/*
CAAnimationGroup 动画组
1、animations 动画的数组
2、beginTime 启动的时间
3、动画组设置了“持续时间（duration）”，可能会导致动画组里面的“动画持续时间”失效
*/
#import "ViewController.h"
@interface ViewController ()
{
CALayer *petal;
}
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self addBgView];
[self addAnimationGroup];
// [self addPetalLayer];
}
#pragma mark - 添加背景图
- (void)addBgView {
UIImageView *bgView = [[UIImageView alloc] initWithFrame:self.view.frame];
bgView.image = [UIImage imageNamed:@"落叶.jpg"];
[self.view addSubview:bgView];
[self addPetalLayer];
}
#pragma mark - 添加需要动画的图片
- (void)addPetalLayer {
UIImage *image = [UIImage imageNamed:@"petal.jpg"];
petal = [[CALayer alloc] init];
petal.position = CGPointMake(100, 200);
petal.bounds = CGRectMake(0, 0, image.size.width, image.size.height);
petal.contents = (id)image.CGImage;
[self.view.layer addSublayer:petal];
}
#pragma mark - 旋转动画（属于“基础动画”）
- (CABasicAnimation *)rotationAnimation {
CABasicAnimation *rotation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.z"]; // 旋转z轴
rotation.toValue = @(M_PI_2*3); // 旋转角度
rotation.removedOnCompletion = NO;
return rotation;
}
#pragma mark - 往下落的动画
- (CAKeyframeAnimation *)dropAnimation {
CAKeyframeAnimation *drop = [CAKeyframeAnimation animationWithKeyPath:@"position"];
CGPathRef pathRef = CGPathCreateMutable();
CGPathMoveToPoint(pathRef, NULL, petal.position.x, petal.position.y);
// // CGPathAddCurveToPoint cp1x y cpx y 设置两个点 在这两个点之间画曲线
// x y 终止点
CGPoint endPoint = CGPointMake(40, 500);
CGPathAddCurveToPoint(pathRef, NULL, 160, 280, -30, 300, endPoint.x, endPoint.y);
drop.path = pathRef;
CGPathRelease(pathRef);
return drop;
}
#pragma mark - 添加动画组
- (void)addAnimationGroup {
CAAnimationGroup *animationGroup = [CAAnimationGroup animation];
animationGroup.animations = @[[self rotationAnimation], [self dropAnimation]];
animationGroup.duration = 10;
// beginTime 动画开始时间
// CACurrentMediaTime() 获得当前时间 从调用该方法开始后 10 秒开始执行
animationGroup.beginTime = CACurrentMediaTime() + 1;
animationGroup.removedOnCompletion = NO;
animationGroup.fillMode = kCAFillModeBoth;
animationGroup.repeatCount = 5;
[petal addAnimation:animationGroup forKey:@"group"];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
@end