iOS 导航转场动画

1.前言：

导航控制器的push,pop的动画默认是推过来，然后返回来，但是ios7后 就可以修改导航的转场动画了，导航，tab 都可以自定义动画  ，昨天心血来潮做了一个demo，研究的不是很深，就给自己做个笔记。

iOS7后有这个协议UIViewControllerAnimatedTransitioning 来修改转场动画 必须实现两个协议方法

// This is used for percent driven interactive transitions, as well as for container controllers that have companion animations that might need to

// synchronize with the main animation. 

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext;

// This method can only  be a nop if the transition is interactive and not a percentDriven interactive transition.
- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext;

2.准备：

a.两个试图控制器 

  b.一个动画类别

3.代码

appdelegate

self.window = [[UIWindow alloc]initWithFrame:[UIScreen mainScreen].bounds];
[self.window setBackgroundColor:[UIColor whiteColor]];
IndexViewController *vc = [[IndexViewController alloc] init];
UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:vc];
self.window.rootViewController = nav;
[self.window makeKeyAndVisible];
return YES;

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动画类

Animator.h
实现 UIViewControllerAnimatedTransitioning协议 

/ This is used for percent driven interactive transitions, as well as for container controllers that have companion animations that might need to

// synchronize with the main animation. 

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext;

// This method can only  be a nop if the transition is interactive and not a percentDriven interactive transition.

- (void)animateTransition:(id <UIViewControllerContextTransitioning>)transitionContext;

完整代码：

//
//  Animator.h
//  demo
//
//  Created by linpeng on 14-9-18.
//  Copyright (c) 2014年 linpeng. All rights reserved.

#import <Foundation/Foundation.h>

@interface Animator : NSObject <UIViewControllerAnimatedTransitioning>
@property(nonatomic)int type;
@property(nonatomic,strong)UIView *view;
@end

</pre><p style="margin-top: 0px; margin-bottom: 0px; font-size: 11px; font-family: Menlo; color: rgb(0, 132, 0);"><pre name="code" class="html">//
//  Animator.m
//  demo
//
//  Created by linpeng on 14-9-18.
//  Copyright (c) 2014年 linpeng. All rights reserved.
//

#import "Animator.h"
@interface Animator()
{
CGRect rect;
}
@property(nonatomic,strong)UIView *snapshotView;
@end

@implementation Animator

- (NSTimeInterval)transitionDuration:(id <UIViewControllerContextTransitioning>)transitionContext
{
if (self.type == 0)
return 1;
else
return 1;
}
-(void)setView:(UIView *)view
{
if (_view!=view) {
_view = view;
}
rect = view.frame;
}
- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext
{
UIViewController* toViewController = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
UIViewController* fromViewController = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
[[transitionContext containerView] addSubview:toViewController.view];
toViewController.view.alpha = 0;

//push
if (self.type == 0)
{
[UIView animateWithDuration:[self transitionDuration:transitionContext]*(2.0/3) delay:0 usingSpringWithDamping:0.3 initialSpringVelocity:0.8 options:UIViewAnimationOptionAllowUserInteraction
animations:^{
self.view.center = CGPointMake([UIScreen mainScreen].bounds.size.width/2, [UIScreen mainScreen].bounds.size.height/2);
CGAffineTransform trans =  CGAffineTransformMakeScale(5,5);
self.view.transform = trans;

fromViewController.view.transform = CGAffineTransformMakeScale(0.3, 0.3);
} completion:^(BOOL finished) {

[UIView animateWithDuration:[self transitionDuration:transitionContext]*(1.0/3) animations:^{
fromViewController.view.transform = CGAffineTransformMakeScale(0.5, 0.5);
toViewController.view.alpha = 1;
}completion:^(BOOL finished) {
fromViewController.view.transform = CGAffineTransformIdentity;
self.view.transform = CGAffineTransformIdentity;
self.view.frame = rect;
[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
}];
}];

