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[操作系统]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;  }