Core Animationなどをポリポリ研究

1. 

   CAGradientLayerのHello world!

   - (void)viewDidLoad

   {    

       CAGradientLayer* gradientLayer = [CAGradientLayer layer];

       gradientLayer.frame = self.view.bounds;

       gradientLayer.startPoint = CGPointZero;

       gradientLayer.endPoint = CGPointMake(1.0, 1.0);

       NSMutableArray* array = [NSMutableArray array];

       [array addObject:(id)[UIColor redColor].CGColor];

       [array addObject:(id)[UIColor blueColor].CGColor];

       gradientLayer.colors = array;

       [self.view.layer addSublayer:gradientLayer];

   }

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