iphone - 如何让我的 UIPickerView 在选定值之后显示标签？

Question

现在，选择器只显示被选择的数据。我希望它在所选值之后有一个词，就像 iPhone 时钟应用程序在选择器上有“小时”和“分钟”一样。

Answer 1

在这里，我得到了这个问题的正确答案(我已经为一个 component 做了，根据你的要求改变它)看看: 你需要实现这个方法:

-(UIView *)pickerView:(UIPickerView *)pickerView viewForRow:(NSInteger)row forComponent:(NSInteger)component reusingView:(UIView *)view
{
   //set your View. Here is an example .. 
UIView *pickerviewtemp=[[UIView alloc] initWithFrame:CGRectZero];

    UILabel *lbl=[[[UILabel alloc] initWithFrame:CGRectMake(0, 0, 100, 50)]autorelease];
    [lbl setBackgroundColor:[UIColor clearColor]];
    [lbl setText:[array_from objectAtIndex:row]];
    [lbl setFont:[UIFont boldSystemFontOfSize:16]];
    [pickerviewtemp addSubview:lbl];


    return pickerviewtemp;

}

在 .h 文件中取一个 int 变量命名为 lastSelectedIndex

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
{  
    UILabel *label = (UILabel*)[pickerView viewWithTag:999+(component*lastSelectedIndex)]; // you can set your own tag...
    [label removeFromSuperview];
    UIView *view = [pickerView viewForRow:row forComponent:component];
    UILabel *lbl2=[[[UILabel alloc] initWithFrame:CGRectMake(110, 0, 50, 50)]autorelease];
    lbl2.tag =  999+(component*row);
    [lbl2 setBackgroundColor:[UIColor clearColor]];
    [lbl2 setText:@yourtext"];
    [lbl2 setFont:[UIFont boldSystemFontOfSize:16]];
    [view addSubview:lbl2];
    lastSelectedIndex = row;
}

我已经测试过了。希望它能帮助你.... :)