iOS控件抖動

本Demo比較簡單，以用戶登錄爲例，當用戶名不爲“張三”則抖動用戶名輸入框，當密碼不爲“123456”則抖動密碼輸入框，直接上代碼:

#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:@"張三"]) {
        [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];
}