iphone – 如何在一个视图中使用一个UIPickerView用于多个文本字

我的想法如下：你可以创建8个不同的数组 – 一个用于填充UIPickerView,具体取决于UITextField被点击的内容.在接口中将它们声明为NSArray并在viewDidLoad中初始化：

array1st = ...
array2nd = ...
array3d = ...
//and until 8.

然后你创建另一个只是为了指向应该填充它的数组(如NSArray * currentArray),你甚至不需要初始化它=它将仅用于指向正确的数组.

因此,您应该将UITextFields的委托设置为视图控制器,并在方法textFieldShouldBeginEditing中检查谁是UITextField,将正确的数组指定为currentArray,使用reloadData重新加载UIPickerView,并在相同的textFieldShouldBeginEditing方法中返回NO. currentTextField是一个指针,只知道被编辑的currentUITextField是什么 – 我们需要存储它以便能够在选择器中选择数据后设置文本.在接口中声明currentTextField.

- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField
{
    currentTextField = textField;
    if (textField == myFirstTextView)
    {
        currentArray = array1st;
        [pickerView reloadData];
        [self animatePickerViewIn];
        return NO;
    }
    //and this way until 8th
}

因此,当您的视图控制器(实际上是UIPickerViewDelegate)时,您根据当前数组填充UIPickerView并且您不需要更改任何内容,只需使用currentArray作为数组来获取数据.

现在,要显示pickerView：

连接IBOutlet后,在viewDidLoad中你应该做两件事：设置UIPickerView的框架并将其添加为子视图：

pickerView.frame = CGRectMake(0,self.view.frame.size.height,pickerView.frame.size.width,pickerView.frame.size.height);
pickerView.delegate = self;
pickerView.dataSource = self;
//or you can do it via Interface Builder,right click the pickerView and then connect delegate and dataSource to the file's owner
[self.view addSubview:pickerView];

现在,您需要创建名为animatePickerViewIn的方法,我们在用户点击UITextField时调用该方法.

-(void)animatePickerViewIn
{

    [UIView animateWithDuration:0.25 animations:^{
        [pickerView setFrame:CGRectMake(0,pickerView.frame.origin.y-pickerView.frame.size.height,pickerView.frame.size.height)];
    }];
}

要在pickerView中加载数据：

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{

    return [currentArray count];
}


-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

-(NSString*)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
    return [currentArray objectAtIndex:row];
}

当用户选择pickerView中的行时,您将收到它作为委托方法.因此,只需将currentTextField的文本设置为所选值：

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    //and here you can do in two ways:
    //1
    [currentTextField setText:[currentArray objectAtIndex:row]];
    //2
    [currentTextField setText:[self pickerView:pickerView titleForRow:row inComponent:component]];
}