//
// ViewController.m
// UI-NO-36-1 核心动画-2
//
// Created by 容伟 on 15/9/15.
// Copyright (c) 2015年 容伟. All rights reserved.
//
#import "ViewController.h"
@interface ViewController (){
CALayer *myLayer;
CGFloat width;
CALayer *imageLayer;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.view.backgroundColor = [UIColor whiteColor];
[self addLayer];
[self addImageLayer];
}
- (void)addLayer {
width = 100;
myLayer = [[CALayer alloc] init];
myLayer.backgroundColor = [UIColor whiteColor].CGColor;
myLayer.shadowOpacity = 1.0; // 阴影 默认的透明度是 0
myLayer.shadowColor = [UIColor yellowColor].CGColor;
myLayer.bounds = CGRectMake(0, 0, width, width);
myLayer.position = self.view.center;
myLayer.borderWidth = 2;
myLayer.borderColor = [UIColor blackColor].CGColor;
myLayer.cornerRadius = width/2;
myLayer.shadowOffset = CGSizeMake(-1, -1);
// myLayer.contents = (__bridge id)([UIImage imageNamed:@"12.jpg"].CGImage);
// myLayer.masksToBounds = YES;
[self.view.layer addSublayer:myLayer];
}
- (void)addImageLayer {
imageLayer = [[CALayer alloc] init];
imageLayer.bounds = CGRectMake(0, 0, width, width);
imageLayer.position = self.view.center;
imageLayer.cornerRadius = myLayer.cornerRadius;
imageLayer.contents = (__bridge id)([UIImage imageNamed:@"12.jpg"].CGImage);
imageLayer.masksToBounds = YES;
imageLayer.borderWidth = 2;
imageLayer.borderColor = [UIColor whiteColor].CGColor;
[self.view.layer addSublayer:imageLayer];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
[self changeStateWith:[touch locationInView:self.view]];
}
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event {
UITouch *touch = [touches anyObject];
[self changeStateWith:[touch locationInView:self.view]];
}
- (void)changeStateWith:(CGPoint)position {
myLayer.position = position;
width = width == 100 ? 300:100;
myLayer.bounds = CGRectMake(0, 0, width, width);
myLayer.cornerRadius = width/2;
imageLayer.position = position;
imageLayer.bounds = CGRectMake(0, 0, width, width);
imageLayer.cornerRadius = myLayer.cornerRadius;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end
原文：http://www.cnblogs.com/wukun16/p/4884163.html