#import "ViewController.h"
#define kColorValue arc4random_uniform(256) / 255.0
#define kScreenWidth [UIScreen mainScreen].bounds.size.width
#define kScreenHeight [UIScreen mainScreen].bounds.size.height
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
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.view addSubview:view];
// Do any additional setup after loading the view, typically from a nib.
}
[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];
}
- (void)changeColor {
UIColor *color = [self.view viewWithTag:200 + 10].backgroundColor;
for (int i = 10; i >= 0; i--) {
[self.view viewWithTag:200 + i].backgroundColor = [self.view 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.view viewWithTag:200].backgroundColor = color;
}