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  • IOS 霓虹灯简单小程序

    在RootViewController.m文件中

    - (void)viewDidLoad//视图加载方法

    - (void)viewDidLoad
    {
        
        //设置红色
        UIView *viewRed = [[UIView alloc]initWithFrame:CGRectMake(100, 100, 120, 30)];
        viewRed.backgroundColor = [UIColor redColor];
        [self.view addSubview:viewRed];
        
        //设置橙色
        UIView *viewOrange = [[UIView alloc]initWithFrame:CGRectMake(100, 130, 120, 30)];
        viewOrange.backgroundColor = [UIColor orangeColor];
        [self.view addSubview:viewOrange];
        
        //设置黄色
       
        UIView *viewYellow = [[UIView alloc]initWithFrame:CGRectMake(100, 160, 120, 30)];
        viewYellow.backgroundColor = [UIColor yellowColor];
        [self.view addSubview:viewYellow];
        
        //设置绿色
        UIView *viewGreen = [[UIView alloc]initWithFrame:CGRectMake(100, 190, 120, 30)];
        viewGreen.backgroundColor = [UIColor greenColor];
        [self.view addSubview:viewGreen];
        
        //设置青色
        UIView *viewGray = [[UIView alloc]initWithFrame:CGRectMake(100, 220, 120, 30)];
        viewGray.backgroundColor = [UIColor grayColor];
        [self.view addSubview:viewGray];
        
        //设置蓝色
        UIView *viewBlue = [[UIView alloc]initWithFrame:CGRectMake(100, 250, 120, 30)];
        viewBlue.backgroundColor = [UIColor blueColor];
        [self.view addSubview:viewBlue];
    
        //设置紫色
        UIView *viewPurple = [[UIView alloc]initWithFrame:CGRectMake(100, 280, 120, 30)];
        viewPurple.backgroundColor = [UIColor purpleColor];
        [self.view addSubview:viewPurple];
        
        //设置按钮
        UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
        button.frame = CGRectMake(100, 330, 120, 30);
        [button setTitle:@"开始" forState:UIControlStateNormal];
        button.backgroundColor = [UIColor blackColor];
        button.tag = 108;
        [button addTarget:self action:@selector(btnAction:) forControlEvents:UIControlEventTouchUpInside];
        [self.view addSubview:button];
        
        [super viewDidLoad];
        // Do any additional setup after loading the view.
    }

    在关联方法btnAction中:

     timer为全局变量

     可以在RootViewController.h文件中定义;

    -(void)btnAction:(id)sender
    {
        UIButton *button = (UIButton*)sender;
        if (button.tag ==108) {
            timer = [NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(doChangeColor:) userInfo:nil repeats:YES];
            [timer fire];//计时器开始
        }
        
    }

    在关联方法doChangeColor中:

    -(void)doChangeColor:(id)sender
    {
        NSArray *arr = self.view.subviews;//得到所有的视图
        int count = [arr count]-1;//得到计数
        UIView *firstView = [arr objectAtIndex:0];
        UIColor *firstColor = firstView.backgroundColor;
        
        for (int i=0; i<count; i++) {
            UIView *view = [arr objectAtIndex:i];
            UIView *nextView = [arr objectAtIndex:(i+1)];
            view.backgroundColor = nextView.backgroundColor;
        }
        ((UIView*)[arr objectAtIndex:count]).backgroundColor = firstColor;
        self.view.backgroundColor = [UIColor colorWithRed:(arc4random()%255/255.0) green:(arc4random()%255/255.0) blue:(arc4random()%255/255.0) alpha:(arc4random()%255/255.0)];
        
    }

    结果显示:

     

     会不断的改变背景图片,和实现了霓虹灯的效果。

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  • 原文地址:https://www.cnblogs.com/taopengcun/p/3709728.html
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