#import <UIKit/UIKit.h>//加入頭文件#import "ComboBoxView.h"@interface RootViewController : UIViewController{  ComboBoxView    *_comboBox;}@end 

#import "RootViewController.h"@interface RootViewController ()@end@implementation RootViewController- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{  self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];  if (self) {    // Custom initialization  }  return self;}- (void)viewDidLoad{  [super viewDidLoad];  // Do any additional setup after loading the view.    self.navigationController.navigationBarHidden=YES;      NSArray *comboBoxDatasource = [[NSArray alloc] initWithObjects:@"one", @"two", @"three", @"four", @"five", @"six", @"seven", @"eight", nil];  _comboBox = [[ComboBoxView alloc] initWithFrame:CGRectMake(20, 20, 280, 140)];  _comboBox.comboBoxDatasource = comboBoxDatasource;  _comboBox.backgroundColor = [UIColor clearColor];  [_comboBox setContent:[comboBoxDatasource objectAtIndex:0]];  [self.view addSubview:_comboBox];    }