditing:(UITextField *)textField{
    _textField.text = fieldToEnterText.text;
}

-(void) willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration
{
    if ([fieldToEnterText isFirstResponder]) {
        [fieldToEnterText resignFirstResponder];
    }
}

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

    fieldToEnterText = [[UITextField alloc]initWithFrame:CGRectMake(0, 0, self.view.frame.size.width-30, 30)];
    fieldToEnterText.borderStyle = UITextBorderStyleRoundedRect;
    fieldToEnterText.delegate = self;
    [fieldToEnterText setKeyboardType:UIKeyboardTypeNumberPad];
    [fieldToEnterText setTextAlignment:NSTextAlignmentCenter];

    invisibleTextfield = [[UITextField alloc] init];
    [invisibleTextfield setKeyboardType:UIKeyboardTypeNumberPad];
    invisibleTextfield.inputAccessoryView = [self keyboardToolBar];
    invisibleTextfield.delegate = self;
    [self.view addSubview:invisibleTextfield];
    _textField.text = @"Text";
}

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

@end

Answer 1

默认情况下，iOS 模拟器已连接硬件键盘。此行为类似于连接蓝牙键盘时设备的行为方式。

您可以点击 cmd-k 来打开/关闭软件键盘，就像您可以使用蓝牙键盘上的弹出按钮一样。

如果要测试断开连接的配置，可以通过shift-cmd-k断开硬件键盘