Main.storyboardに 「image View」と「botton」を配置

ViewController.hにコネクト
[php]

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
@property (weak, nonatomic) IBOutlet UIImageView *myImageView;
– (IBAction)topBtn:(id)sender;
@end
[/php]

ViewController.mにボタンアクションを設定
[php]
– (IBAction)topBtn:(id)sender {
_myImageView.image = [UIImage imageNamed:@"child02.png"];
}
[/php]