textField输入内容有误时颤抖一下警示作用

做项目遇到一个需求，就是再输入手机号时如果手机号输入错误，textField要颤抖一下用来警示用户输入错误；网上也找过一些，那些都是封装好的，今天自己找到苹果自带的CAlayer动画可以实现，自己了一个方法；用苹果自带的API实现;

首先导入QuartzCore.framework这个框架，然后在控制器页面导入#import <QuartzCore/QuartzCore.h>

#点击来确定输入内容是否正确

- (void)isValidate

{

    if (![textField.text isEqualToString:@"code4app"]) {

        [self shakeAnimationForView:textField];

    }

}

-(void)shakeAnimationForView:(UIView*)view

{

    CALayer *lay_lb = [view layer];

    CGPoint pos_lb = [lay_lb position];

    CGPoint y = CGPointMake(pos_lb.x-10, pos_lb.y);

    CGPoint x = CGPointMake(pos_lb.x+10, pos_lb.y);

    CABasicAnimation * animation = [CABasicAnimation animationWithKeyPath:@"position"];

    [animation setTimingFunction:[CAMediaTimingFunction

                                  functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

    [animation setFromValue:[NSValue valueWithCGPoint:x]];

    [animation setToValue:[NSValue valueWithCGPoint:y]];

    [animation setAutoreverses:YES];

    [animation setDuration:0.08];

    [animation setRepeatCount:3];

    [lay_lb addAnimation:animation forKey:nil];

}