封装了一个优雅的iOS转场动画

效果图

代码

//
//  LBTransition.m
//  LBWaterFallLayout_Example
//
//  Created by mac on 2024/6/16.
//  Copyright © 2024 liuboliu. All rights reserved.
//#import "LBTransition.h"@interface LBPushAnimation:NSObject<UIViewControllerAnimatedTransitioning>@property (nonatomic, weak) id <LBTransitionDelegate> delegate;@end@implementation LBPushAnimation- (instancetype)initWithDelegate:(id <LBTransitionDelegate>) delegate
{if (self = [super init]) {self.delegate = delegate;}return self;
}#pragma mark - UIViewControllerCanimatedtransitioning- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext{return 0.25;
}- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{UIView *containerView = [transitionContext containerView];UIViewController *toVC = (UIViewController *)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];[containerView addSubview:toView];UIViewController <LBTransitionDelegate> *transToVc;if ([toVC conformsToProtocol:@protocol(LBTransitionDelegate)]) {transToVc = (UIViewController <LBTransitionDelegate> *)toVC;}id transmitData = [self.delegate transmitViewData];CGRect finalFrame = [transToVc transmitViewfinalFrameWithData:transmitData containerView:containerView];UIView *transView = [self.delegate prepareTransimitView:containerView finalFrame:finalFrame];toView.alpha = 0;CGFloat scaleWidth = transView.frame.size.width / toView.frame.size.width;CGFloat scaleHeight = transView.frame.size.height / toView.frame.size.height;toView.transform = CGAffineTransformMakeScale(scaleWidth, scaleHeight);toView.center = transView.center;CGRect toViewFinalFrame = [transitionContext finalFrameForViewController:toVC];CGPoint finalCenter = CGPointMake(toViewFinalFrame.origin.x + toViewFinalFrame.size.width * 0.5,toViewFinalFrame.origin.y + toViewFinalFrame.size.height * 0.5);NSTimeInterval duration = [self transitionDuration:transitionContext];[UIView animateWithDuration:durationdelay:0options:UIViewAnimationOptionCurveEaseInOutanimations:^{[transToVc makeupAnimationStateTransmitView:transViewdata:transmitDatacontainerView:containerView];toView.alpha = 1;toView.center = finalCenter;toView.transform = CGAffineTransformIdentity;} completion:^(BOOL finished) {[self.delegate completeTransition];[transToVc completeTransitionWithView:transView data:transmitData];[transitionContext completeTransition:!transitionContext.transitionWasCancelled];}];}@end@interface LBPopAnimatin : NSObject <UIViewControllerAnimatedTransitioning>@property (nonatomic, weak) id <LBTransitionDelegate> delegate;@end@implementation LBPopAnimatin- (instancetype)initWithDelegate:(id <LBTransitionDelegate>)delegate {if (self = [super init]) {self.delegate = delegate;}return self;
}#pragma mark - UIViewControllerAnimatedTransitioning- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext
{return 0.25;
}- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{UIView *containerView = [transitionContext containerView];UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];UIView *fromView = fromVC.view;[containerView insertSubview:toView aboveSubview:fromView];UIViewController <LBTransitionDelegate> *transToVc;if ([fromVC conformsToProtocol:@protocol(LBTransitionDelegate)]) {transToVc = (UIViewController <LBTransitionDelegate> *)fromVC;}id transmitData = [transToVc transmitViewData];CGRect finalFrame = [self.delegate transmitViewfinalFrameWithData:transmitData containerView:containerView];UIView *transView = [transToVc prepareTransimitView:containerView finalFrame:finalFrame];NSTimeInterval duration = [self transitionDuration:transitionContext];CGPoint finalCenter = CGPointMake(finalFrame.origin.x + finalFrame.size.width * 0.5, finalFrame.origin.y + finalFrame.size.height * 0.5);CGFloat scaleWidth = finalFrame.size.width / fromView.frame.size.width;CGFloat scaleHeight = finalFrame.size.height / fromView.frame.size.height;CGFloat scale = scaleWidth < scaleHeight ? scaleWidth : scaleHeight;CGAffineTransform transform = CGAffineTransformMakeScale(scale, scale);[UIView animateWithDuration:duration delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{[self.delegate makeupAnimationStateTransmitView:transView data:transmitDatacontainerView:containerView];fromView.alpha = 0;fromView.center = finalCenter;fromView.transform = transform;} completion:^(BOOL finished) {if (transitionContext.transitionWasCancelled) {[transToVc completeTransitionWithView:transView data:transmitData];} else {[self.delegate completeTransitionWithView:transView data:transmitData];}[transitionContext completeTransition:!transitionContext.transitionWasCancelled];}];
}@end@interface LBTransition () <UIGestureRecognizerDelegate, UIViewControllerTransitioningDelegate>@property (nonatomic, weak) UIViewController <LBTransitionDelegate> *presentVC;
@property (nonatomic, weak) id <UIViewControllerContextTransitioning> transitionContext;
@property (nonatomic, assign) CGPoint startLocation;
@property (nonatomic, assign) CGFloat animationDuration;
@property (nonatomic, strong) UIView *transView;
@property (nonatomic, assign) CGFloat transViewCornerRadius;
@property (nonatomic, strong) id transmidData;
@property (nonatomic, strong) UIView *snapshotView;
@property (nonatomic, assign) CGRect origionFrame;
@property (nonatomic, assign) CGRect transViewFrame;@end@implementation LBTransition- (instancetype)initWithDelegate:(id<LBTransitionDelegate>)delegate
{if (self = [super init]) {self.delegate = delegate;self.origionFrame = CGRectZero;self.transViewFrame = CGRectZero;self.animationDuration = 0.25;}return self;
}#pragma mark - UINaivgationControllerDelegate- (id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operationfromViewController:(UIViewController *)fromVCtoViewController:(UIViewController *)toVC
{if (operation == UINavigationControllerOperationPush) {return [[LBPushAnimation alloc] initWithDelegate:self.delegate];} else {return [[LBPopAnimatin alloc] initWithDelegate:self.delegate];}
}- (id<UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationControllerinteractionControllerForAnimationController:(id<UIViewControllerAnimatedTransitioning>)animationController
{if (!self.interacting) {return nil;}return self;
}- (void)wireToViewController:(UIViewController<LBTransitionDelegate> *)viewController
{self.presentVC = viewController;UIPanGestureRecognizer *gesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];gesture.delegate = self;[viewController.view addGestureRecognizer:gesture];self.gesture = gesture;}- (void)startInteractiveTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{if (self.gesture.state == UIGestureRecognizerStatePossible) {dispatch_async(dispatch_get_main_queue(), ^{[transitionContext completeTransition:NO];});return;}self.transitionContext = transitionContext;UIView *containerView = [transitionContext containerView];UIView *toView = [transitionContext viewForKey:UITransitionContextToViewKey];UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];UIView *fromView = fromVC.view;[containerView insertSubview:toView belowSubview:fromView];self.transmidData = [self.presentVC transmitViewData];CGRect finalFrame = [self.delegate transmitViewfinalFrameWithData:self.transmidData containerView:containerView];self.transView = [self.presentVC prepareTransimitView:containerView finalFrame:finalFrame];self.transViewCornerRadius = self.transView.layer.cornerRadius;self.snapshotView = [fromView snapshotViewAfterScreenUpdates:NO];[self.snapshotView addSubview:self.transView];self.origionFrame = self.snapshotView.frame;self.transViewFrame = self.transView.frame;[containerView addSubview:self.snapshotView];fromView.alpha = 0;
}- (BOOL)gestureRecognizerShouldBegin:(UIGestureRecognizer *)gestureRecognizer
