iphone - 围绕圆周移动 UIImageView？

Question

我目前正在为 iphone 开发一款游戏，其中许多图像将围绕圆圈旋转。我已经达到了必须编写代码来实现这一点的地步。我对必须使用哪些数学运算以及如何实现这一点感到困惑。如果可以使用代码示例解释该过程，那将非常有帮助。如果有人对我的意思感到困惑，我只是想以恒定的速度围绕圆周移动 UIImageView 的中心。任何帮助表示赞赏。:)

Answer 1

CGRect rect1; CGRect rect2; CGRect rect3;....

在 viewdidload() {

rect1 = imageView1.frame
rect2 = imageView2.frame;
rect3 = imageView3.frame;



[UIImageView beginAnimations:nil context:nil];




[UIImageView setAnimationDelegate:self];
[UIImageView setAnimationBeginsFromCurrentState:YES];
[UIImageView setAnimationDuration:1.5];
[UIImageView setAnimationDidStopSelector:@selector(rotate:)];

imageView1.center = CGPointMake(rect2.origin.x, rect2.origin.y);
imageView1.transform = CGAffineTransformMakeScale(1.2, 1.2);
imageView2.center = CGPointMake(rect3.origin.x, rect3.origin.y);
imageView2.transform = CGAffineTransformMakeScale(2, 2);
    [UIImageView commitAnimations];
     }

- (void)rotate:(NSString *)animationID
   {
[UIImageView beginAnimations:nil context:nil];
[UIImageView setAnimationDelegate:self];
[UIImageView setAnimationBeginsFromCurrentState:YES];
[UIImageView setAnimationDuration:1.5];
[UIImageView setAnimationDidStopSelector:@selector(rotate1:)];

imageView1.center = CGPointMake(rect3.origin.x, rect3.origin.y);
imageView1.transform = CGAffineTransformMakeScale(2, 2);
imageView1.alpha = 1;
imageView2.center = CGPointMake(rect4.origin.x, rect4.origin.y);
imageView2.transform = CGAffineTransformMakeScale(1.2, 1.2);
imageView2.alpha = .5;
    .....
   [UIImageView commitAnimations];
     }

     - (void)rotate1:(NSString *)animationID
    {
[UIImageView beginAnimations:nil context:nil];
[UIImageView setAnimationDelegate:self];
[UIImageView setAnimationBeginsFromCurrentState:YES];
[UIImageView setAnimationDuration:1.5];
[UIImageView setAnimationDidStopSelector:@selector(rotate2:)];

imageView1.center = CGPointMake(rect4.origin.x, rect4.origin.y);
imageView1.transform = CGAffineTransformMakeScale(1.2, 1.2);
imageView1.alpha = .5;
imageView2.center = CGPointMake(rect5.origin.x, rect5.origin.y);
imageView2.transform = CGAffineTransformMakeScale(1, 1);
imageView2.alpha = .15;
     ....
    [UIImageView commitAnimations];
      }

     try like this