iphone - 在 Xcode 4.3 中将 UIToolbar 放置在键盘上

Question

这是我的第一篇文章，我对 iOS 编程还很陌生。我正在使用 xcode 4.3，并且有一个可能是一个简单的问题。我已经寻找了一种将工具栏放置在键盘上方的方法，上面有上一个/下一个按钮。我发现了一些关于当 xcode 使用界面生成器时如何执行此操作的教程。但我找不到适用于最新版本 xcode 的版本。因此，我借鉴了在互联网和苹果开发网站上找到的内容，并编写了一些代码。唯一的是，它不起作用!我收到一条错误消息，指出在 inputAcessoryView 行上分配给只读属性。我知道这可能很简单，但是当将代码从以前的版本转移到新版本时，我很可能搞砸了一些事情。有人可以检查我的代码并让我知道我做错了什么。非常感谢。我已包含我的 .h/.m 文件

    #import <UIKit/UIKit.h>

    @interface keyboardViewController : UIViewController


    @property (retain, nonatomic) IBOutlet UIView *textField1;
    @property (retain, nonatomic) IBOutlet UIView *textField2;

    @property (nonatomic, retain) UIToolbar *keyboardToolbar;

    -(void)resignKeyboard:(id)sender;
    -(void)previousField:(id)sender;
    -(void)nextField:(id)sender;

    @end

实现

    #import "keyboardViewController.h"

    @interface keyboardViewController ()

    @end

    @implementation keyboardViewController
    @synthesize textField1;
    @synthesize textField2;
    @synthesize keyboardToolbar;

    - (void)viewDidLoad
    {
        [super viewDidLoad];

        if (keyboardToolbar == nil)
        {
            keyboardToolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0,                            self.view.bounds.size.width, 44)]; 

            UIBarButtonItem *previousButton = [[UIBarButtonItem alloc] initWithTitle:@"previous" 
                                                                               style:UIBarButtonItemStyleBordered
                                                                      target:self 
                                                                      action:@selector(previousField:)];
            UIBarButtonItem *nextButton = [[UIBarButtonItem alloc] initWithTitle:@"next" 
                                                                           style:UIBarButtonItemStyleBordered
                                                                          target:self 
                                                                          action:@selector(nextField:)];

            UIBarButtonItem *extraSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:(UIBarButtonSystemItemFlexibleSpace) target:nil action:nil];


            UIBarButtonItem *done = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:(UIBarButtonSystemItemDone) target:self action:@selector(resignKeyboard:)];



            [keyboardToolbar setItems:[[NSArray alloc] initWithObjects:previousButton, nextButton, extraSpace, done, nil]];

            textField1.inputAccessoryView  = keyboardToolbar;
            textField2.inputAccessoryView  = keyboardToolbar;


        }


    }

    -(void) resignKeyboard:(id)sender
    {
        if ([textField1 isFirstResponder])
            [textField1 resignFirstResponder];

        else if ([textField2 isFirstResponder])
        [textField2 resignFirstResponder];
    }

    -(void) previousField:(id)sender
    {
        if ([textField1 isFirstResponder])
            [textField2 becomeFirstResponder];

        else if ([textField2 isFirstResponder])
            [textField1 becomeFirstResponder];
    }


    -(void) nextField:(id)sender
    {
        if ([textField1 isFirstResponder])
            [textField2 becomeFirstResponder];

        else if ([textField2 isFirstResponder])
            [textField1 becomeFirstResponder];
    }


    - (void)viewDidUnload
    {
        [self setTextField1:nil];
        [self setTextField2:nil];
        [self setKeyboardToolbar:nil];
        [super viewDidUnload];
        // Release any retained subviews of the main view.
    }

    - (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
    {
        return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
    }

    @end

Answer 1

@interface keyboardViewController : UIViewController<UITextFieldDelegate>


@property (retain, nonatomic) IBOutlet UITextField *textField1;
@property (retain, nonatomic) IBOutlet UITextField *textField2;

并在 .m 位置代替此代码

        textField1.inputAccessoryView  = keyboardToolbar;
        textField2.inputAccessoryView  = keyboardToolbar;

粘贴这些代码

for (id view in self.view.subviews) {
    if ([view isKindOfClass:[UITextField class]]) {
        [(UITextField *)view setInputAccessoryView:keyboardToolbar];
    }
}

粘贴此代码

-(void) resignKeyboard:(id)sender{

         [self.view endEditing:YES];
}

而不是这个

-(void) resignKeyboard:(id)sender
    {
        if ([textField1 isFirstResponder])
            [textField1 resignFirstResponder];

        else if ([textField2 isFirstResponder])
        [textField2 resignFirstResponder];
    }

在viewDidLoad方法中添加此代码

[[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardWillShowNotification object:nil];

和

-(void)nextField:(id)sender{

    if ([textField1 isFirstResponder]) {

        [textField2 becomeFirstResponder];
        [previousButton setEnabled:YES];
        [nextButton setEnabled:NO];
    }
}

-(void)previousField:(id)sender{

    if ([textField2 isFirstResponder]) {

        [textField1 becomeFirstResponder];
        [nextButton setEnabled:YES];
        [previousButton setEnabled:NO];
    }
}

-(void)keyboardWillShow:(id)sender{

    if ([textField2 isFirstResponder]) {

        [nextButton setEnabled:NO];
        [previousButton setEnabled:YES];
    }else if ([textField1 isFirstResponder]) {

        [nextButton setEnabled:YES];
        [previousButton setEnabled:NO];
    }
}