iOS字体抖动动画的实现代码

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
  [super viewDidLoad];
  // Do any additional setup after loading the view, typically from a nib.
  
  UIButton *button=[UIButton buttonWithType:UIButtonTypeRoundedRect];
  button.frame=CGRectMake(10, 100, 100, 200);
  button.backgroundColor=[UIColor redColor];
  [button setTitle:@"按钮" forState:UIControlStateNormal];
  [self.view addSubview:button];
  
  //按钮的动画效果
  [self buttonAnimation:button];
  
  
}

//按钮出现的时候有一个动画效果
- (void)buttonAnimation:(UIButton *)sender
{
  CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];
  
  CATransform3D scale1 = CATransform3DMakeScale(0.5, 0.5, 1);
  CATransform3D scale2 = CATransform3DMakeScale(1.2, 1.2, 1);
  CATransform3D scale3 = CATransform3DMakeScale(0.9, 0.9, 1);
  CATransform3D scale4 = CATransform3DMakeScale(1.0, 1.0, 1);
  
  NSArray *frameValues = [NSArray arrayWithObjects:
              [NSValue valueWithCATransform3D:scale1],
              [NSValue valueWithCATransform3D:scale2],
              [NSValue valueWithCATransform3D:scale3],
              [NSValue valueWithCATransform3D:scale4],
              nil];
  
  [animation setValues:frameValues];
  
  NSArray *frameTimes = [NSArray arrayWithObjects:
              [NSNumber numberWithFloat:0.0],
              [NSNumber numberWithFloat:0.5],
              [NSNumber numberWithFloat:0.9],
              [NSNumber numberWithFloat:1.0],
              nil];
  [animation setKeyTimes:frameTimes];
  
  animation.fillMode = kCAFillModeForwards;
  animation.duration = 0.3f;
  
  [sender.layer addAnimation:animation forKey:@"DSPopUpAnimation"];
}