使用自定义动画呈现ViewController

Question

我正在使用foll呈现视图控制器。代码：

VC_B * b = [[VC_B alloc] init...]; 
[self presentViewController:b animated:YES completion:nil]; 

我试图动画视图控制器的外观：输入VC应当从当前显示的顶部覆盖VC向下滑动。以下this解决方案使其有一个问题：在输入VC出现在屏幕上之前，当前VC消失。有没有办法解决这个问题？也许有另一种解决方案来实现这一效果。

Answer 1

请参阅下面的试试。只需要从下面的方法调用NewViewController.What你需要做的就是你只需要改变NewViewcOntroller的视图框的OriginY。

-(void)displayNewVC 
{ 

YourNewViewController *newVC = [[YourNewViewController alloc] init]; 

CGFloat originY = -450;//set originY as you want to display newViewController from the Top to bottom with animation 
//initially set originY out of the Frame of CurrentViewcontroller 
newVC.view.frame = CGRectMake(orginX, originY, newVC.view.frame.size.width, newVC.view.frame.size.height); 

/*Display View With Animation*/ 
originY = 300; 
[UIView animateWithDuration:.3 animations:^{ 
    //set new originY as you want. 
    newVC.view.frame = CGRectMake(orginX, originY, newVC.view.frame.size.width, newVC.view.frame.size.height); 

} completion:NULL]; 

[currentViewController.view addSubview:newVC.view]; 

} 

我希望它可以帮助你。

Answer 2

试试这个代码：

CreateNewViewController *newViewController = [[CreateNewViewController alloc]initWithNibName:@"CreateNewViewController" bundle:nil]; 

    CATransition *transition = [CATransition animation]; 
    transition.duration = 0.05; 
    transition.timingFunction = [CAMediaTimingFunction  
    functionWithName:kCAMediaTimingFunctionEaseInEaseOut]; 
    transition.type =kCATransitionMoveIn; 
    transition.subtype =kCATransitionFromTop; 

    transition.delegate = self; 

    [self presentModalViewController:newViewController animated:NO]; 
    [self.view insertSubview:newViewController.view atIndex:0]; 

    [self.view.layer addAnimation:transition forKey:nil]; 

希望这会帮助你。