ios - Why CAKeyframeAnimation didn't present after created? -

my code won't work.

- (cakeyframeanimation  *)createanimation {     cakeyframeanimation *animation = [cakeyframeanimation animationwithkeypath:@"path"];      //does @"path" mean path created below ? or path on layer?      animation.timingfunction = [camediatimingfunction functionwithname:kcamediatimingfunctioneaseineaseout];       cgmutablepathref path = cgpathcreatemutable();     cgpathmovetopoint(path, null, width-100, 0);      cgpathaddquadcurvetopoint(path, null, width+100, 300, width-100, height);     cgpathaddquadcurvetopoint(path, null, width+20, 220, width-100, height);     cgpathaddquadcurvetopoint(path, null, width+50, 230, width-100, height);     // …… more code      animation.path = path;     animation.repeatcount = 10;     animation.delegate = self;     animation.duration = 2;      cgpathrelease(path);     return animation; } 

this animation. have implement delegate animationdidstart , didstop. animation did executed.

then add animation custom calayer. intend animate 1 path on layer. code layer:

 draglayer = [[cashapelayer alloc] init];     draglayer.frame = cgrectmake(0, 0, width, height);     draglayer.path = [self pathtoanimatewithx:0 andy:0]; // custom method create cgpathref     draglayer.fillcolor = appcolor.cgcolor;     draglayer.strokecolor = [uicolor redcolor].cgcolor  ;     draglayer.linewidth = 5;     [self.layer addsublayer:draglayer];      [draglayer addanimation:[self createanimation] forkey:@"uposuuuition"]; 

i thought problem animated path has no color, , don't know how add after lot of searching (including apple's documentation).

the other problem how animate draglayer's own path instead of recreating it.

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update: have read documentation again , cakeyframeanimation seems wrong way it.i have find other way it.thanks

the problem you're animating path property of shape layer, want animate position property. try instead:

- (cakeyframeanimation  *)createanimation {     cakeyframeanimation *animation = [cakeyframeanimation animationwithkeypath:@"position"];     ...