创建VC，在VC的viewdidload中创建显示Label，和触发按钮，具体实现步骤如下：
- (void)viewDidLoad {
[super viewDidLoad];
[self loadData];
self.view.backgroundColor=[UIColor whiteColor];
label = [[UILabel alloc]initWithFrame:CGRectMake(0, 200, self.view.frame.size.width, 60)];
label.text = @"七夕送什么礼物";
label.textAlignment = NSTextAlignmentCenter;
label.font = [UIFont boldSystemFontOfSize:50];
label.textColor = [UIColor orangeColor];
label.backgroundColor = [UIColor clearColor];
[self.view addSubview:label];
UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];
button.frame = CGRectMake((self.view.frame.size.width-100)/2, 500, 100, 40);
[self.view addSubview:button];
[button setTitle:@"开始选" forState:UIControlStateNormal];
button.backgroundColor = UIColorFromRGB(0x4fba33);
button.showsTouchWhenHighlighted = YES;
[button setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
[button addTarget:self action:@selector(push:) forControlEvents:UIControlEventTouchUpInside];
timer = [NSTimer scheduledTimerWithTimeInterval:0.001 target:self selector:@selector(loadData) userInfo:nil repeats:YES];
[[NSRunLoop currentRunLoop ]addTimer:timer forMode:NSDefaultRunLoopMode];
timer.fireDate = [NSDate distantFuture];
}
- (void)loadData
{
NSUserDefaults *userDefaults = [NSUserDefaults standardUserDefaults];
nameList = [NSMutableArray arrayWithObjects:@"包包",@"nike",@"阿迪达斯",@"衣服",@"化妆品",@"香水",@"补水霜",@"香薰",@"绣眉笔",@"项链",@"手表",@"手环",@"项链",@"手镯",@"戒指",@"爱疯7普拉斯",@"macPro",@"MK",@"路易威登",@"车",@"房",@"啥都不要",@"1000块",@"100块",@"大吃一顿",@"出去玩一趟",@"鲜花",@"ipad",@"游戏机",@"挂件",@"装饰品",@"背包",@"单肩包",@"裙子",@"帽子",@"扎花",@"拖鞋",@"睡衣",@"美食",@"小摩托",@"自行车",@"滑板车", nil];
[userDefaults setObject:nameList forKey:@"nameList"];
[userDefaults synchronize];
[userDefaults objectForKey:@"nameList"];
int arcNumber = arc4random()%nameList.count;
label.text = nameList[arcNumber];
label.textColor= UIColorFromRGB(0x4fba33);
}
- (void)push:(UIButton *)sender{
if (sender.selected !=YES ) {
label.textColor = [UIColor clearColor];
[sender setTitle:@"暂停" forState:UIControlStateNormal];
timer.fireDate = [NSDate distantPast];
sender.selected = YES;
}else{
[SVProgressHUD showInfoWithStatus:@"好了，那就这个吧"];
timer.fireDate = [NSDate distantFuture];
label.textColor = [UIColor blackColor];
[sender setTitle:@"开始选" forState:UIControlStateNormal];
sender.selected = NO;
}
}
- (void)showAlertMessage:(NSString *)message
{
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:@"真的是你" message:message delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil, nil];
[alert show];
}
以上就是适用于随机点名，随机抽奖功能，个人意见，不喜勿喷，交流心得。
附上github地址：https://github.com/zhaoMrPlus/Randomdraw
