获取UIPickerView的当前选定值

Question

我一直在谷歌搜索如何在UIPickerView中获取当前选择的值,但在任何地方都提到使用row:0等等.

我有一个UIPickerView填充了字符串值,如"一个","两个"等.

现在,当我选择一个值让我们说"两个"时,无论如何我可以得到这个文本.

就像在UITextView中一样,它是_textview.text

Answer 1

每个UIPickerView都应该有一个委托.

您可以通过以下方式向此代表询问您的选择器所选行标题:

  UIPickerViewDelegate *delegate = yourPickerView.delegate;
  NSString *titleYouWant = [delegate pickerView:yourPickerView titleForRow:[yourPickerView selectedRowInComponent:0] forComponent:0];

(这是假设您的组件编号为零;您自己的实现可能会有所不同).

有关" pickerView:titleForRow:forComponent"方法的更多文档可以在这里看到.

Answer 2

func pickerView(pickerView: UIPickerView!, didSelectRow row: Int, inComponent component: Int)
{
    // selected value in Uipickerview in Swift
    let value=array[row]
    println("values:----------\(value)");

}

Answer 3

首先在.h文件中添加UIPickerViewDatasource和UIPickerViewDelegate

然后在.m中添加该行

self.myPickerView.delegate = self;

现在按其对象分配数组.

NSArray *arrOfAge = [[NSArray alloc]initWithObjects:@“one”,@”two”, nil];

这是委托方法

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

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    return [arrOfAge count];
}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    NSString *titleRow;
    titleRow = [NSString stringWithFormat:@"%@", [arrOfAge objectAtIndex:row]];
    return titleRow;
}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{
    selectedRow = row;
}

此IBAction btnDone从pickerView返回选定的行.

- (IBAction)btnDone:(id)sender
{
    NSUInteger num = [[self.myPickerView dataSource] numberOfComponentsInPickerView:self.myPickerView];
    NSMutableString *text = [NSMutableString string];
    for(NSUInteger i =0;i<num;++i)
    {
        NSUInteger selectRow = [self.myPickerView selectedRowInComponent:i];
        NSString *ww = [[self.myPickerView delegate] pickerView:self.myPickerView titleForRow:selectRow forComponent:i];
        [text appendFormat:@"%@",ww];
        NSLog(@"%@",text);
    }
}