在单个选择器中选择的项目为null

Question

I have single picker when the user select type it will update label but when I select item it equal null to label

    //update label type
    NSInteger row  = [singlePicker selectedRowInComponent:0];
   NSString *selected = [pickerData objectAtIndex:row];
   NSString *strTypeSelected  = [[NSString alloc] initWithFormat:@"%@",selected];


    typelabel.text =strTypeSelected;

Answer 1

首先，请确保将插座和数据源提供给UIPickerView singlePicker对象，然后尝试使用此代码。

typelabel.text = [pickerData  objectAtIndex:[singlePicker selectedRowInComponent:0]];

Answer 2

Try This,

txtField1.text = [NSString stringWithFormat:@"%@",[arrData objectAtIndex:[picker selectedRowInComponent:0]]];

Check picker.delegate = self; in .m file -> viewDidLoad method.

Check in .h File

...Controller<UIPickerViewDataSource, UIPickerViewDelegate> {...

It may be help you.
Thanks.