iOS控件抖动

本Demo比较简单，以用户登录为例，当用户名不为“张三”则抖动用户名输入框，当密码不为“123456”则抖动密码输入框，直接上代码:

#import "ViewController.h"
#import <QuartzCore/QuartzCore.h>

@interface ViewController ()
@property (weak, nonatomic) IBOutlet UITextField *userNameTF;

@property (weak, nonatomic) IBOutlet UITextField *sercityTF;

@end

@implementation ViewController
- (IBAction)loginAction:(id)sender {
    
    if (![self.userNameTF.text isEqualToString:@"张三"]) {
        [self loadShakeAnimationForView:self.userNameTF];
    }
    if (![self.sercityTF.text isEqualToString:@"123456"]) {
        [self loadShakeAnimationForView:self.sercityTF];
    }
}

- (void)viewDidLoad
{
    [super viewDidLoad];
	// Do any additional setup after loading the view, typically from a nib.
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}


-(void)loadShakeAnimationForView:(UIView*)view
{
    CALayer *lbl = [view layer];
    CGPoint posLbl = [lbl position];
    CGPoint y = CGPointMake(posLbl.x-10, posLbl.y);
    CGPoint x = CGPointMake(posLbl.x+10, posLbl.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];
    [lbl addAnimation:animation forKey:nil];
}