objective-c - 从 UIPickerView 获取值

Question

我无法从 UIPickerView 获取初始值。

这是一些代码:

.......
#define kMaximumPlayers 15
......
   - (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
    {
        self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
        if (self) 
        {
            self.totalPlayersPossible = [NSMutableArray array];

            for (int x = 2; x < kMaximumPlayers; x++) 
            {
                [_totalPlayersPossible addObject:[NSNumber numberWithInt:x]];
            }
        }
        return self;
    }


    - (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
    {
        return [NSString stringWithFormat:@"%@", [self.totalPlayersPossible objectAtIndex:row]];


    - (void)viewDidLoad
    {
        [super viewDidLoad];
        [self.pickverView selectRow:0 inComponent:0 animated:YES];
    }
 }

当我运行应用程序时，UIPickerView 的第一行被选中。问题是我无法获取该行的值:

   - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component
    {
//here I get the value of selected row

       [self setNumberOfSelectedPlayers:[[self.totalPlayersPossible objectAtIndex:row]intValue]];
    }

The value of setNumberOfSelectedPlayers is 0.

我在这里想念什么？

Answer 1

正如 Novarg 所说，didSelectRow: 消息不会在加载时调用。不过，您可以直接调用 pickerView: titleForRow: inComponent 消息，以随时获取当前所选项目的标题。假设您想要的标题位于选择器 View 的第一个“卷轴”(组件)中:

NSString *initialTitle = [self pickerView:self.pickerView
                              titleForRow:[self pickerView selectedRowInComponent:0]
                             forComponent:0 
];

当然，这假定 self 作为 pickerView 的 UIPickerViewDelegate。