在ui学习，用简单地uiView和视图控制器制作的霓虹灯效果，在这个过程中要学会使用定时器NSTimer的开启与关闭，这个是实现动态效果的关键一步，在使用时可以查看API文档查看，也可以上网查询；
初始化
+ (NSTimer *)timerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)yesOrNo;
(NSTimer *)scheduledTimerWithTimeInterval:(NSTimeInterval)ti target:(id)aTarget selector:(SEL)aSelector userInfo:(id)userInfo repeats:(BOOL)yesOrNo;
//开启定时器[_timer setFireDate:[NSDate distantPast]];
//暂停定时器[_timer invalidate];
这里timer的内存并没有释放，如果释放了可能造成程序崩溃，这是我现在没有解决的
(http://img./1121174843569)- (void)viewDidLoad {[super viewDidLoad];// Do any additional setup after loading the view.//布局子视图for (int i = 0; i < 10; i ++) {UIView *view = [[UIView alloc] initWithFrame:CGRectMake ( 15 +15*(i + 1), 15 * (i +1), 300 - i * 30, 600 -i *30 )] ;[self.view addSubview:view];view.backgroundColor = [UIColor colorWithRed:KColorKey green:KColorKey blue:KColorKey alpha:1.0];view.tag = 100 + i;[view release];}//添加按钮UIButton *btn = [UIButton buttonWithType:UIButtonTypeSystem];btn.frame = CGRectMake(80, 620, 80, 40);btn.backgroundColor = [UIColor greenColor];[btn setTitle:@"开始" forState:UIControlStateNormal];[btn addTarget:self action:@selector(begin:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:btn];UIButton *btn1 = [UIButton buttonWithType:UIButtonTypeSystem];btn1.frame = CGRectMake(180, 620, 80, 40);btn1.backgroundColor = [UIColor greenColor];[btn1 setTitle:@"取消" forState:UIControlStateNormal];[btn1 addTarget:self action:@selector(stop:) forControlEvents:UIControlEventTouchUpInside];[self.view addSubview:btn1];}//开始事件- (void)begin: (UIButton *)btn {//添加定时器_timer = [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(fromout) userInfo:nil repeats:YES];//开启定时器[_timer setFireDate:[NSDate distantPast]];}//实现事件//从里向外- (void)fromout {UIColor *tem = [self.view viewWithTag:100].backgroundColor;for (int i = 100; i < 110; i ++) {[self.view viewWithTag:i].backgroundColor = [self.view viewWithTag:i+ 1].backgroundColor;}[self.view viewWithTag:100 + 9].backgroundColor = tem;//从外向里// UIColor *temp = [self.view viewWithTag:100 + 9].backgroundColor;// for (int i = 100 + 9; i >= 100; i--) {// [self.view viewWithTag:i].backgroundColor = [self.view viewWithTag:i-1].backgroundColor;// }// [self.view viewWithTag:100].backgroundColor = temp;}- (void)stop: (UIButton*) btn {//暂停定时器[_timer invalidate];}@end
