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可以保存一组动画对象，将CAAnimationGroup对象加入层后，组中所有动画对象可以同时并发运行
属性解析：
animations：用来保存一组动画对象的NSArray
默认情况下，一组动画对象是同时运行的，也可以通过设置动画对象的beginTime属性来更改动画的开始时间
#import "ViewController.h"
@interface ViewController ()
@property(nonatomic,strong)UIButton *btn;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
self.btn=[UIButton buttonWithType:UIButtonTypeCustom];
self.btn.frame=CGRectMake(50, 100, 80, 60);
[self.btn setTitle:@"按钮" forState:UIControlStateNormal];
[self.btn setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
[self.btn addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
[self.view addSubview:self.btn];
}
-(void)btnClick:(id)sender
{
CABasicAnimation *a1 = [CABasicAnimation animation];
a1.keyPath = @"transform.translation.y";
a1.toValue = @(100);
// 缩放动画
CABasicAnimation *a2 = [CABasicAnimation animation];
a2.keyPath = @"transform.scale";
a2.toValue = @(2.0);
// 旋转动画
CABasicAnimation *a3 = [CABasicAnimation animation];
a3.keyPath = @"transform.rotation";
a3.toValue = @(-3.1415926/4);
// 组动画
CAAnimationGroup *groupAnima = [CAAnimationGroup animation];
groupAnima.animations = @[a1, a2, a3];
//设置组动画的时间
groupAnima.duration = 2;
groupAnima.fillMode = kCAFillModeForwards;
groupAnima.removedOnCompletion = NO;
[self.btn.layer addAnimation:groupAnima forKey:nil];
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
}
@end
core Animation之CAAnimationGroup(动画群组)
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原文地址：http://www.cnblogs.com/cuiyw/p/4422645.html
