自定义模态转场动画
1.自定义模态视图切换动画
新建一个类实现UIviewControllerAnimatedTransitioning协议 这个类就是我们要用到的自定义的动画切换类
#import "ModelTransitionAnimation.h"
//需要模态出来的控制器
#import "ModelViewController.h"
@implementation ModelTransitionAnimation
//动画持续时间，单位是秒
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
{
return 1;
}
//动画效果
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
//通过键值UITranstionContexToViewControllerKey 获取需要呈现的视图控制器VC
UIViewController *toVc = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
//得到toVc完全呈现后的frame
CGRect finalFrame = [transitionContext finalFrameForViewController:toVc];
if ([toVc isKindOfClass:[ModelViewController class]]) {
//需要呈现的视图是模态视图，此时将模态视图的frame放到屏幕下方，这样才能实现从下方弹出的效果
toVc.view.frame = CGRectOffset(finalFrame, 0, [UIScreen mainScreen].bounds.size.height);
}else
{
//需要呈现的视图是主视图，此时将主视图的frame 放到屏幕空间上方 这样才能实现从上方放下的效果
toVc.view.frame = CGRectOffset(finalFrame, 0, -[UIScreen mainScreen].bounds.size.height);
}
//切换在containerView中完成，需要将toVc.view加到containerView中
UIView *containerView = [transitionContext containerView];
[containerView addSubview:toVc.view];
//开始动画 这里使用UIKit提供的弹簧效果动画
//useingSpringWithDamping越接近1 弹性效果越不明显
[UIView animateWithDuration:[self transitionDuration:transitionContext] delay:0 usingSpringWithDamping:0.5 initialSpringVelocity:0 options:UIViewAnimationOptionCurveEaseIn animations:^{
toVc.view.frame = finalFrame;
} completion:^(BOOL finished) {
//通知系统动画切换完成
[transitionContext completeTransition:YES];
}];
}
控制器需要做的事情就是将系统的自带的动画替换掉
需遵守ModelViewControllerDelegate,UIViewControllerTransitioningDelegate 这两个协议
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
return _animation;
}
