CALayer、layer隐式动画

```

#import "ViewController.h"

#define originalWidth 100

@interface ViewController ()

@property (weak, nonatomic) IBOutlet UIView *redView;

@property(strong,nonatomic) CALayer* layer;

@end

@implementation ViewController

- (void)viewDidLoad {   

 [super viewDidLoad];      

  /*self.redView.layer.borderWidth = 10; 

   self.redView.layer.borderColor = [UIColor greenColor].CGColor;           

 //阴影    

self.redView.layer.shadowOffset = CGSizeMake(10, -10);    self.redView.layer.shadowColor = [UIColor grayColor].CGColor;    self.redView.layer.shadowOpacity = 0.7;       

 //圆角半径    

self.redView.layer.cornerRadius = 15;       

 self.redView.layer.contents = (id)[UIImage imageNamed:@"0.jpg"].CGImage;//.CGImage很重要        

//裁剪边角    

//self.redView.clipsToBounds = YES;    

//self.redView.layer.masksToBounds = YES;    //会把阴影也裁剪掉       

 //self.redView.layer.position = CGPointMake(0, 0);//position默认是中间那个点（默认锚点）所在的坐标，如果要把锚点改成左上角点：    

self.redView.layer.anchorPoint = CGPointMake(0, 0);//最大是（1，1）    self.redView.layer.position = CGPointMake(0, 0);*/      

---

CALayer* layer1 = [CALayer layer];  

 layer1.backgroundColor = [UIColor orangeColor].CGColor;  

  layer1.anchorPoint = CGPointMake(0, 0);   

layer1.position = CGPointMake(0, 0);   

 layer1.bounds = CGRectMake(0, 0, originalWidth, originalWidth);   

layer1.cornerRadius = originalWidth/2;       

[self.view.layer addSublayer:layer1];   

 self.layer = layer1;    }

-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent *)event{

//self.redView.layer.position  = CGPointMake(10, 20);

//self.redView.layer.bounds = CGRectMake(0, 0, 100, 100);

//self.redView.layer.transform = CATransform3DTranslate(self.redView.layer.transform, 20, 20, 20);

//kvc设置属性：

//static int value = 20;

//value+= 20;

//[self.redView.layer setValue:[NSNumber numberWithInt:value] forKeyPath:@"transform.translation.x"];//平移

//[self.redView.layer setValue:[NSNumber numberWithDouble:1.2] forKeyPath:@"transform.scale.x"];

---

//放大self.layer

if (self.layer.bounds.size.width == originalWidth) {

static int newWidth = originalWidth*2;

self.layer.bounds = CGRectMake(0, 0, newWidth, newWidth);

self.layer.cornerRadius = newWidth/2;

}else{

//缩小layer

self.layer.bounds = CGRectMake(0, 0, originalWidth, originalWidth);

self.layer.cornerRadius = originalWidth/2;

}

}

@end

```