[Code notes] drop-down menu and note drop-down menu

[Code notes] drop-down menu and note drop-down menu

I ,.

 

2. Engineering Drawing.

3. Code.

RootViewController. h

#import <UIKit/UIKit.h>@interface RootViewController : UIViewController@end

 

RootViewController. m

#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];}