1、转场动画
iOS7之后开发者可以自定义界面切换的转场动画，就是在模态弹出（present、dismiss），Navigation的（push、pop），TabBar的系统切换效果之外自定义切换动画！
模态弹出自定义出push、pop效果，可以侧滑：
2、实现步骤
2.1、自定义转场动画
1》创建自定义文件
@interface CustomTransform : NSObject<UIViewControllerAnimatedTransitioning>
2》实现UIViewControllerAnimatedTransitioning方法
//设置转场时间
- (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext;
//设置转场效果
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext;
.m相关类说明：
//表示转场动画上下文
UIViewControllerContextTransitioning
//当前控制器fromVC和目标控制器toVC
//vc1-->present-->vc2: fromVC是vc1，toVC是vc2
//vc2-->dismiss-->vc1: fromVC是vc2，toVC是vc1
UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
//对应控制器的view视图
UIView *fromView =[transitionContext viewForKey:UITransitionContextFromViewKey];
UIView *toView =[transitionContext viewForKey:UITransitionContextToViewKey]; //presentingViewController,presentedViewController
vc1-->present-->vc2,vc1.presentedViewController 就是vc2；vc2.presentingViewController 就是vc1。 //更新动画进度
- (void)updateInteractiveTransition:(CGFloat)percentComplete;
//转场结束
- (void)finishInteractiveTransition;
//转场取消
- (void)cancelInteractiveTransition;
自定义文件：
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h> typedef NS_ENUM(NSInteger, PresentType){
PresentTypePresent,
PresentTypeDismiss
}; @interface CustomTransform : NSObject<UIViewControllerAnimatedTransitioning> + (instancetype)makeWithTransitionType:(PresentType)type;
- (instancetype)initWithTransitionType:(PresentType)type; @end
.h文件
#import "CustomTransform.h" @interface CustomTransform() @property(nonatomic, assign)PresentType type;
@property(nonatomic, strong)UIView *containerView;
@end @implementation CustomTransform
+ (instancetype)makeWithTransitionType:(PresentType)type
{
return [[self alloc] initWithTransitionType:type];
} - (instancetype)initWithTransitionType:(PresentType)type
{
if (self == [super init]) {
_type = type;
}
return self;
} - (NSTimeInterval)transitionDuration:(nullable id <UIViewControllerContextTransitioning>)transitionContext
{
return .;
} - (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext
{
switch (_type) {
case PresentTypePresent:
[self presentTransform:transitionContext];
break;
case PresentTypeDismiss:
[self dismissTransform:transitionContext];
break;
default:
break;
} } - (void)presentTransform:(id<UIViewControllerContextTransitioning>)transitionContext
{
UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
self.containerView = [transitionContext containerView]; UIView *fromView =[transitionContext viewForKey:UITransitionContextFromViewKey];
UIView *toView =[transitionContext viewForKey:UITransitionContextToViewKey];
[self.containerView addSubview:toView];
CGRect visibleFrame = [transitionContext initialFrameForViewController:fromVC];
CGRect rightHiddenFrame = CGRectMake( CGRectGetWidth(visibleFrame), ,CGRectGetWidth(visibleFrame),CGRectGetHeight(visibleFrame));
CGRect leftHiddenFrame =CGRectMake(- CGRectGetWidth(visibleFrame), , CGRectGetWidth(visibleFrame), CGRectGetHeight(visibleFrame));
fromView.frame = visibleFrame;
toView.frame = rightHiddenFrame;
fromView.layer.masksToBounds = toView.layer.masksToBounds = YES;
[self.containerView insertSubview:toView atIndex:];
[UIView animateWithDuration:.
animations:^{
fromView.frame = leftHiddenFrame;
toView.frame = visibleFrame;
}
completion:^(BOOL finished) {
if ([transitionContext transitionWasCancelled]) {
[toView removeFromSuperview];
}
[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
}]; } - (void)dismissTransform:(id<UIViewControllerContextTransitioning>)transitionContext
{ UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
self.containerView = [transitionContext containerView]; UIView *fromView =[transitionContext viewForKey:UITransitionContextFromViewKey];
UIView *toView =[transitionContext viewForKey:UITransitionContextToViewKey];
[self.containerView addSubview:toView];
CGRect visibleFrame = [transitionContext initialFrameForViewController:fromVC];
CGRect rightHiddenFrame = CGRectMake( CGRectGetWidth(visibleFrame), ,CGRectGetWidth(visibleFrame),CGRectGetHeight(visibleFrame));
CGRect leftHiddenFrame =CGRectMake(- CGRectGetWidth(visibleFrame), , CGRectGetWidth(visibleFrame), CGRectGetHeight(visibleFrame));
fromView.frame = visibleFrame;
toView.frame = leftHiddenFrame;
fromView.layer.masksToBounds = toView.layer.masksToBounds = YES;
[UIView animateWithDuration:.
