Antialiasing edges of UIView after transformation using CALayer's transform

Question

I have a UIView object that rotates using CALayer\'s transform:

// Create uiview object.
UIImageView *block = [[UIImageView alloc]          


        

Answer 1

One way to do this is by placing the image inside another view that's 5 pixels bigger. The bigger view should have a transparent rasterized border that will smooth the edges of the UIImageView:

view.layer.borderWidth = 3; 
view.layer.borderColor = [UIColor clearColor].CGColor; 
view.layer.shouldRasterize = YES; 
view.layer.rasterizationScale = [[UIScreen mainScreen] scale];

Then, place your UIImageView inside this parent view and center it (With 2.5 pixels around each edge).

Finally, rotate the parent view instead of the image view.

It works very well - you can also encapsulate the whole thing in class that creates the hierarchy.