屏幕颜色闪烁
@implementation AppDelegate
- (void)dealloc
{
[_window release];
[super dealloc];
}
NSInteger a = 5;
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
self.window.backgroundColor = [UIColor whiteColor];
[self.window makeKeyAndVisible];
[_window release];
view = [[UIView alloc]initWithFrame:[UIScreen mainScreen].bounds];
view.backgroundColor = [UIColor yellowColor];
[self.window addSubview:view];
view.center = self.window.center;
//(定时器)
[NSTimer scheduledTimerWithTimeInterval:1 target:self selector:@selector(change1) userInfo:nil repeats:YES];
[NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(changeColor) userInfo:nil repeats:YES];
[view release];
lable = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, 100, 50)];
lable.backgroundColor = [UIColor redColor];
[view addSubview:lable];
lable.center = view.center;
lable.layer.borderColor = [UIColor blackColor].CGColor;
lable.layer.borderWidth = 2;
lable.layer.cornerRadius = 10;
lable.layer.masksToBounds = YES;
[lable release];
return YES;
}
- (void)change1
{
if (a > 0) {
NSString *str = [NSString stringWithFormat:@"%ld", a];
lable.text = str;
lable.font = [UIFont boldSystemFontOfSize:40.0];
lable.textAlignment = NSTextAlignmentCenter;
}
if (a == 0) {
lable.text = @"闪瞎你";
lable.font = [UIFont boldSystemFontOfSize:30.0];
lable.textAlignment = NSTextAlignmentCenter;
lable.textColor = [UIColor blueColor];
}
a--;
}
- (void)changeColor
{if (a < 0){
view.backgroundColor = [UIColor redColor];
int a = arc4random()%(255 + 1);
int b = arc4random()%(255 + 1);
int c = arc4random()%(255 + 1);
view.backgroundColor = [UIColor colorWithRed:a/255.0 green:b/255.0 blue:c/255.0 alpha:1];}
}