ios - 如何实现图片的3D旋转，而且是不停旋转？

Question

我的代码是这样的：

//  ViewController.m
//  核心动画
#import "ViewController.h"
@interface ViewController ()
@property (weak, nonatomic) IBOutlet UIImageView *imageView;

@end
@implementation ViewController
- (void)viewDidLoad {
    [super viewDidLoad];
}
-(void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    [UIView  animateWithDuration:3 animations:^{
self.imageView.layer.transform=CATransform3DMakeRotation(M_PI, 0, 1,1);
    }]; 
}
- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
}
@end

但是这样做旋转了一次就不在旋转了。请问如何实现不停的旋转呢？（按照Y轴）

Answer 1

[UIView animateWithDuration:3
                      delay:0
                    options:UIViewAnimationOptionRepeat
                 animations:^{

                 }
                 completion:^(BOOL finished) {

                 }];

Answer 2

LZ的代码,并不是按照Y找转,Y,Z同时都会动,按Y轴循环转动,有以下两种方法可供参考,推荐第一种方法,过渡更平滑,自然.
方法一:

    CABasicAnimation* rotationAnimation;
    rotationAnimation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.y"];
    rotationAnimation.toValue = [NSNumber numberWithFloat: M_PI * 2.0 ];
    rotationAnimation.duration = 3;
    rotationAnimation.cumulative = YES;
    rotationAnimation.repeatCount = MAXFLOAT;
    
    [self.imageView.layer addAnimation:rotationAnimation forKey:@"rotationAnimation"];

方法二:

[UIView animateWithDuration:3
                      delay:0
                    options:UIViewAnimationOptionRepeat
                 animations:^{
                     self.imageView.layer.transform=CATransform3DMakeRotation(M_PI, 0, 1, 0);
                 }
                 completion:^(BOOL finished) {
                     self.imageView.layer.transform=CATransform3DMakeRotation(M_PI, 0, 1, 0);
                 }];