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#import "timerViewController.h"
@interface timerViewController ()
{
NSTimer *timerTaks;
int CountdownInt;
UILabel *labCountdown;
}
@end
@implementation timerViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor=[UIColor whiteColor];
CountdownInt=0;
labCountdown=[[UILabel alloc]initWithFrame:CGRectMake(30, 100, 50, 40)];
labCountdown.backgroundColor=[UIColor yellowColor];
labCountdown.textColor=[UIColor redColor];
[self.view addSubview:labCountdown];
timerTaks = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(CountdownTimeer) userInfo:nil repeats:YES];
}
-(void)CountdownTimeer
{
CountdownInt++;
if (CountdownInt==60) {
[timerTaks invalidate];
labCountdown.hidden = YES;
CountdownInt = 0;
}else
{
labCountdown.text = [NSString stringWithFormat:@"%ds",60-CountdownInt];
}
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
/*
#pragma mark - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
// Get the new view controller using [segue destinationViewController].
// Pass the selected object to the new view controller.
}
*/
@end
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原文地址：http://www.cnblogs.com/gzz2016/p/5110686.html
