学步园

通过UIview多视图的叠加，灵活利用UIView的属性值，NStimer的控制，输出多彩的霓虹灯效果

前半部分，UIView的实现并不难，代码也很好理解

@interface RootViewController ()
{

UIView *aView;
UIView *bView;
UIView *cView;
UIView *dView;
UIView *eView;
UIView *fView;
UIView *gView;
}
@end
- (void)viewDidLoad
{
[super viewDidLoad];
aView=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 320, 460)];
[aView setBackgroundColor:[UIColor redColor]];
[self.view addSubview:aView];
[aView release];

bView=[[UIView alloc]initWithFrame:CGRectMake(20, 20, 280, 420)];
[bView setBackgroundColor:[UIColor blueColor]];
[aView addSubview:bView];
[bView release];

cView=[[UIView alloc]initWithFrame:CGRectMake(20, 20, 240, 380)];
[cView setBackgroundColor:[UIColor greenColor]];
[bView addSubview:cView];
[cView release];

dView=[[UIView alloc]initWithFrame:CGRectMake(20, 20, 200, 340)];
[dView setBackgroundColor:[UIColor orangeColor]];
[cView addSubview:dView];
[dView release];

eView=[[UIView alloc]initWithFrame:CGRectMake(20, 20, 160, 300)];
[eView setBackgroundColor:[UIColor purpleColor]];
[dView addSubview:eView];
[eView release];

UIView一旦固定好，就view之间的交互，不断向外扩展

先设定一个nstimer 时间控制器都写在viewdidload里面

NSTimer *t=[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(Go:) userInfo:nil repeats:YES];

然后是Go：的方法实现

-(void)Go:(id)sender
{
UIView *changeView=[[UIView alloc]init];
changeView.backgroundColor=aView.backgroundColor;
aView.backgroundColor=bView.backgroundColor;
bView.backgroundColor=cView.backgroundColor;
cView.backgroundColor=dView.backgroundColor;
dView.backgroundColor=eView.backgroundColor;
eView.backgroundColor=changeView.backgroundColor;
}

随着时间的移动，通过一个中间变量，实现每个视图之间的交换。