ios菜鸟之路：控件的抖动特效，密码错误时的抖动提示

- (void)animateIncorrectPassword {

    // Clear the password field

    

    // Animate the alert to show that the entered string was wrong

    // "Shakes" similar to OS X login screen

    CGAffineTransform moveRight = CGAffineTransformTranslate(CGAffineTransformIdentity, 20, 0);

    CGAffineTransform moveLeft = CGAffineTransformTranslate(CGAffineTransformIdentity, -20, 0);

    CGAffineTransform resetTransform = CGAffineTransformTranslate(CGAffineTransformIdentity, 0, 0);

    

    CGAffineTransform transform = CGAffineTransformIdentity;   //申明旋转量

    //transform = CGAffineTransformMakeRotation(-M_PI/2);     //设置旋转量具体值

    

    [UIView animateWithDuration:0.1 animations:^{

        // Translate left

        button.transform = moveLeft;

        

        

    } completion:^(BOOL finished) {

        

        [UIView animateWithDuration:0.1 animations:^{

            

            // Translate right

            button.transform = moveRight;

            

        } completion:^(BOOL finished) {

            

            [UIView animateWithDuration:0.1 animations:^{

                

                

                // Translate left

                button.transform = moveLeft;

                

            } completion:^(BOOL finished) {

                

                [UIView animateWithDuration:0.1 animations:^{

                    

                    // Translate to origin

                    button.transform = resetTransform;

                }];

            }];

            

        }];

    }];

    

}