转场动画代码下载主要是tabBar、Navi、present ；其实它里面设置到了 主要涉及到了
动画、交互
1 . TabBar的切换
tabbarVC 里面本身含有
<UITabBarControllerDelegate>这个代理，这个时候我们定义一个id<UITabBarControllerDelegate>类型的实例MyTransitionTabbarDelegateManager是现实里面的 动画和交互，让tabBarVC的delegate=MyTransitionTabbarDelegateManager对象
下面是代码实现
MyTransitionTabbarDelegateManager
#import "MyTransitionTabbarDelegateManager.h"
#import "MyTransitionTabBarAnimator.h"
@interface MyTransitionTabbarDelegateManager ()
@property (nonatomic,strong) UIPercentDrivenInteractiveTransition * interactiveTransition;
@end
@implementation MyTransitionTabbarDelegateManager
- (instancetype)init {
if (self = [super init]) {
self.interactiveTransition = [[UIPercentDrivenInteractiveTransition alloc]init];
self.interactive = NO;
}
return self;
}
//切换动画
- (id<UIViewControllerAnimatedTransitioning>)tabBarController:(UITabBarController *)tabBarController animationControllerForTransitionFromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC {
NSInteger fromIndex = [tabBarController.viewControllers indexOfObject:fromVC];
NSInteger toIndex = [tabBarController.viewControllers indexOfObject:toVC];
NSLog(@"from:%@;to:%@",fromVC,toVC);
/* 确定方向 **/
MyTransitionTabBarAnimator * animator = [[MyTransitionTabBarAnimator alloc]init];
animator.isSlideToRight = fromIndex > toIndex?YES:NO;
return animator;
}
//交互动画
- (id<UIViewControllerInteractiveTransitioning>)tabBarController:(UITabBarController *)tabBarController interactionControllerForAnimationController:(id<UIViewControllerAnimatedTransitioning>)animationController {
if (self.interactive) {
return self.interactiveTransition;
}
return nil;
}
@end
交互主要是 通过继承 UITabBarController 来获得一个子类 然后在里面添加手势
#import "MyScrollTabBarController.h"
#import "MyTransitionTabbarDelegateManager.h"
@interface MyScrollTabBarController ()
/* 处理 页面交换 和 动画 **/
@property (nonatomic,strong) MyTransitionTabbarDelegateManager * tabBarDelegateManager;
@end
@implementation MyScrollTabBarController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
self.tabBarDelegateManager = [[MyTransitionTabbarDelegateManager alloc]init];
self.delegate = self.tabBarDelegateManager;
UIPanGestureRecognizer * pan = [[UIPanGestureRecognizer alloc]initWithTarget:self action:@selector(panAction:)];
[self.view addGestureRecognizer:pan];
NSInteger i = 0;
for (UIViewController * vc in self.viewControllers) {
NSLog(@"vc_%ld:%@",(long)i++,vc);
}
}
#pragma mark - 私有方法
- (void)panAction:(UIPanGestureRecognizer *)pan {
CGFloat translationX = [pan translationInView:self.view].x;
CGFloat progress = fabs(translationX)/CGRectGetWidth(self.view.frame);
switch (pan.state) {
case UIGestureRecognizerStateBegan: {
self.tabBarDelegateManager.interactive = YES;
/*
*根据pan的速度 来判断 滑动的方向
* 假设 两点（x1，0），（x2，0）；
* 如果 x1 -》x2 滑动，如果向右边滑动 那么 x2 > x1;那么x1-x2<0;
***/
CGFloat vX = [pan velocityInView:self.view].x;
if (vX < 0) { // 说明是向右边滑动
NSInteger tmpSelectedIndex = self.selectedIndex +1;
if (tmpSelectedIndex < self.viewControllers.count) {
self.selectedIndex = tmpSelectedIndex;
}
} else {
NSInteger tmpSelectedIndex = self.selectedIndex -1;
if (tmpSelectedIndex >= 0) {
self.selectedIndex = tmpSelectedIndex;
}
}
break;
}
case UIGestureRecognizerStateChanged: {
/* 比例的更新**/
[self.tabBarDelegateManager.interactiveTransition updateInteractiveTransition:progress];
break;
}
case UIGestureRecognizerStateEnded:
case UIGestureRecognizerStateCancelled: {
if (progress > 0.5) {
[self.tabBarDelegateManager.interactiveTransition finishInteractiveTransition];
} else {
[self.tabBarDelegateManager.interactiveTransition cancelInteractiveTransition];
}
self.tabBarDelegateManager.interactive = NO;
break;
}
default: {
break;
}
}
}
@end
里面的
动画MyTransitionTabBarAnimator主要是实现动画时间和动画交互，接下来就是交互 我们通过MyTransitionTabbarDelegateManager里面的UIPercentDrivenInteractiveTransition主要是控制百分比、取消和完成
2 . 导航的切换
也是一样我们定义一个对象遵循
<UINavigationControllerDelegate>协议的一个对象MyNaiTransitionManager来管理 里面的动画和交互
3 . present的切换
也是一样，假设 vc1 =present =》vc2，这个时候需要实现 vc2的代理
UIViewControllerTransitioningDelegate的实例MyVCTransionManager,其实我们可以要知道 在vc2 中我们才能获取到 vc1的view 和vc2的view
