How to reset UIPickerView to index:0,iPhone

Question

I am trying to reset the UIPickerView on button click. My pickerview id is created at runtime, I have delegates set already. After googling, I found

[pickerView reloadAllComponents];

But this makes my app crash everytime it reaches here.

Object at index 0 is "Select from list" and then the items. When the submit button is clicked, I want that the "Select from list" should remain at the top of my label (selected index: 0).

Here is my code

ViewDidload

 pickerView = [[UIPickerView alloc] init];
    pickerView.delegate = self;
    pickerView.dataSource = self;

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


 // Total rows in our component.
    -(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{
        return [nameArray count];
    }

// Display each row's data.
-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component{
    return [nameArray objectAtIndex: row];
    }

// Do something with the selected row.

    -(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{
        dlbl.hidden=YES;
        NSLog(@"You selected this: %@", [nameArray objectAtIndex: row]);
        [btnSelectDesigner setTitle:[nameArray objectAtIndex: row] forState:UIControlStateNormal]; 

    }

and, on button click:

-(IBAction)btnSubmitClicked:(id)sender{
[pickerView reloadAllComponents];
}

Any idea what I'm doing wrong?

Thanks

Some code would help debug better. – Praveen S Jun 25 '12 at 14:18 — Praveen S, Jun 25 '12 at 14:18

score 32 · Accepted Answer · answered Jun 25 '12 at 14:22

32

[picker reloadAllComponents];
[picker selectRow:0 inComponent:0 animated:YES];

answered Jun 25 '12 at 14:22

Peter Warbo

11,136
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Can you explain the point of using reloadAllComponents please ? Thanks in advance :) – AnthoPak Mar 16 '18 at 14:16
1

@AnthoPak not sure why I needed to call that method 6 years ago but it shouldn't be necessary – Peter Warbo Mar 16 '18 at 15:00
Hahaha classic! – Justin Vallely Jan 03 '19 at 21:04

score 9 · Answer 2 · answered May 05 '16 at 20:59

9

Swift version:

picker.selectRow(0, inComponent: 0, animated: true)

answered May 05 '16 at 20:59

rgamber

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score 5 · Answer 3 · answered Jun 25 '12 at 14:27

5

//use this line for going at the top of the label index 0:

[picker selectRow:0 inComponent:0 animated:YES];

answered Jun 25 '12 at 14:27

Abhishek

2,255
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21

On button click? gives me crash – FirstTimer Jun 25 '12 at 14:47
1

Have you allocated your array?? is first time its working fine??..can you show your crash log here.. what is being happen exactly .. – Abhishek Jun 25 '12 at 15:02

How to reset UIPickerView to index:0,iPhone

3 Answers3