iOS UI-Lable标签、NStimer定时器和RunLoop超级死循环

     // 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];
 }