ios - CABasicAnimation - transform scale keep in center -

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trying animatie ellipse masked on uiview scale transformed remaining in center position.

i have found calayer - cabasicanimation not scaling around center/anchorpoint, , followed adding bounds property masklayer cashapelayer however, ends mask being positioned in left corner 1/4 of showing. mask remain within center of screen.

@synthesize maskedview; - (void)viewdidload {     [super viewdidload];     uiviewcontroller *vc = [self.storyboard instantiateviewcontrollerwithidentifier:@"next"];      vc.view.frame = cgrectmake(0,0, self.view.frame.size.width, self.view.frame.size.height); vc.view.layer.bounds = self.view.layer.bounds;      cashapelayer *masklayer = [[cashapelayer alloc] init];      cgrect maskrect = cgrectmake((self.view.frame.size.width/2)-50, (self.view.frame.size.height/2)-50, 100, 100);     cgmutablepathref path = cgpathcreatemutable();     cgpathaddellipseinrect(path, nil, maskrect);     [masklayer setpath:path];      cgpathrelease(path);      vc.view.layer.mask = masklayer;     [self.view addsubview:vc.view];      maskedview = vc.view;     [self startanimation]; }

animation...

-(void)startanimation {     maskedview.layer.mask.bounds = cgrectmake((self.view.frame.size.width/2)-50, (self.view.frame.size.height/2)-50, 100, 100);     maskedview.layer.mask.anchorpoint = cgpointmake(.5,.5);     maskedview.layer.mask.contentsgravity = @"center";      cabasicanimation *animation = [cabasicanimation animationwithkeypath:@"transform.scale"];      animation.duration = 1.0f;     animation.timingfunction = [camediatimingfunction functionwithname:kcamediatimingfunctioneaseineaseout];     animation.fromvalue = [nsnumber numberwithfloat:1.0f];     animation.tovalue = [nsnumber numberwithfloat:5.0f];      [maskedview.layer.mask addanimation:animation forkey:@"animatemask"]; }

update

i seem have fixed second animation on position key. correct or there better way of doing this?

cabasicanimation *animation2 = [cabasicanimation animationwithkeypath:@"position"];  animation2.duration = 1.0f;  animation2.timingfunction = [camediatimingfunction functionwithname:kcamediatimingfunctioneaseineaseout];  animation2.fromvalue = [nsvalue valuewithcgpoint:cgpointmake((self.view.frame.size.width/2), (self.view.frame.size.height/2))]; animation2.tovalue = [nsvalue valuewithcgpoint:cgpointmake((self.view.frame.size.width/2), (self.view.frame.size.height/2))];  [tobemask.layer.mask addanimation:animation2 forkey:@"animatemask2"];

you can create scale around center of object instead of (0, 0) this:

cabasicanimation *scale = [cabasicanimation animationwithkeypath:@"transform"]; catransform3d tr = catransform3didentity; tr = catransform3dtranslate(tr, self.bounds.size.width/2, self.bounds.size.height/2, 0); tr = catransform3dscale(tr, 3, 3, 1); tr = catransform3dtranslate(tr, -self.bounds.size.width/2, -self.bounds.size.height/2, 0); scale.tovalue = [nsvalue valuewithcatransform3d:tr];

so start out "identity" transform (which means 'no transform'). translate (move) center of object. scale. move origo we're started (we wanted affect scale operation).


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