// 标签UILable -显示文字

     // 1.创建标签

     UILabel *lable = [[UILabel alloc] init];

     // 2.设置标签的坐标和大小

     [lable setFrame:CGRectMake(,, , )];

     // 3.标签内容

     lable.text = @"";

     // 设置字体

     lable.font = [UIFont systemFontOfSize:];

     // 设置字体颜色

     lable.textColor = [UIColor blackColor];

     // 设置内容换行

     lable.numberOfLines = ;

     //设置圆角

     lable.layer.cornerRadius = ;

     lable.layer.masksToBounds = NO;

     // 设置标签内容居中

     lable.textAlignment = NSTextAlignmentCenter;

     // 设置标签背景

     lable.backgroundColor = [UIColor blackColor];

     // 加载图片

     UIImageView *tempView = [[UIImageView alloc] init];

     [tempView setFrame:CGRectMake(, , , )];

     tempView.image = [UIImage imageNamed:@"1.png"];

     // 4.在当前视图之上加载子视图

     [self.view addSubview:lable];

     [lable addSubview:tempView];

 #import "ViewController.h"

 @interface ViewController ()

 {

     NSTimer *timer;

     NSInteger length;

 }

 @property (weak, nonatomic) IBOutlet UILabel *lable;

 @end

 @implementation ViewController

 -(void) lableMove

 {

     if (self.lable.frame.origin.y>) {

         length = -;

     }

     else if (self.lable.frame.origin.y<)

     {

         length = ;

     }

     CGRect rect = self.lable.frame;

     rect.origin.y +=length;

     self.lable.frame = rect;

     if (self.lable.frame.origin.y>) {

         [timer invalidate];

         [self.lable removeFromSuperview];

     }

 }

 - (void)viewDidLoad {

     [super viewDidLoad];

     /*

      NSTimeInterval 计时器响应时间间隔

      target：计时器的响应者

      selector：计时器的响应方法

      userInfo：nil

      repeats：计时器是否重复响应

      */

     length = ;

     timer = [NSTimer timerWithTimeInterval:0.1 target:self selector:@selector(lableMove) userInfo:nil repeats:YES];

     //将定时器插入runLoop（超级死循环）中

     [[NSRunLoop currentRunLoop]  addTimer:timer forMode:NSRunLoopCommonModes];

 }