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"];}