animations:^{
fromView.frame = rightHiddenFrame;
toView.frame = visibleFrame;
}
completion:^(BOOL finished) {
if ([transitionContext transitionWasCancelled]) {
[toView removeFromSuperview];
}
[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
}];
} @end
.m文件
2.2、自定义交互手势
1》创建自定义文件
@interface CustonInteractive : UIPercentDrivenInteractiveTransition
因为UIPercentDrivenInteractiveTransition : NSObject <UIViewControllerInteractiveTransitioning>，所以自定义时继承遵循UIViewControllerInteractiveTransitioning协议的UIPercentDrivenInteractiveTransition子类！
2》相关文件：
#import <UIKit/UIKit.h> @interface CustonInteractive : UIPercentDrivenInteractiveTransition @property (nonatomic, assign) BOOL interacting; - (void)wireToViewController:(UIViewController*)viewController; @end
.h
#import "CustonInteractive.h" @interface CustonInteractive()
@property (nonatomic, strong) UIViewController *presentingVC; @end @implementation CustonInteractive
-(void)wireToViewController:(UIViewController *)viewController
{
self.presentingVC = viewController;
[self prepareGestureRecognizerInView:viewController.view];
} - (void)prepareGestureRecognizerInView:(UIView*)view {
UIPanGestureRecognizer *gesture = [[UIPanGestureRecognizer alloc] initWithTarget:self action:@selector(handleGesture:)];
[view addGestureRecognizer:gesture];
}
- (void)handleGesture:(UIPanGestureRecognizer *)gestureRecognizer {
CGFloat progress = [gestureRecognizer translationInView:gestureRecognizer.view.superview].x / (self.presentingVC.view.bounds.size.width * 1.0);
progress = MIN(1.0, MAX(0.0, progress));//把这个百分比限制在0~1之间
NSLog(@"===%lf",progress);
if (gestureRecognizer.state == UIGestureRecognizerStateBegan) {
self.interacting = YES;
[self.presentingVC dismissViewControllerAnimated:YES completion:nil];
}
else if (gestureRecognizer.state == UIGestureRecognizerStateChanged){
if (self.interacting) {
[self updateInteractiveTransition:progress];
}
}else if (gestureRecognizer.state == UIGestureRecognizerStateCancelled||gestureRecognizer.state==UIGestureRecognizerStateEnded){
if (self.interacting) {
if (progress>0.5) {
[self finishInteractiveTransition];
}else{
[self cancelInteractiveTransition];
}
self.interacting = NO;
}
}
} @end
.m
2.3、使用自定义转场动画
1》设置代理（以模态弹出为例）设置目标控制器的 transitioningDelegate
- (IBAction)present:(id)sender {
PresentedViewController *vc = [[PresentedViewController alloc] init];
vc.transitioningDelegate = self;
[_transitionController wireToViewController:vc];
[self presentViewController:vc animated:YES completion:nil];
}
附加：Navigation和TabBar代理设置（self.delegate = self）
2》实现UIViewControllerTransitioningDelegate代理方法
//设置弹出时动画协议
- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source;
//设置消失时动画协议
- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed;
//设置消失时手势协议
- (nullable id <UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id <UIViewControllerAnimatedTransitioning>)animator;
vc1的.m文件：
#import "PresentingViewController.h"
#import "CustomTransform.h"
#import "CustonInteractive.h"
#import "PresentedViewController.h" #import "SecondTransform.h"
#import "SecondInteractive.h"
@interface PresentingViewController ()<UIViewControllerTransitioningDelegate,UINavigationControllerDelegate,UITabBarControllerDelegate>{
SecondTransform *_presentAnimation;
SecondInteractive *_transitionController;
} @end @implementation PresentingViewController - (void)viewDidLoad {
[super viewDidLoad];
_presentAnimation = [SecondTransform new];
_transitionController = [SecondInteractive new];
// Do any additional setup after loading the view from its nib.
}
- (IBAction)present:(id)sender {
PresentedViewController *vc = [[PresentedViewController alloc] init];
vc.transitioningDelegate = self;
[_transitionController wireToViewController:vc];
[self presentViewController:vc animated:YES completion:nil];
}
- (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForPresentedController:(UIViewController *)presented presentingController:(UIViewController *)presenting sourceController:(UIViewController *)source
{
return _presentAnimation;
} - (nullable id <UIViewControllerAnimatedTransitioning>)animationControllerForDismissedController:(UIViewController *)dismissed
{
return [SecondTransform makeWithTransitionType:PresentTransformAnimationTypeDismissed];
} -(id<UIViewControllerInteractiveTransitioning>)interactionControllerForDismissal:(id<UIViewControllerAnimatedTransitioning>)animator {
return _transitionController.isInterraction ? _transitionController : nil;
}
@end
.m
Navigation和TabBar的代理方法：
#pragma mark---UINavigationControllerDelegate
/*
- (nullable id <UIViewControllerInteractiveTransitioning>)navigationController:(UINavigationController *)navigationController
interactionControllerForAnimationController:(id <UIViewControllerAnimatedTransitioning>) animationController NS_AVAILABLE_IOS(7_0); - (nullable id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
animationControllerForOperation:(UINavigationControllerOperation)operation
fromViewController:(UIViewController *)fromVC
toViewController:(UIViewController *)toVC NS_AVAILABLE_IOS(7_0);
*/ #pragma mark-UITabBarControllerDelegate
/*
- (nullable id <UIViewControllerInteractiveTransitioning>)tabBarController:(UITabBarController *)tabBarController
interactionControllerForAnimationController: (id <UIViewControllerAnimatedTransitioning>)animationController NS_AVAILABLE_IOS(7_0); - (nullable id <UIViewControllerAnimatedTransitioning>)tabBarController:(UITabBarController *)tabBarController
animationControllerForTransitionFromViewController:(UIViewController *)fromVC
toViewController:(UIViewController *)toVC NS_AVAILABLE_IOS(7_0);
*/
Navigation和TabBar的delegate