Rotating and Moving a UIImageView (CocoaTouch)

Question

This code works to rotate:

  CGAffineTransform transform = CGAffineTransformMakeRotation(radians(lastAngle++)); 
  anImage.transform = transform;  

and this code works to move my UIImageView

  CGRect frame = [anImage frame];
  frame.origin.x+=1;
  frame.origin.y+=1;
  [anImage setFrame:frame];

but when I combine them, the image stretches out increasingly on each run through. Perhaps the frame should not be modified like this?

Answer 1

From the doc of .frame :

http://developer.apple.com/iphone/library/Resources/439/Images/icon_warning.gif Warning: If the transform property is not the identity transform, the value of this property is undefined and therefore should be ignored.

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The .transform property can be used for translation too, see CGAffineTransformMakeTranslation or CGAffineTransformTranslate.

Answer 2

改为更改“中心”属性。