#import <UIKit/UIKit.h> @interface ViewController : UIViewController <UIPickerViewDelegate> @end #import "ViewController.h" @interface ViewController () @property (weak, nonatomic) IBOutlet UIPickerView *picker; @end @implementation ViewController { NSArray* categoryArray; } - (void)viewDidLoad { [super viewDidLoad]; // pickerdelegateの設定 self.picker.delegate = self; //カテゴリを配列に categoryArray = [NSA