Question

我正在构建转换器应用程序。在主屏幕中，我有一个文本字段用于输入数字，在文本字段下方，选择器视图将允许用户选择转换参数（例如kg到g）。

当用户使用以下方法单击背景时，我可以隐藏键盘

 (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
 [self.enterInput resignFirstResponder];

但是当我触摸选择器视图时键盘没有隐藏。

我的问题是当用户触摸选择器视图时如何关闭键盘。

Answer 1

获得解决方案

1）首先创建一个隐藏的roundRect按钮并将类型更改为自定义（适合选择器的大小）。

2）创建内部动作

 - (IBAction)hiddenButtonToHideKeyboard:(id)sender {
    [self.enterInput resignFirstResponder];
}

3）创建键盘显示通知

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

4）创建键盘消失通知

 [[NSNotificationCenter defaultCenter]addObserver:self selector:@selector(onKeyboardHide:) name:UIKeyboardWillHideNotification object:nil];

5）键盘出现时按钮可见

 -(void)onKeyboardAppear:(NSNotification *)notification
{
    hiddenButtonToHideKeyboard.hidden=NO;
}

6）键盘消失时隐藏按钮

-(void)onKeyboardHide:(NSNotification *)notification
{
    hiddenButtonToHideKeyboard.hidden=YES;
}

5）完成

我不认为这是一个完美的解决方案，但它对我有用：）

Answer 2

我在我的代码中使用它。我爬上响应链并重新分配响应者。我把它放在显示pickerView的方法中。到目前为止没有意外的问题如果键盘显示似乎工作，如果没有显示键盘，似乎不会崩溃。

    [[UIApplication sharedApplication] sendAction:@selector(resignFirstResponder) to:nil from:nil forEvent:nil];

Answer 3

你走了。 UIPickerViews是一个相当复杂的嵌套UIViews系统，这就是为什么你没有从touchesBegan:withEvent:方法得到任何响应。您可以做的是创建UIPickerView子类，如下所示：

//
//  MyPickerView.h
//

#import <UIKit/UIKit.h>

// Protocol Definition that extends UIPickerViewDelegate and adds a method to indicate a touch
@protocol MyPickerViewDelegate <UIPickerViewDelegate>

// This is the method we'll call when we've received a touch. Our view controller should implement it and hide the keyboard
- (void)pickerViewDidReceiveTouch:(UIPickerView *)pickerView;

@end

@interface MyPickerView : UIPickerView

// We're redefining delegate to require conformity to the MyPickerViewDelegate protocol we just made
@property (nonatomic, weak) id <MyPickerViewDelegate>delegate;

@end


//
//  MyPickerView.m
//

#import "MyPickerView.h"

@implementation MyPickerView
@synthesize delegate = _myPickerViewDelegate; // We changed the data type of delegate as it was declared in the superclass so it's important to link it to a differently named backing variable

- (UIView *)hitTest:(CGPoint)point withEvent:(UIEvent *)event {
    // We make sure to call the super method so all standard functionality is preserved
    UIView *hitView = [super hitTest:point withEvent:event];

    if (hitView) {
        // This will be true if the hit was inside of the picker
        [_myPickerViewDelegate pickerViewDidReceiveTouch:self];
    }

    // Return our results, again as part of preserving our superclass functionality
    return hitView;
}

@end

然后在ViewController中将其更改为符合<MyPickerViewDelegate>而不是<UIPickerViewDelegate>。这是好的，因为MyPickerViewDelegate继承自UIPickerViewDelegate并将通过标准UIPickerViewDelegate方法。

最后在视图控制器中实现pickerViewDidReceiveTouch:：

- (void)pickerViewDidReceiveTouch:(UIPickerView *)pickerView {
    [enterInput resignFirstResponder];
}

IOS - 触摸UIPickerView时关闭键盘

3 个答案: