九 iOS 之CAAnimationGroup（动画组）

CAAnimationGroup

动画组，是CAAnimation的子类，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

属性说明：

• 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

示例演示

点击屏幕同时平移、缩放、旋转

• 核心代码 ViewController.m

#import "ViewController.h"@interface ViewController ()@property (weak, nonatomic) IBOutlet UIView *redView;@end@implementation ViewController- (void)viewDidLoad {    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.}- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{    //同时缩放，平移，旋转    CAAnimationGroup * group = [CAAnimationGroup animation];    CABasicAnimation * rotation = [CABasicAnimation animation];    rotation.keyPath = @"transform.rotation";    rotation.toValue = @(arc4random_uniform(M_PI));    CABasicAnimation * scale = [CABasicAnimation animation];    scale.keyPath = @"transform.scale";    scale.toValue =@ 0.5;    CABasicAnimation * position = [CABasicAnimation animation];    position.keyPath =  @"position";    position.toValue = [NSValue valueWithCGPoint:CGPointMake(arc4random_uniform(200), arc4random_uniform(200))];    group.animations = @[rotation,scale,position];    //取消动画反弹    group.removedOnCompletion = NO;    //设置动画执行完成后保持最新的效果    group.fillMode = kCAFillModeForwards;    [_redView.layer addAnimation:group forKey:nil];}@end