PickerView is not showing - ios

Question

I'm trying to bring up a picker view instead of a keyboard to put in a textfield, but my picker view doesn't show.
#import "SettingsViewController.h"
#import "FindClasses.h"
#interface SettingsViewController ()
#property (weak, nonatomic) IBOutlet UIBarButtonItem *saveButton;
#property (weak, nonatomic) IBOutlet UITextField *classTextField;
#property (strong, nonatomic) UIPickerView *picker;
#property (nonatomic, strong) FindClasses *finder;
#property (nonatomic, strong) NSArray *itemsArray;
#end
#implementation SettingsViewController
- (void)viewDidLoad {
[super viewDidLoad];
NSArray *itemsArray = [self.finder findClassesInTimetable];
// Do any additional setup after loading the view.
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
- (void)presentPicker {
CGRect frame = CGRectMake(0, 40, 0, 0);
UIPickerView *picker = [[UIPickerView alloc] initWithFrame:frame];
picker.delegate = self;
picker.dataSource = self;
// TODO: animate this on screen
[self.view addSubview:picker];
}
- (void)textFieldDidBeginEditing:(UITextField *)textField {
[self presentPicker];
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
return [self.itemsArray count]; //where items is your array of items
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row inComponent:(NSInteger)component {
return [self.itemsArray objectAtIndex:row];
}
Can someone tell me what I'm doing wrong? I took the example from another Stackoverflow post:

Answer 1

This is how I use UIPickerViews, with sample code:
UIPickerView* genderPicker = [[UIPickerView alloc] init];
genderPicker.delegate = self;
genderPicker.dataSource = self;
After initializing your UITextField (registrationGenderField in my case):
registrationGenderField.inputView = genderPicker;
And then the delegates and dataSources:
- (NSString *) pickerView:(UIPickerView *)pickerView
titleForRow:(NSInteger)row
forComponent:(NSInteger)component {
switch (row) {
case 0:
return #"Gender";
break;
case 1:
return #"Male";
break;
case 2:
return #"Female";
break;
default:
return #"Gender";
break;
}
}
- (void) pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
switch (row) {
case 0:
registrationGenderField.text = #"";
break;
case 1:
registrationGenderField.text = #"Male";
break;
case 2:
registrationGenderField.text = #"Female";
break;
default:
registrationGenderField.text = #"";
break;
}
}
- (NSInteger) numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}
- (NSInteger) pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
return 3;
}

Answer 2

Hope it helps you
- (void)presentPicker {
UIPickerView *picker = [[UIPickerView alloc] init];
picker.delegate = self;
picker.dataSource = self;
// TODO: animate this on screen
classTextField .delegate = self;
classTextField.inputView = picker;
}
- (BOOL)textFieldShouldBeginEditing:(UITextField *)textField {
[textField becomeFirstResponder];
return YES;
}

Answer 3

you just have to alloc init your pickerview;
and set its delegate to self and also add uipickerviewdelegate and datasource in .h file
than in textfieldbegin editing add [textField setInputView:picker];
also implement textfieldshouldreturn