【代码笔记】iOS-下拉菜单

#import <UIKit/UIKit.h>

@interface RootViewController : UIViewController

@end

#import "RootViewController.h"
#import "NIDropDown.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.title=@"DropDown";

UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame=CGRectMake(10, 100, 150,30);
button.backgroundColor=[UIColor redColor];
[button addTarget:self action:@selector(doClickAction:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:button];

}
-(void)doClickAction:(UIButton *)btn
{
NSArray *dataArray=[NSArray arrayWithObjects:@"1",@"2",@"3",@"4",@"5", nil];

NIDropDown *dropDown=[[NIDropDown alloc]init];
[dropDown showDropDown:btn andHeight:[dataArray count]*36 andData:dataArray];
[self.view addSubview:dropDown];
}