如何从固定的中心点旋转图像和箭头线

Question

在我的应用程序中，我有一个修复大小的按钮/中心点，我想旋转箭头线和此附加图像也旋转时，我触摸/向上/向下滚动。 而我在这个作了一个演示，我只使用icarousel类来滚动图像。 但我无法同时滚动两个箭头和图像滚动。 请帮助我如何实现这一点。

，并使用icarousel在这里我只图像滚动代码..

- (UIView *)carousel:(__unused iCarousel *)carousel viewForItemAtIndex: (NSInteger)index reusingView:(UIView *)view 
{ 
UIView *viewFor; 
UIImageView *itemView; 
if (view==nil) { 

    viewFor=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)]; 
    itemView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 45, 120, 120)]; 
    [itemView.layer setCornerRadius:itemView.frame.size.width/2]; 
    [itemView setClipsToBounds:YES]; 
    [viewFor addSubview:itemView]; 

     StikImage=[[UIImageView alloc]initWithFrame:CGRectMake(-140, 95, 140, 20)]; 
    StikImage.backgroundColor=[UIColor whiteColor]; 
    [viewFor addSubview:StikImage]; 

    } 
    else 
    { 
    viewFor=[[UIView alloc]initWithFrame:CGRectMake(0, 0, 200, 200)]; 
    itemView=[[UIImageView alloc]initWithFrame:CGRectMake(0, 45, 120, 120)]; 
    [itemView.layer setCornerRadius:itemView.frame.size.width/2]; 
    [itemView setClipsToBounds:YES]; 
    [viewFor addSubview:itemView]; 

     StikImage=[[UIImageView alloc]initWithFrame:CGRectMake(-140, 95, 140, 20)]; 
     StikImage.backgroundColor=[UIColor whiteColor]; 
     [viewFor addSubview:StikImage]; 

    } 
    itemView.image=[images objectAtIndex:index]; 
return viewFor; 
} 

这里是我的自定义类型icrousel方法变换图像

- (CATransform3D)carousel:(iCarousel *)carousel itemTransformForOffset:(CGFloat)offset baseTransform:(CATransform3D)transform { 

const CGFloat centerItemZoom = 1.6; 
const CGFloat centerItemSpacing = 1.2; 
const CGFloat centerItemYOffset = 100; 
CGFloat spacing = [self carousel:carousel valueForOption:iCarouselOptionSpacing withDefault:1.3f]; 
CGFloat absClampedOffset = MIN(2.5, fabs(offset)); 
CGFloat clampedOffset = MIN(1.0, MAX(-1.0, offset)); 
CGFloat scaleFactor = 1.0 + absClampedOffset * (1.2/centerItemZoom - 1.0); 
CGFloat yoffset = (1.0f - absClampedOffset) * centerItemYOffset; 
offset = (scaleFactor * offset + scaleFactor * (centerItemSpacing - 1.0) * clampedOffset) * carousel.itemWidth * spacing; 



if (carousel.vertical) 
{ 
    transform = CATransform3DTranslate(transform, yoffset, offset, -absClampedOffset); 

} 
else 
{ 
    transform = CATransform3DTranslate(transform, offset, yoffset, -absClampedOffset); 
} 

transform = CATransform3DScale(transform, scaleFactor, scaleFactor, 5.0f); 
    return transform; 
} 

Answer 1

使用下面的代码为旋转图像视图

imageview.transform = CGAffineTransformMakeRotation(degrees * M_PI/180); 

你可以使用你想要的度数大小像180,90,240,270 ...，取决于你的要求“触摸/向上/向下滚动”