objective c - Creating a delegate and dataSource for UIPickerView -

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I am trying to create a rep and a data source for a UIPickerView in a separate file. I have in ViewController: 

  - (zero) viewDidoadload {[Super Viewedload]; UIPickerView * myPickerView = [[UIPickerView alloc] initWithFrame: CGRectMake (0, 200, 320, 200)]; Month Picture * Month Picture = [[Month Picker Alok] Init]; MyPickerView.delegate = monthPicker; MyPickerView.dataSource = monthPicker; MyPickerView.showsSelectionIndicator = Yes; [Self.view addSubview: myPickerView]; }   
 MonthPicker.h  
  #import & lt; UIKit / UIKit.h & gt; @interface monthPicker: NSobes & lt; UIPickerViewDelegate, UIPickerViewDataSource & gt; @end   
 MonthPicker.m  
  #import "MonthPicker.h" @implementation MonthPicker - (NSInteger) pickerView: (UIPickerView *) pickerView numberOfRowsInComponent :( NSInteger) component {return 7; } - (NSInteger) numberOfComponentsInPickerView: (UIPickerView *) Pickbackview {return1; } - (NSString *) pickerView: (UIPickerView *) pickerView titleForRow: (NSInteger) forComponent: (NSInteger) component {"yyy" returned @; } @end   
 At this time I'm just using the placeholder values ​​to make a representative work. Everyting is compiled properly, but when I run the app and see that it's the picker to go to, it crashes with the 0 error message in the console  
 The only message I get is: Thread 1: EXC_BAD_ACCESS (code = 2, address = 0x0) but it does not help me at all.  
 I also tried to override the  dealloc  method in the delegation with an NSLog, and it appears that before the accident, it is removed, which is very strange to me looks like.  
 What am I missing?  
 Thank you.   
  itemprop = "text"> 
 The problem may be that at the end of viewDidLoad

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