Question

Ok I am having trouble figuring out how to approach this.

I have a UITextField which I add to a UITableView dynamically according to the definitions of a XML file, in the XML file I may specify a list as one of the data types and what I do then is add a UIPickerView that displays the list to the inputView of my specific UITextField.

What I am having trouble with is figuring out how to take the selected value from the UIPickerView and add it to the text property of my UITextField

My UIPickerView is a custom class but I added no extra functionality I only overrode it to make it possible to pass a datasource to the UIPickerView as a property.

Here is my PickerViewDataSourceAndDelegate.h

#import <Foundation/Foundation.h>

@interface PickerViewDataSourceAndDelegate : UIPickerView <UIPickerViewDelegate, UIPickerViewDataSource>

@property (nonatomic, strong) NSMutableArray *pickerData;

@end

And it’s .m file

#import "PickerViewDataSourceAndDelegate.h"

@implementation PickerViewDataSourceAndDelegate 

@synthesize pickerData;

-(id)init {
    if (self = [super init])
    {
        self.pickerData = [[NSMutableArray alloc] init];
    }
    return self;
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)thePickerView {

    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)thePickerView numberOfRowsInComponent:(NSInteger)component {
    return [self.pickerData count];
}

- (NSString *)pickerView:(UIPickerView *)thePickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    return [self.pickerData objectAtIndex:row];
}

@end

This is how I add the UITextField with the UIPickerView as inputView

    for(NodeProperty *nodeproperty in node.properties)
    {
        if(nodeproperty.flowDirection == (FlowDirection*)Output)
        {
            if([nodeproperty.typeName isEqualToString:@"System.String"] && nodeproperty.extendedType == (ExtendedType*)None && [nodeproperty.enumValues count] == 0)
            {
                ...
            }
            else if([nodeproperty.typeName isEqualToString:@"System.String"] && nodeproperty.extendedType == (ExtendedType*)MultilineText && [nodeproperty.enumValues count] == 0)
            {
                ...
            }
            else if([nodeproperty.typeName isEqualToString:@"System.Boolean"] && nodeproperty.extendedType == (ExtendedType*)None && [nodeproperty.enumValues count] == 0)
            {
                ...
            }
            else if([nodeproperty.typeName isEqualToString:@"System.Double"] && nodeproperty.extendedType == (ExtendedType*)None && [nodeproperty.enumValues count] == 0)
            {
                ...
            }
            else if([nodeproperty.typeName isEqualToString:@"System.String"] && nodeproperty.extendedType == (ExtendedType*)None && [nodeproperty.enumValues count] > 0)
            {
                UILabel *fieldLabel = [[UILabel alloc] initWithFrame:CGRectMake(5, 5, 290, 20)];
                fieldLabel.text = nodeproperty.name;
                [rowsInSectionLabels addObject:fieldLabel];

                PickerViewDataSourceAndDelegate *pickerDataDel = [[PickerViewDataSourceAndDelegate alloc] init];

                pickerDataDel.pickerData = nodeproperty.enumValues;
                pickerDataDel.dataSource = pickerDataDel;
                pickerDataDel.delegate = pickerDataDel;

                UITextField *textField = [[UITextField alloc] initWithFrame:CGRectMake(5, 25, 290, 30)];
                [textField setBorderStyle:UITextBorderStyleRoundedRect];
                textField.inputView = pickerDataDel;
                [rowsInSection addObject:textField];
            }
            else
            {
              ....

For space I omitted some of the space, if some things are unclear I will gladly explain.

Every thing works perfectly with no exceptions, I just want to get the selected value out of the picker

Answer 1

See the picker view delegate protocol. Implement this method:

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

In here, you can get the appropriate value from the model and update your text field.

To work out which is the current text field, you’d need to find out which of the text fields is the first responder.

Have all of the text fields in an IBOutletCollection or array, iterate through them and find the one which is first responder.

Or, if you have text field delegates, you can set an ivar for the current text field in the didBeginEditing delegate method, and use this in the picker view delegate method above.