从上面present动画

@interface TKTopPresentAnimation : NSObject <UIViewControllerAnimatedTransitioning>

@property (nonatomic, assign) BOOL isPresent;

@end

#import "TKTopPresentAnimation.h"


@implementation TKTopPresentAnimation

- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{
    return 0.375f;
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext{
    
    UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    
    UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    
    UIView* toView = nil;
    UIView* fromView = nil;
    UIView* transView = nil;
    
    if ([transitionContext respondsToSelector:@selector(viewForKey:)]) {
        fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];
        toView = [transitionContext viewForKey:UITransitionContextToViewKey];
    } else {
        fromView = fromViewController.view;
        toView = toViewController.view;
    }
    
    if (_isPresent) {
        transView = toView;
        [[transitionContext containerView] addSubview:toView];
        
    }else {
        transView = fromView;
        [[transitionContext containerView] insertSubview:toView belowSubview:fromView];
    }
    
    CGFloat width = [UIScreen mainScreen].bounds.size.width;
    CGFloat height = [UIScreen mainScreen].bounds.size.height;
    
    transView.frame = CGRectMake(0, _isPresent ? -height : 0, width, height);
    
    WEAKSELF
    [UIView animateWithDuration:[self transitionDuration:transitionContext] animations:^{
        transView.frame = CGRectMake(0, weakSelf.isPresent ? 0 : -height, width, height);
    } completion:^(BOOL finished) {
         [transitionContext completeTransition:!transitionContext.transitionWasCancelled];
    }];
    
}
@end

执行动画时，指定代理
在代理页面<UIViewControllerTransitioningDelegate>

#pragma  mark -- UIViewControllerTransitioningDelegate
//指定present动画
- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source {
    
    if ([presented isKindOfClass:NSClassFromString(@"TKVideoCallController")]) {
        TKTopPresentAnimation *animation = [[TKTopPresentAnimation alloc] init];
        animation.isPresent = YES;
        return animation;
    }
    return nil;
    
}
//指定dismiss动画
- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
    
    if ([dismissed isKindOfClass:NSClassFromString(@"TKVideoCallController")]) {
        TKTopPresentAnimation *animation = [[TKTopPresentAnimation alloc] init];
        animation.isPresent = NO;
        return animation;
    }
    return nil;
}

或者可以了解一下UIPresentationController，更为强大