使用Facebook弹出动画约束？

Question

我能够使用动画

[UIView animateWithDuration:0.5 
         delay:0.5 
    usingSpringWithDamping:0.7 
     initialSpringVelocity:0.7 
        options:0 
       animations:^{ 
        [self.closeButton layoutIfNeeded]; 
       } completion:NULL]; 

约束变化，但我的印象是，这可能也使用Facebook POP库来完成。任何人都可以指出我正确的方向来了解如何？

谢谢

Answer 1

在这种情况下要进行动画处理的NSLayoutConstraint你可以用POP以下，这将动画约束。

constraint // this is an NSLayoutConstraint that is applied to some view 

POPSpringAnimation *layoutAnimation = [POPSpringAnimation animationWithPropertyNamed:kPOPLayoutConstraintConstant]; 
layoutAnimation.springSpeed = 20.0f; 
layoutAnimation.springBounciness = 15.0f; 
layoutAnimation.toValue = @(value to go too); 
[constraint pop_addAnimation:layoutAnimation forKey:@"detailsContainerWidthAnimate"]; 

要使用的主要属性是上面显示的kPOPLayoutConstraintConstant。

Answer 2

这里使用的弹簧动画另一个例子......

-(void)shakeViewConstraint:(NSLayoutConstraint*)constraint{ 

     POPSpringAnimation *springStart = [POPSpringAnimation animationWithPropertyNamed:kPOPLayoutConstraintConstant]; 

     springStart.springSpeed = 0.5; 
     springStart.springBounciness = 0.3; 
     springStart.fromValue = @(50); 
     springStart.toValue = @(25); 
     springStart.velocity = @600; 
     springStart.delegate = self; //Using Delegates as handlers 

     [constraint pop_addAnimation:springStart forKey:@"animationUniquekey"]; 

     //Using Blocks as handlers 
     [springStart setCompletionBlock:^(POPAnimation* animation, BOOL finished) { 

      if (finished) 
       [constraint pop_removeAnimationForKey:@"animationUniquekey"]; 
     }]; 
    } 

    #pragma mark - POP Animation Delegates 

    -(void)pop_animationDidStart:(POPAnimation *)anim{ 

     //NSLog(@"POP ANIM STARTED!!"); 

    } 

    -(void)pop_animationDidStop:(POPAnimation *)anim finished:(BOOL)finished{ 

     //NSLog(@"POP ANIM STOPPED!!"); 

     if (finished) { 

      //NSLog(@"POP ANIM FINISHED!!"); 
     } 
    }