A 1.4. Picking Values with the UIPickerView

First let’s go to the top of the .m (implementation) file of our view controller and define our picker view:

#import "ViewController.h"
@interface ViewController ()  <UIPickerViewDataSource, UIPickerViewDelegate>
@property (nonatomic, strong) UIPickerView *myPicker;
@property (nonatomic,copy) NSArray *myarray;
@end

Now let’s create the picker view in the viewDidLoad method of our view controller:

- (void)viewDidLoad
{
    [super viewDidLoad];

    self.myPicker = [[UIPickerView alloc] init];
    self.myPicker.dataSource = self;
    self.myPicker.delegate = self;
    self.myPicker.center = self.view.center;
    self.myPicker.showsSelectionIndicator = YES;
    [self.view addSubview:self.myPicker];

    self.myarray = [[NSArray alloc] initWithObjects:@"hello",@"how",@"are",@"you", nil];
}

- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    if ([pickerView isEqual:self.myPicker])
    {
        return 1;
    }
    return 0;
}

-(NSInteger) pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
    if ([pickerView isEqual:self.myPicker])
    {
        return [self.myarray count];
    }
    return 0;
}


- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{

    if ([pickerView isEqual:self.myPicker])
    {
        return [NSString stringWithFormat:@"%@",self.myarray[row]];

    }
    return nil;
}