#import "ViewController.h"
@interface ViewController ()
{
CALayer *petalLayer;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
UIImageView *imageView = [[UIImageView alloc]initWithFrame:[UIScreen mainScreen].bounds];
imageView.image = [UIImage imageNamed:@"落叶.jpg"];
[self.view addSubview:imageView];
[self addPetal];
}
- (void)addPetal
{
UIImage *petal = [UIImage imageNamed:@"petal.jpg"];
petalLayer = [[CALayer alloc]init];
petalLayer.bounds = CGRectMake(0, 0, petal.size.width, petal.size.height);
petalLayer.position = CGPointMake(100, 200);
petalLayer.contents = (id)petal.CGImage;
[self.view.layer addSublayer:petalLayer];
}
- (void)addAnimation {
CAKeyframeAnimation *keyAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
keyAnimation.duration = 5;
// 创建路径
CGMutablePathRef path = CGPathCreateMutable();
// 给路径添加一个 起始点
CGPathMoveToPoint(path, NULL, petalLayer.position.x, petalLayer.position.y);
// 有起始点 可以通过起始点 到 另一个点 画一条线
CGPathAddLineToPoint(path, NULL, petalLayer.position.x+100, petalLayer.position.y+100);
CGPathAddLineToPoint(path, NULL, petalLayer.position.x-100, petalLayer.position.y+300);
// 关闭路径
// CGPathCloseSubpath(path);
// 将路径添加到 keyAnimation（动画上）
keyAnimation.path = path;
// 释放路径
// 但凡通过quarzt2d中带有creat/copy/retain方法创建出来的值都必须手动的释放
// 有两种方法可以释放前面创建的路径：
// （1）CGPathRelease(path);
// （2）CFRelease(path);
// 说明：CFRelease属于更底层的cocafoundation框架
CGPathRelease(path);
path = nil;
keyAnimation.removedOnCompletion = NO;
keyAnimation.fillMode = kCAFillModeBoth;
keyAnimation.repeatCount = 10;
[petalLayer addAnimation:keyAnimation forKey:@"show"];
}
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
[self addAnimation];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end