ios - UITextField - 键盘不显示

Question

我在里面有一个父 View Controller ，我有自定义 View ，当这个自定义 View 初始化时，我设置了另一个自定义 View ，这个 View 有 UITextFields，但是当我点击 UITextfield 时，键盘永远不会显示。

View Controller :

    //
    //  ViewController.m
    //  InstantForum
    //
    //  Created by trikam patel on 27/08/2014.
    //  Copyright (c) 2014 trikam patel. All rights reserved.
    //

    #import "ViewController.h"

    @interface ViewController ()

    @end

    @implementation ViewController
    @synthesize loginSignupControlView;

    - (void)viewDidLoad
    {
        [super viewDidLoad];

        self.view.userInteractionEnabled = YES;
        CGRect screenRect = [[UIScreen mainScreen] applicationFrame];

        self.loginSignupControlView = [[LoginSignupControlView alloc] initWithFrame:CGRectMake(0, 0, screenRect.size.width, 68)];
        [self.view addSubview:self.loginSignupControlView];

        // Do any additional setup after loading the view, typically from a nib.
    }


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

    @end

自定义 View ，包含另一个包含 UITextFields 的自定义 View

    //
    //  LoginSignupControlView.m
    //  InstantForum
    //
    //  Created by trikam patel on 28/08/2014.
    //  Copyright (c) 2014 trikam patel. All rights reserved.
    //

    #import "LoginSignupControlView.h"
    #import "UIHelper.h"
    #import "TextField.h"

    @implementation LoginSignupControlView

    - (id)initWithFrame:(CGRect)frame
    {
        self = [super initWithFrame:frame];
        if (self) {
        [self createView];
        }
        return self;
    }

    -(void)createView{

        self.isLogin = true;
        self.userInteractionEnabled = YES;

        self.backgroundColor = [UIColor colorWithRed:56.f/255 green:56.f/255 blue:57.f/255 alpha:1.0f];

        self.logoLabel = [UIHelper getUILabel:CGRectMake(10,35, 200, 14) :@"INSTANT FORUM" :[UIColor colorWithRed:222.0f/255 green:221.0f/255 blue:221.0f/255 alpha:1.0f] :[UIFont fontWithName:@"Helvetica" size:14]];
        [self addSubview:self.logoLabel];

        self.loginLabel = [UIHelper getUILabel:CGRectMake(190,35, 50, 14) :@"LOGIN" :[UIColor colorWithRed:106.0f/255 green:196.0f/255 blue:229.0f/255 alpha:1.0f] :[UIFont fontWithName:@"Helvetica" size:14]];
        [self addSubview:self.loginLabel];

        self.signupLabel = [UIHelper getUILabel:CGRectMake(250,35, 60, 14) :@"SIGNUP" :[UIColor colorWithRed:106.0f/255 green:196.0f/255 blue:229.0f/255 alpha:1.0f] :[UIFont fontWithName:@"Helvetica" size:14]];
        [self addSubview:self.signupLabel];

        [self setupView];

    }

    -(void)setupView{

        if(self.isLogin){

        CGRect screenRect = [[UIScreen mainScreen] applicationFrame];

        self.loginView = [[LoginView alloc] initWithFrame:CGRectMake(0, 68, screenRect.size.width, 286)];
        [self addSubview:self.loginView];

        self.imageViewFN = [UIHelper getUIImageView:CGRectMake(10, 10, 300, 35) :@"textbox1.png"];
        [self.loginView addSubview:self.imageViewFN];

        TextField *fnText = [[TextField alloc] initWithFrame:CGRectMake(20, 10, 280, 35)];
        //fnText.backgroundColor = [UIColor clearColor];
        fnText.text = @"Enter First Name";
        fnText.userInteractionEnabled = YES;
        fnText.enabled = YES;
        fnText.font = [UIFont fontWithName:@"Helvetica" size:14];
        fnText.textColor = [UIColor colorWithRed:105.0f/255 green:121.0f/255 blue:221.0f/255 alpha:1.0f];
        [self.loginView addSubview:fnText];

        }


    }



    /*
    // Only override drawRect: if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    - (void)drawRect:(CGRect)rect
    {
        // Drawing code
    }
    */

    @end

自定义 View ，登录 View

    //
    //  LoginView.m
    //  InstantForum
    //
    //  Created by trikam patel on 28/08/2014.
    //  Copyright (c) 2014 trikam patel. All rights reserved.
    //

    #import "LoginView.h"

    @implementation LoginView

    - (id)initWithFrame:(CGRect)frame
    {
        self = [super initWithFrame:frame];
        if (self) {

        self.backgroundColor = [UIColor colorWithRed:61.0f/255 green:81.0f/255 blue:168.0f/255 alpha:1.0f];
        self.userInteractionEnabled = YES;


        }
        return self;
    }

    /*
    // Only override drawRect: if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    - (void)drawRect:(CGRect)rect
    {
        // Drawing code
    }
    */

    @end

Answer 1

一个原因可能是 UITextField 上缺少明确的委托(delegate)。

将其 UITextField 实例的委托(delegate)设置为父容器(它被添加到的容器)，这将使委托(delegate)和 UITextField 能够监听更改。然后您可以进一步插入信封并尝试在容器 View 初始化时聚焦 UITextField:

self.tfText.delegate = self; // too many selfs for clarity purpose

然后您可以在父 View 中实现以下内容:

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField{ 
    return YES;
}

最后，在代码方面，如果 LoginSignupViewController 不需要用户输入，只需将用户交互设置为 NO 并仅在需要这样的 View 中设置标志，在本例中为 UITextField 的容器。

另一个愚蠢的原因，如果您在模拟器中运行您的应用程序，这可能是一个原因:

“当您的 iOS 模拟器打开时，转到(顶部菜单):

硬件 > 键盘 > 取消选中“模拟硬件键盘”之类的内容

完成!

希望对你有帮助