Question

when we enter wrong password in a program that need password in OSX the window shakes how can i implement it in my program?

Answer 1

use below code when user enter wrong password

static int numberOfShakes = 8;
    static float durationOfShake = 0.5f;
    static float vigourOfShake = 0.05f;

    CGRect frame=[self.view.window frame];
    CAKeyframeAnimation *shakeAnimation = [CAKeyframeAnimation animation];

    CGMutablePathRef shakePath = CGPathCreateMutable();
    CGPathMoveToPoint(shakePath, NULL, NSMinX(frame), NSMinY(frame));
    int index;
    for (index = 0; index < numberOfShakes; ++index)
    {
        CGPathAddLineToPoint(shakePath, NULL, NSMinX(frame) - frame.size.width * vigourOfShake, NSMinY(frame));
        CGPathAddLineToPoint(shakePath, NULL, NSMinX(frame) + frame.size.width * vigourOfShake, NSMinY(frame));
    }
    CGPathCloseSubpath(shakePath);
    shakeAnimation.path = shakePath;
    shakeAnimation.duration = durationOfShake;

    [self.view.window setAnimations:[NSDictionary dictionaryWithObject: shakeAnimation forKey:@"frameOrigin"]];
    [[self.view.window animator] setFrameOrigin:[self.view.window frame].origin];