趁周末闲暇之余，重新写一下present和push的自定义动画。
本来之前有写过一个，因为没有及时整理，到导致一时凌乱，找不到具体在哪了，提醒各位，平时要注意代码的整理和归档，不然到时候重复的代码写了又写，那就得不偿失了。废话不过说，先看下下面的效果：
效果图展示
原生的present是从底部向上弹出相应的视图控制器，而push动画，则是将视图从右边推出来进行展示，为了视图展示的统一性，需要自定义转场动画，将present改成从右往左推出来展示，在dismiss的VC中需要增加一个左边的手势，以满足侧滑返回的效果。
首先需要主页VC实现UIViewControllerTransitioningDelegate这个代理中的2个方法
#pragma mark - UIViewControllerTransitioningDelegate
- (id<UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source{
return [[YQPresentTransitionAnimated alloc] init];
}
- (id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed {
return [[YQDismissTransitionAnimated alloc] init];
}
将它的present动画和dismiss动画交给我们自定义的动画来管理。
present动画的自定义####
1.创建一个类，继承至NSObject,并实现UIViewControllerAnimatedTransitioning的代理;
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>
@interface YQPresentTransitionAnimated : NSObject<UIViewControllerAnimatedTransitioning>
@end
2.实现代理的2个方法
//1.定义转场动画的时间
- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
return 0.4;
}
//2.实现转场动画的动画效果
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
UIViewController *fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey]; //主页VC
UIViewController *toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey]; //present的VC
UIView *containerView = transitionContext.containerView; //转场的容器视图，动画完成后，会消失
UIView *fromView;
UIView *toView;
if ([transitionContext respondsToSelector:@selector(viewForKey:)]) {
fromView = [transitionContext viewForKey:UITransitionContextFromViewKey];
toView = [transitionContext viewForKey:UITransitionContextToViewKey];
} else {
fromView = fromViewController.view;
toView = toViewController.view;
}
//注意这个对应关系
BOOL isPresenting = (toViewController.presentingViewController == fromViewController);
CGRect fromFrame = [transitionContext initialFrameForViewController:fromViewController];
CGRect toFrame = [transitionContext finalFrameForViewController:toViewController];
if (isPresenting) {
fromView.frame = fromFrame;
toView.frame = CGRectOffset(toFrame, toFrame.size.width, 0);
}
if (isPresenting)
[containerView addSubview:toView];
NSTimeInterval transitionDuration = [self transitionDuration:transitionContext];
[UIView animateWithDuration:transitionDuration animations:^{
if (isPresenting) {
toView.frame = toFrame;
fromView.frame = CGRectOffset(fromFrame, fromFrame.size.width * 0.3 * -1, 0);
}
} completion:^(BOOL finished) {
//固定写法
BOOL wasCancelled = [transitionContext transitionWasCancelled];
if (wasCancelled)
[toView removeFromSuperview];
[transitionContext completeTransition:!wasCancelled];
}];
}
3.将主页VC的transitioningDelegate设为自己，【千万注意】：还需要将present的页面的transitioningDelegate设为自己（主页VC）
dismiss动画的自定义####
跟上面的present步骤一样，只需将动画效果换成相反的即可。
