iOS控件抖动效果

方案一：

CABasicAnimation *shake = [CABasicAnimation animationWithKeyPath:@"transform.translation.x"];
    shake.fromValue = [NSNumber numberWithFloat:-5];
    shake.toValue = [NSNumber numberWithFloat:5];
    shake.duration = 0.1;//执行时间
    shake.autoreverses = YES;//是否重复
    shake.repeatCount = 2;//次数
    [self.schemeOneLable.layer addAnimation:shake forKey:@"shakeAnimation"];

方案二

    CAKeyframeAnimation *shakeAnim = [CAKeyframeAnimation animation];
    shakeAnim.keyPath = @"transform.translation.x";
    shakeAnim.duration = 0.1;
    CGFloat delta = 5;
    shakeAnim.values = @[@0,@(-delta),@(delta),@0];
    shakeAnim.repeatCount = 2;
    [self.schemeTwoLable.layer addAnimation:shakeAnim forKey:nil];

两个方案设置了同样的数据最后的显示结果也不太一样，目前还不清楚原因。

对应.m文件

#import "ViewController.h"

@interface ViewController ()

@property (nonatomic,strong) UILabel *schemeOneLable;
@property (nonatomic,strong) UILabel *schemeTwoLable;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    
    self.schemeOneLable = [[UILabel alloc]init];
    self.schemeOneLable.frame = CGRectMake(50, 50, 200, 20);
    self.schemeOneLable.text = @"我想抖~方案一";
    [self.view addSubview:self.schemeOneLable];
    
    self.schemeTwoLable = [[UILabel alloc]init];
    self.schemeTwoLable.frame = CGRectMake(50, 100, 200, 20);
    self.schemeTwoLable.text = @"我想抖~方案二";
    [self.view addSubview:self.schemeTwoLable];
    // Do any additional setup after loading the view, typically from a nib.
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event{
    CABasicAnimation *shake = [CABasicAnimation animationWithKeyPath:@"transform.translation.x"];
    shake.fromValue = [NSNumber numberWithFloat:-5];
    shake.toValue = [NSNumber numberWithFloat:5];
    shake.duration = 0.1;//执行时间
    shake.autoreverses = YES;//是否重复
    shake.repeatCount = 2;//次数
    [self.schemeOneLable.layer addAnimation:shake forKey:@"shakeAnimation"];
    
    CAKeyframeAnimation *shakeAnim = [CAKeyframeAnimation animation];
    shakeAnim.keyPath = @"transform.translation.x";
    shakeAnim.duration = 0.1;
    CGFloat delta = 5;
    shakeAnim.values = @[@0,@(-delta),@(delta),@0];
    shakeAnim.repeatCount = 2;
    [self.schemeTwoLable.layer addAnimation:shakeAnim forKey:nil];
}

@end