Question

I want to display PickerView when I click the button.
I have a view which has 3 buttons. In the corresponding actions to the buttons, I have alloc’ed and init’ed the pickerView as follows:
pickerView = [[UIPickerView alloc]init];
Also I have added the PickerView to the Subview as follows:
[self.view addSubview:pickerView];

I’ve also subclass’ed my class with UIPickerViewDataSource and UIPickerViewDelegate as follows:
MyClass : UIViewController

By NSLoging i saw that PickerView DataSource and Delegate methods are not getting called.
When I click(TouchUpInside) the button, the view shows up pickerView with origin=(0,0) which should be at bottom and pickerView appears total Black. I fixed the PickerView’s frame by using:
pickerView.frame = CGRectmake(0,180,320,260);

I googled to check when the pickerView’s DataSource and Delegate method are called but I couldn’t find the proper answer.

I also tried the “hidden” property here as follow:
In viewDidLoad method:
pickerView.hidden = YES;
In the method which is called after clicking button:
pickerView.hidden = NO;

Help me please. I’m new to Objective C.

Answer 1

If you create your picker programmatically – did you actually set its delegate and dataSource?

// Assuming that delegate and data source is controller where picker is created
pickerView.delegate = self;
pickerView.dataSource = self;