计时器模仿地球绕太阳圆周运动

向右看齐 2023-10-17 03:26 7阅读 0赞

模仿地球绕圆周运动

#define RADIUS  100
    #define CENTER_X  160
    #define CENTER_Y  240
    //宏定义 ： 单纯的替换 ，不会进行计算 ；
    #define   num  5+10
    #define sum(x,y)  (x+y)
    
    @interface ViewController ()
    
    @end
    
    @implementation ViewController
    {
        UIImageView *earth ;
    }
    - (void)viewDidLoad {
        [super viewDidLoad];
        UIImageView * sun = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"fireball"]];
        sun.center = CGPointMake(CENTER_X, CENTER_Y);
        sun.bounds = CGRectMake(0, 0, 62, 62);
        [self.view addSubview:sun];
        
        earth = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"a"]];
        earth.bounds = CGRectMake(0, 0, 30, 30);
        
        //角度  转化 为 弧度
        float huDu =  90/180.0 * M_PI ;
        //圆的参数方程
        //cos（弧度）
        float pointX =  CENTER_X + RADIUS * cos(huDu);
        float pointY =  CENTER_Y  +  1.5 * RADIUS * sin(huDu);
        
        earth.center = CGPointMake(pointX, pointY);
        [self.view addSubview:earth];
    
        NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(rotate) userInfo:nil repeats:YES];
        [[NSRunLoop currentRunLoop] addTimer:timer forMode:NSRunLoopCommonModes];
    }
    
    - (void)rotate
    {
        //修改 角度  ；
        static int angle = 90 ;
        angle ++ ;
        
        float huDu = angle/180.0 * M_PI ;
        //根据新的 弧度 ，计算 x、y坐标
        float pointX =  CENTER_X + RADIUS * cos(huDu)  ;
        float  pointY = CENTER_Y + 1.5 * RADIUS * sin(huDu)  ;
        
        earth.center = CGPointMake(pointX, pointY);
    }

效果图如下  
![Center][]

[Center]: https://img-blog.csdn.net/20160622211039921?watermark/2/text/aHR0cDovL2Jsb2cuY3Nkbi5uZXQv/font/5a6L5L2T/fontsize/400/fill/I0JBQkFCMA==/dissolve/70/gravity/Center