将UIPicker数据存储在NSDictionary中

Question

我在Master-Detail视图中有一个包含＆＃39;类别＆＃39;的UIPicker。我想设置＆＃39;类别＆＃39;到该项目的NSDictionary。 NSDictionary包含标题为＆＃39;标题的项目。 ＆＃39;量＆＃39;和＆＃39;类别＆＃39;。

如何将UIPicker数据提供给NSDictionary？

- (IBAction)categoryTextChanged:(UITextField *)sender {
    [self.category setObject:sender.text forKey:@"category"];
- (void)configureView
{
    // Update the user interface for the detail item.
    if (self.item)
        self.itemText.text = [self.item objectForKey:@"item"];
    if (self.quantity)
        self.quantityText.text = [self.quantity objectForKey:@"quantity"];
    if (self.category){
        self.categoryText.text = [self.category objectForKey:@"category"];
        //self.categoryTextLabel.text = [self.category objectForKey:@"category"];
    }

}
- (void)setCategory:(id)newCategory
{
    if (_category != newCategory) {
        _category = newCategory;
        // Update the view.
        [self configureView];
    }
}