iOS之UITextField输入错误的震动动画

 1 //左右震动效果
 2 - (void)shake:(UIView *)view {
 3 CGRect frame = view.frame;
 4 CAKeyframeAnimation *shakeAnimation = [CAKeyframeAnimation animationWithKeyPath:@"position"];
 5 
 6 CGMutablePathRef shakePath = CGPathCreateMutable();
 7 CGPathMoveToPoint(shakePath, NULL, frame.origin.x+frame.size.width/2, frame.origin.y+frame.size.height/2);
 8 int index;
 9 for (index = 3; index >=0; --index) {
10 CGPathAddLineToPoint(shakePath, NULL, frame.origin.x+frame.size.width/2 - frame.size.width * 0.02f * index, frame.origin.y+frame.size.height/2);
11 CGPathAddLineToPoint(shakePath, NULL, frame.origin.x+frame.size.width/2 + frame.size.width * 0.02f * index, frame.origin.y+frame.size.height/2);
12 }
13 CGPathCloseSubpath(shakePath);
14 
15 shakeAnimation.path = shakePath;
16 shakeAnimation.duration = 0.5f;
17 shakeAnimation.removedOnCompletion = YES;
18 
19 [view.layer addAnimation:shakeAnimation forKey:nil];
20 CFRelease(shakePath);
21 }
22 
23