CALayer常用属性，隐式动画

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////  CALayerController.m//  CALayer////  Created by xiaoyao on 15/3/5.//  Copyright (c) 2015年 lijien. All rights reserved.//#import "CALayerController.h"#define WIDTH 50@interface CALayerController ()@end@implementation CALayerController- (void)viewDidLoad {  [super viewDidLoad];    [self drawMyLayer];}- (void)drawMyLayer {  CGSize size = [UIScreen mainScreen].bounds.size;    CALayer *layer = [[CALayer alloc] init];  layer.position = CGPointMake(size.width / 2, size.height / 2);  layer.bounds = CGRectMake(0, 0, WIDTH, WIDTH);  layer.backgroundColor = [UIColor colorWithRed:0 green:146 / 255 blue:1 alpha:1].CGColor;    layer.cornerRadius = WIDTH / 2;    layer.shadowColor = [UIColor grayColor].CGColor;  layer.shadowOffset = CGSizeMake(2, 2);  layer.shadowOpacity = .9;    [self.view.layer addSublayer:layer];}- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {  CALayer *layer = self.view.layer.sublayers[0];  UITouch *touch = [touches anyObject];    CGFloat width = layer.bounds.size.width;  if (width == WIDTH) {    width = WIDTH * 4;  } else {    width = WIDTH;  }    layer.bounds = CGRectMake(0, 0, width, width);  layer.cornerRadius = width / 2;  layer.position = [touch locationInView:self.view];}@end

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