When move values in uipickerview faster than something went wrong

I am having a UITextField and replacing iPhone keyboard with UIPickerView having 3 to 4 components in a row, the problem i am fac开发者_Python百科ing is that when i move values of 3 or 4 components faster as much as i can the event - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component is fired one, and only value of just one component is updated which was selected at last. How can i fix it ? is there any method other than - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component to overcome this problem?

thanks

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problem can be solve using if conditions. like:

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component

{
    if(component == 0)
    {
    }
    if(component == 1)
    {
    }
    if(component == 2)
    {
    }
}

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Zohaib, if I understand correctly you're scrolling through 3 or 4 components very quickly is it? The method - (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component as far as I know is fired when a row is actually selected, i.e. a scroll ends at this particular row and it is therefore 'selected'. So, I'd assume its correct in being called only once. I assume you're not scrolling-then-stopping and doing that several times?

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I faced the same problem of having multiple components scrolling at the same time, in the end only one selected value is detected.

I found a solution mentioned by someone in Apple discussion.

- (NSInteger)selectedRowInComponent:(NSInteger)component

Instead of relying on the row component value return by the picker, use above method to find each selected value in your picker and update accordingly.

Hope it helps

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This is a problem with iOS 7. I was able to reproduce this in a test app with a picker with only 1 component. The trick is to get the picker going really fast so there's a big bounce at the end (sometimes a double or triple swipe is needed). It only happens about 1 time in 10 and I can't seem to get it to happen on the iPhone. I have however seen it on both the simulator in Xcode 5.0 and my iPad mini with Retina Display running 7.0.6.

https://dl.dropboxusercontent.com/u/36715615/UIPickerViewTest.zip