利用NStimer制作UILabel跑马灯效果

#import "ViewController.h"

@interface ViewController ()

@end

UILabel *mylabel;

@implementation ViewController

static int num=0;
-(void)timerAction:(NSTimer *)time{
num ++;
NSLog(@"Hi");
[mylabel removeFromSuperview];
CGRect workingFrame;
workingFrame.size.height=20;
workingFrame.size.width=600;
workingFrame.origin.x=430-num;
workingFrame.origin.y=400;

mylabel=[[UILabel alloc]initWithFrame:workingFrame];
mylabel.text=@"Hello world 01，Hello world 02，Hello world 03，Hello world 04";

mylabel.font=[UIFont systemFontOfSize:17];
[mylabel setBackgroundColor:[UIColor clearColor]];
[self.view addSubview:mylabel] ;

if (num==1100) {
{
num=0;
}
}

}

- (void)viewDidLoad {
[super viewDidLoad];

[NSTimer scheduledTimerWithTimeInterval:0.025 target:self selector:@selector(timerAction:) userInfo:nil repeats:YES];

}

@end