NSTimer

#import "ViewController.h"
#import <QuartzCore/QuartzCore.h>
@interface ViewController ()
{

NSTimer *tiemer;
UIView *view;
UIView *yellowView;
}
@end
static BOOL left = NO;
static BOOL right = NO;
static BOOL top = NO;
static BOOL bottom = NO;
@implementation ViewController

- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
self.view.backgroundColor = [UIColor whiteColor];
[self creatView];

}
-(void)creatView
{
view = [[UIView alloc]init];
view.frame  = CGRectMake(self.view.frame.origin.x, self.view.frame.origin.y+64, 0.15*self.view.frame.size.height, 0.15*self.view.frame.size.width);
[view setBackgroundColor:[UIColor clearColor]];
UIImage *image = [UIImage imageNamed:@"2"];
UIImageView *imageview = [[UIImageView alloc]initWithFrame:CGRectMake(0, 0, 0.15*self.view.frame.size.height, 0.15*self.view.frame.size.width)];
[imageview setImage:image];
view.layer.masksToBounds = YES;
view.layer.cornerRadius = 0.5;
[view addSubview:imageview];
[self.view addSubview:view];

yellowView = [[UIView alloc]init];
yellowView.frame = CGRectMake(self.view.frame.origin.x+0.15*self.view.frame.size.height+10, self.view.frame.origin.y+64,  0.15*self.view.frame.size.width,  0.15*self.view.frame.size.height);
[yellowView setBackgroundColor:[UIColor yellowColor]];
[self.view addSubview:yellowView];

UIView *topView = [[UIView alloc]init];
topView.frame = CGRectMake(0, 0, 70, 20);
topView.backgroundColor = [UIColor blackColor];
[self.view addSubview:topView];
}
-(void) updateTime
{

CGRect rect = view.frame;
if (right ==NO && top == NO && bottom == NO)
{
rect.origin.x += 5;
if (rect.origin.x+(0.15*self.view.frame.size.width) >= 320)
{

right = YES;
}
}
if (bottom == YES && left == NO)
{
rect.origin.x -= 5;
rect.origin.y = self.view.frame.size.height - 0.15*self.view.frame.size.height;
if (rect.origin.x <= 0)
{
left = YES;
}

}
else if (left == YES)
{
rect.origin.x = 0;
rect.origin.y -= 5;
}
else if (right==YES)
{
rect.origin.y += 5;
rect.origin.x = 320-(0.15*self.view.frame.size.width);
if (rect.origin.y+0.15*self.view.frame.size.height >= self.view.frame.size.height)
{
bottom = YES;
}
}
view.frame = rect;
}

-(void) touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event
{
if (tiemer !=nil)
{
[tiemer invalidate];
tiemer = nil;
}

tiemer = [NSTimer scheduledTimerWithTimeInterval:0.05 target:self selector:@selector(updateTime) userInfo:nil repeats:YES];//重复运行
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end