UITextField-鍵盤未顯示

Question

我在其中有一個父視圖控制器，我有一個自定義視圖，初始化此自定義視圖時，我設置了另一個自定義視圖，並且該視圖具有UITextField，但是當我單擊UITextfield時，鍵盤從不顯示。

ViewController：

    //
    //  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

自定義視圖，其中包含另一個包含UITextFields的自定義視圖

    //
    //  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

自定義視圖，LoginView

    //
    //  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

原因之一可能是UITextField上缺少明確的委托。

將其UITextField實例的委托設置為父容器（將其添加到的父容器），這將使委托和UITextField能夠偵聽更改。 然后，您可以進一步推動信封，並在初始化容器視圖時嘗試使UITextField聚焦：

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

然后可以在父視圖中實現以下內容：

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

最后，從代碼角度來看，如果LoginSignupViewController不需要用戶輸入，只需將用戶交互設置為NO，並僅在需要這樣做的視圖中設置標志（在本例中為UITextField的容器）即可。

另一個愚蠢的原因，如果您正在模擬器中運行應用程序，則可能是以下原因：

“當您的iOS模擬器打開時，轉到（頂部菜單）：

硬件>鍵盤>取消選中類似“模擬硬件鍵盤”之類的字詞

做完了！

希望對您有所幫助

Answer 2

鍵盤不顯示可能有幾個原因。 首先確保您的UITextField在筆尖和代碼中都是交互式的（UITextField本身和在Superview層次結構中應該是交互式的）。

接下來，您必須確保UITextfield的SuperViews足夠大，以便UITextfield保持交互性。 您可以為所有視圖賦予不同的背景顏色，看看是否有重疊的顏色。