[英]How to make an animated gradient border around the vectorized image (Objective-C for iPad)?
檢查這一個是以前幫我,我覺得你可以用同樣的邏輯,使你的動畫。
通過使用shape-Layer:
[shapeLayer setBounds:shapeRect];
[shapeLayer setPosition:CGPointMake(160.0f, 140.0f)];
[shapeLayer setFillColor:[[UIColor clearColor] CGColor]];
[shapeLayer setStrokeColor:[[UIColor blackColor] CGColor]];
[shapeLayer setLineWidth:1.0f];
[shapeLayer setLineJoin:kCALineJoinRound];
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