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  • UIVIew之霓虹灯实现

    //
    //  AppDelegate.m
    //  NiHongPractice
    //
    
    
    #import "AppDelegate.h"
    #define kColorValue arc4random_uniform(256) / 255.0
    #define kScreenWidth [UIScreen mainScreen].bounds.size.width
    #define kScreenHeight [UIScreen mainScreen].bounds.size.height
    
    
    @interface AppDelegate ()
    
    @end
    
    @implementation AppDelegate
    
    - (void)dealloc
    {
        self.window = nil;
        
        [super dealloc];
        
    }
    
    - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
        self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
        // Override point for customization after application launch.
        self.window.backgroundColor = [UIColor whiteColor];
        [self.window makeKeyAndVisible];
        
        
        for (int i  = 0; i < 11; i++) {
            
            UIView *view = [[UIView alloc] initWithFrame:CGRectMake(15*i, 15*i, kScreenWidth - 30 * i, kScreenHeight - 30 * i)];
            
            // 色值的范围(0~255)
            view.backgroundColor = [UIColor colorWithRed:kColorValue green:kColorValue blue:kColorValue alpha:1];
            
            view.tag = 200 + i;
            
            [self.window addSubview:view];
            
            [view release];
            
        }
    
        [NSTimer scheduledTimerWithTimeInterval:0.5 target:self selector:@selector(changeColor) userInfo:nil repeats:YES]; // 每过一秒去调用changeColor方法,进行一次颜色转换
        
        //[self changeColor];
        
        return YES;
    }
    
    - (void)changeColor {
        
        UIColor *color = [self.window viewWithTag:200 + 10].backgroundColor;
        
        for (int i = 10; i >= 0; i--) {
            
            [self.window viewWithTag:200 + i].backgroundColor = [self.window viewWithTag:200 + i - 1].backgroundColor; // 先创建的tag值小,结果显示为由外向里转换颜色
            
        }
        
        [self.window viewWithTag:200].backgroundColor = color;
        
    }
    
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  • 原文地址:https://www.cnblogs.com/yunji5566/p/5022423.html
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