ios/xcode/objective-c: UIPickerView Not Displaying - ios

Question

I have a UIPickerView that shows up in storyboard but is invisible or at best a colored block if I change the background color when I compile the program. Do I need to populate it with data for it to display, i.e. does it no longer show Cupertino, Mountain View etc. once compiled?
BTW, I am trying to populate picker view with data but still invisible:
code:
in .h file:
#interface pickerVC : UIViewController<UIPickerViewDelegate,UIPickerViewDataSource>
#property (weak, nonatomic) IBOutlet UIPickerView *pickerView;
#property (strong, nonatomic) IBOutlet UILabel *color;
#property (strong, nonatomic) NSArray *myArray;
in viewdidload;
UIPickerView *pickerView;
pickerView.delegate = self;
_myArray = [[NSArray alloc] initWithObjects:#"Blue",#"Green",#"Orange",#"Purple",#"Red",#"Yellow" , nil];
//PICKER METHODS
// tell the picker how many rows are available for a given component
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
// NSUInteger numRows = 3;
return _myArray.count;
}
// tell the picker how many components it will have
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
return 1;
}
// tell the picker the title for a given component
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
NSString *title;
title = _myArray[row];
return title;
}
// tell the picker the width of each row for a given component
- (CGFloat)pickerView:(UIPickerView *)pickerView widthForComponent:(NSInteger)component {
int sectionWidth = 300;
return sectionWidth;
}
- (void)pickerView:(UIPickerView *)pickerView didSelectRow: (NSInteger)row inComponent:(NSInteger)component{
NSLog(#"Selected Row %d", row);
switch(row){
// Handle the selection
}

Answer 1

yes, you need to implement the data source and picker view delegates.

Answer 2

Yes it is not displaying. You have to set delegate and datasource of picker view and implement delegate methods in your controller.m file.
e.g.
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return 10;
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
return #"ABC";
}

Answer 3

First of all add this
<UIPickerViewDelegate,UIPickerViewDataSource> in your .h file
after that add there Delegate Methods
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
return 1;
}
- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component
{
return 5;
}
- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{
return #"xyz";
}