{return YES;
}
#pragma mark - action- (void)handleGesture:(UIPanGestureRecognizer *)gestureRecognizer
{CGFloat width = gestureRecognizer.view.superview.frame.size.width;CGPoint location = [gestureRecognizer locationInView:gestureRecognizer.view.superview];switch (gestureRecognizer.state) {case UIGestureRecognizerStateBegan:{self.interacting = YES;id transmitData = [self.presentVC transmitViewData];[self.delegate prepareAnimationWithData:transmitData];self.startLocation = location;UINavigationController *navigationController = self.presentVC.navigationController;id <UINavigationControllerDelegate> navigationControllerDelegate = navigationController.delegate;navigationController.delegate = self;[self.presentVC.navigationController popViewControllerAnimated:YES];navigationController.delegate = navigationControllerDelegate;}break;case UIGestureRecognizerStateChanged: {CGPoint trans = CGPointMake(location.x - self.startLocation.x, location.y - self.startLocation.y);CGFloat minScale = 0.3;CGFloat scale = (width - fabs(trans.x))/ width * (1 - minScale) + minScale;CGPoint transViewCenter = CGPointMake(self.transViewFrame.origin.x + self.transViewFrame.size.width * 0.5, self.transViewFrame.origin.y + self.transViewFrame.origin.y + self.transViewFrame.size.height * 0.5);self.snapshotView.frame = CGRectMake(0, 0, self.origionFrame.size.width * scale, self.origionFrame.size.height * scale);self.snapshotView.center = CGPointMake(self.origionFrame.size.width * 0.5 + trans.x, self.origionFrame.size.height * 0.5 + trans.y);transViewCenter.x *= scale;transViewCenter.y *= scale;self.transView.frame = CGRectMake(0, 0, self.transViewFrame.size.width * scale, self.transViewFrame.size.height * scale);self.transView.layer.cornerRadius = self.transViewCornerRadius * scale;self.transView.center = transViewCenter;}break;case UIGestureRecognizerStateCancelled:case UIGestureRecognizerStateEnded:{UIView *containerView = [self.transitionContext containerView];UIView *toView = [self.transitionContext viewForKey:UITransitionContextToViewKey];CGPoint trans = CGPointMake(location.x - self.startLocation.x, location.y - self.startLocation.y);if (fabs(trans.x) < (width * 0.15)) {[UIView animateWithDuration:self.animationDuration delay:0 options:UIViewAnimationOptionCurveEaseInOut animations:^{self.snapshotView.frame = self.origionFrame;self.transView.frame = self.transViewFrame;self.transView.layer.cornerRadius = 12;} completion:^(BOOL finished) {[toView removeFromSuperview];self.presentVC.view.alpha = 1;[self.snapshotView removeFromSuperview];[self.presentVC completeTransitionWithView:self.transView data:self.transmidData];[self.delegate completeTransition];self.interacting = NO;[self cancelInteractiveTransition];[self.transitionContext completeTransition:NO];}];} else {CGRect cFrame = [self.snapshotView convertRect:self.transView.frame toView:containerView];[containerView addSubview:self.transView];self.transView.frame = cFrame;NSTimeInterval duration = self.animationDuration;[UIView animateKeyframesWithDuration:duration delay:0 options:UIViewKeyframeAnimationOptionCalculationModeLinear animations:^{[UIView addKeyframeWithRelativeStartTime:0 relativeDuration:0.1 animations:^{self.snapshotView.alpha = 0;}];[UIView addKeyframeWithRelativeStartTime:0.1 relativeDuration:1 animations:^{[self.delegate makeupAnimationStateTransmitView:self.transViewdata:self.transmidDatacontainerView:containerView];}];} completion:^(BOOL finished) {[self.snapshotView removeFromSuperview];[self.delegate completeTransitionWithView:self.transView data:self.transmidData];self.interacting = NO;[self finishInteractiveTransition];[self.transitionContext completeTransition:YES];}];}break;}default:break;}
}
@end```![请添加图片描述](https://img-blog.csdnimg.cn/direct/c1e3f47c8be74f6d95a9062735b2d36e.gif)