Iphone 如何使用同一按钮隐藏和显示键盘

我有

UITextField

，它在应用程序启动时成为第一响应者。然后，我有一个

ui按钮

，当按下它时，它将

退出FirstResponder

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如何使用相同的按钮隐藏和显示键盘？可能吗？

根据您的需要，以下代码应该具有相同的按钮，用于隐藏和显示文本字段的键盘

-(IBAction) buttonPressed:(id) sender {
        UIButton *button = (UIButton *) sender;
        button.selected = !button.selected;
        if (button.selected) {
            // show the keyboard.
            [textField becomeFirstResponder];
        }else {
            // Hide the keyboard.
            [textField resignFirstResponder];
        }
}

if ([textField isFirstResponder]) {
    [textField resignFirstResponder];
} else {
    [textField becomeFirstResponder];
}

编辑
您还可以输入代码来更改if循环中按钮的标题。

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放置代码以更改按钮标题的适当位置将位于textField的委托方法中

-textfieldDiBeginediting:

和

-textFieldDidEndEditing:

按钮从未被选中。将始终隐藏键盘！？您希望按钮的性能如何？

mytest.h

IBOutlet UITextField *myTextField;
IBOutlet UIButton *myButton

- (IBAction) showHideKeyBoard:(id)sender;

mytest.m

-(IBAction) showHideKeyBoard:(id) sender {

        if (myButton.selected) {
            // show the keyboard.
            [myTextField becomeFirstResponder];
            [myButton setTitle:@"Hide" forState:UIControlStateNormal];
            myButton.selected = NO;
        }else {
            // Hide the keyboard.
            [myTextField resignFirstResponder];
            [myButton setTitle:@"Show" forState:UIControlStateNormal];
            myButton.selected = YES;
        }
}