如何更改 Xcode 键盘上按钮 "return" 的操作？

Question

我需要更改键盘上按钮 "return" 的文本，我什至需要更改其操作。动作应该是一个新的段落。你能帮帮我吗？

Answer 1

UITextField 具有您可以实现的委托方法，当您在键盘上按 return 时会调用它： - (BOOL)textFieldShouldReturn:(UITextField *)textField 您可以向 textView 文本添加一个新行字符“\n”，它将转到下一行。

UITextView 它应该像那样工作，当您按 Return.

时它会换行

Answer 2

您不能将 Return 按钮重命名为任何自定义文本

return 键可以采用的一些默认值是

typedef enum : NSInteger {
   UIReturnKeyDefault,
   UIReturnKeyGo,
   UIReturnKeyGoogle,
   UIReturnKeyJoin,
   UIReturnKeyNext,
   UIReturnKeyRoute,
   UIReturnKeySearch,
   UIReturnKeySend,
   UIReturnKeyYahoo,
   UIReturnKeyDone,
   UIReturnKeyEmergencyCall,
} UIReturnKeyType;

默认为 "return" 其他为 Go，Google，Yahoo 为原样。

看here.

要捕获 return 事件，您可以使用 textView 委托方法

- (BOOL)textView:(UITextView *)textView shouldChangeTextInRange:(NSRange)range replacementText:(NSString *)text {
     if ([text isEqualToString:@"\n"]) {
        NSLog(@"Pressed Return Key");
    } else {
       NSLog(@"Pressed Any Other Key");
       }
return YES;
}

Answer 3

点击并在此处设置您的关键字

 [textField setReturnKeyType:UIReturnKeyDone];

对于键盘，在您的 class 中实施协议，设置

textfield.delegate = self;


  - (BOOL)textFieldShouldReturn:(UITextField *)textField {

    // write you code here what you want .

        return YES;
    }

如果你想使用 UITextView，请参考这个 How to dismiss keyboard for UITextView with return key?

Answer 4

这是在键盘上添加自定义按钮的方法。但是苹果可能会拒绝你的应用，所以要小心。

- (void)viewWillAppear:(BOOL)animtated {

    // Register the observer for the keyboardWillShow event
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(keyboardWillShow:) name:UIKeyboardDidShowNotification object:nil];

}

- (void)viewWillDisappear:(BOOL)animtated {
    [[NSNotificationCenter defaultCenter] removeObserver:self];
}

- (void)keyboardWillShow:(NSNotification *)notification {
    // create custom buttom
    UIButton *doneButton = [UIButton buttonWithType:UIButtonTypeCustom];
    doneButton.frame = CGRectMake(self.view.frame.size.width- 100, self.view.frame.size.height - 200.0f, 106, 53);
    doneButton.adjustsImageWhenHighlighted = NO;
    [doneButton addTarget:self action:@selector(addParaGraph:) forControlEvents:UIControlEventTouchUpInside];
    [doneButton setBackgroundColor:[UIColor redColor]];
    [doneButton setTitle:@"Add Paragraph" forState:UIControlStateNormal];
    [doneButton addTarget:self action:@selector(textFieldShouldReturn:) forControlEvents:UIControlEventTouchUpInside];

    // locate keyboard view
    UIWindow *tempWindow = [[[UIApplication sharedApplication] windows] objectAtIndex:1];
    UIView *keyboard;
    for (int i = 0; i < [tempWindow.subviews count]; i++) {
        keyboard = [tempWindow.subviews objectAtIndex:i];
        // keyboard view found; add the custom button to it
        //if ([[keyboard description] hasPrefix:@"<UIPeripheralHostView"] == YES) {
            [keyboard addSubview:doneButton];
        //}
    }
}

- (void)addParaGraph:(id)sender{

    // Write here you code to add new paragraph
}

-(BOOL)textFieldShouldReturn:(UITextField *)theTextField {
    // Set the FirstResponder of the UITextField on the layout
    [theTextField resignFirstResponder];
    return YES;
}

Answer 5

Swift 3

let addressTextField = UITextField()
addressTextField.placeholder = "Search or enter website name"
addressTextField.layer.borderColor = UIColor.gray.cgColor
addressTextField.layer.borderWidth = 1.0
addressTextField.returnKeyType = .go
view.addSubview(addressTextField)
addressTextField.delegate = self

extension YourNaneController: UITextFieldDelegate {
    func textFieldShouldReturn(_ textField: UITextField) -> Bool {
        textField.resignFirstResponder()
        return true
    }
}

如何更改 Xcode 键盘上按钮 "return" 的操作？

How can i change action of the button "return" on the keyboard on Xcode?

keyboard

text

action

return

ios