使用計時器逐漸旋轉UIImageView

Question

我試圖使用計時器逐漸旋轉UIImageView，這段代碼旋轉它，但它似乎不是圍繞圖像中心旋轉，以及將CGAffineTransformMakeRotation添加到我的代碼似乎停止了所有其他代碼主要的“方法

#define radians(degrees) (degrees * M_PI/180)

NSTimer *timer = [NSTimer scheduledTimerWithTimeInterval:0.016 target:self selector:@selector(main) userInfo:nil repeats:YES];
-(void)main{
rotate++;
uiImageView.transform = CGAffineTransformMakeRotation(radians(rotate));
uiImageView.center = CGPointMake(uiImageView.center.x+1, uiImageView.center.y);
}

Answer 1

嘗試這個 ：

開始動畫：

  CABasicAnimation *rotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation"];
  rotation.fromValue = [NSNumber numberWithFloat:0];
  rotation.toValue = [NSNumber numberWithFloat:(2*M_PI)];
  rotation.duration = 1.0;// Speed
  rotation.repeatCount = HUGE_VALF;// Repeat forever.
  [imgViewCube.layer addAnimation:rotation forKey:@"Spin"];

停止動畫：

  [imgViewCube.layer removeAnimationForKey:@"Spin"];

Answer 2

您可以慢慢旋轉指定動畫的持續時間

 NSTimeInterval duration = 1.5;
[UIView animateWithDuration:duration animations:^
{
    // set the final transform/freame/center here
    uiImageView.transform = CGAffineTransformMakeRotation(radians(rotate));
    uiImageView.center = CGPointMake(uiImageView.center.x+1, uiImageView.center.y);

} completion:^(BOOL finished)
 {
     NSLog(@"animation completed");
 }];

Answer 3

你可以做這樣的事情

// this spin completes 360 degrees every 2 seconds
    [UIView animateWithDuration:1.0f
                          delay:0.0f
                        options: UIViewAnimationOptionRepeat
                     animations: ^(void){
                         uiImageView.transform = CGAffineTransformRotate(uiImageView.transform, M_PI / 2);
                     }
                     completion:NULL];