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[操作系统]【代码笔记】下拉菜单


一,效果图。

 

二,工程图。

三,代码。

RootViewController.h

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

 

RootViewController.m

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#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];}
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