圆形跑马灯

---

 

 

 

#import <UIKit/UIKit.h>

 

@interface AppDelegate : UIResponder <UIApplicationDelegate>

{

    int k;

}

@property (strong, nonatomic) UIWindow *window;

 

 

@end

#import "AppDelegate.h"

@interface AppDelegate ()

@end

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {

    

    //[UIScreen mainScreen].bounds获取硬件设备的屏幕尺寸

    //backgroundColor 背景颜色

    //makeKeyAndVisible 让当前窗口展示在最前端

    

    self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];

    self.window.backgroundColor=[UIColor whiteColor];

    [self.window makeKeyAndVisible];

    

    

    int x=20,y=40,l=280;

    NSMutableArray *array=[NSMutableArray arrayWithObjects:[UIColor redColor],[UIColor orangeColor],[UIColor yellowColor],[UIColor greenColor],[UIColor blueColor],[UIColor cyanColor],[UIColor purpleColor], nil];

    for (int i=0; i<7; i++) {

        UIView *view=[[UIView alloc]initWithFrame:CGRectMake(x, y, l, l)];

        view.tag=i+100;

        view.backgroundColor=[array objectAtIndex:i];

        

        

        view.layer.masksToBounds = YES;//确定划圆

        view.layer.cornerRadius = view.frame.size.width/2;//确定半径

        [self.window addSubview:view];

        x+=20,y+=20,l-=40;

    }

    

    [NSTimer scheduledTimerWithTimeInterval:0.2f target:self selector:@selector(changeColor:) userInfo:array repeats:YES];

     return YES;

}

-(void)changeColor:(NSTimer *)timer

{

    NSMutableArray *colorArray=[timer userInfo];

    [colorArray addObject:[colorArray objectAtIndex:0]];

    [colorArray removeObjectAtIndex:0];

    for (int i=100; i<107; i++) {

        UIView *getView=[self.window viewWithTag:i];

        getView.backgroundColor=[colorArray objectAtIndex:i-100];

    }

    

}

@end