}
else//pop
{
[UIView animateWithDuration:[self transitionDuration:transitionContext]*(1.0/3) animations:^{
fromViewController.view.transform = CGAffineTransformMakeScale(2, 2);
} completion:^(BOOL finished) {

[UIView animateWithDuration:[self transitionDuration:transitionContext]*(1/3.0) delay:0 usingSpringWithDamping:0.3 initialSpringVelocity:0.8 options:UIViewAnimationOptionAllowUserInteraction
animations:^{
fromViewController.view.transform = CGAffineTransformMakeScale(0, 0);
}completion:^(BOOL finished) {
toViewController.view.alpha = 1;
fromViewController.view.transform = CGAffineTransformIdentity;
[transitionContext completeTransition:![transitionContext transitionWasCancelled]];
}];

}];
}

}

@end

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IndexViewController

设置导航的代理 

//导航代理

    self.navigationController.delegate =self;

实例化动画类

//动画

    self.animalPush = [[Animatoralloc]init];

    self.animalPush.type =0;

    self.animalPop = [[Animatoralloc]init];

    self.animalPop.type =1;

然后代理里面实现

-(id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController
*)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController
*)toVC
{

    if (operation ==UINavigationControllerOperationPush)
    {
       returnself.animalPush;
    }
   else
    {
       returnself.animalPop;
    }

    return
nil;
}

完整类

//
//  IndexViewController.h
//  demo
//
//  Created by linpeng on 14-9-18.
//  Copyright (c) 2014年 linpeng. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface IndexViewController : UIViewController
@end

//
//  IndexViewController.m
//  demo
//
//  Created by linpeng on 14-9-18.
//  Copyright (c) 2014年 linpeng. All rights reserved.
//

#import "IndexViewController.h"
#import "ViewController.h"
#import "Animator.h"

#define RGBCOLOR(r,g,b) [UIColor colorWithRed:(r)/255.0f green:(g)/255.0f blue:(b)/255.0f alpha:1]
//主色调
#define kMAINCOLOR  RGBCOLOR(86,206,186)

@interface IndexViewController ()<UIViewControllerTransitioningDelegate, UINavigationControllerDelegate, UITabBarControllerDelegate>
@property(nonatomic,strong) Animator *animalPush,*animalPop;
@end

@implementation IndexViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}

- (void)viewDidLoad
{
[super viewDidLoad];
[self.view setBackgroundColor:[UIColor whiteColor]];
//动画
self.animalPush = [[Animator alloc] init];
self.animalPush.type = 0;
self.animalPop = [[Animator alloc] init];
self.animalPop.type = 1;

//导航代理
self.navigationController.delegate = self;

float w = [UIScreen mainScreen].bounds.size.width;
for (int i = 0; i<6; i++)
{
UIView *view = [[UIView alloc]initWithFrame:CGRectMake((w/6+5)*i, 100, 50,50)];
[view setBackgroundColor:kMAINCOLOR];
[self.view addSubview:view];
}

}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
UITouch *touch = touches.anyObject;
UIView *view = [touch view];
self.animalPush.view = view;

ViewController *vc = [[ViewController alloc]init];
[self.navigationController pushViewController:vc animated:YES];
}
- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
-(id<UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController animationControllerForOperation:(UINavigationControllerOperation)operation fromViewController:(UIViewController *)fromVC toViewController:(UIViewController *)toVC
{
if (operation == UINavigationControllerOperationPush)
{
return self.animalPush;
}
else
{
return self.animalPop;
}
return nil;
}

@end

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ViewController
 完整类

//
//  ViewController.h
//  demo
//
//  Created by linpeng on 14-9-18.
//  Copyright (c) 2014年 linpeng. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController
@end

//
//  ViewController.m
//  demo
//
//  Created by linpeng on 14-9-18.
//  Copyright (c) 2014年 linpeng. All rights reserved.
//

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad
{
[super viewDidLoad];

[self.view setBackgroundColor:[UIColor whiteColor]];

UILabel *lab = [[UILabel alloc] initWithFrame:self.view.bounds];
lab.text = @"Hello World";
lab.textAlignment = NSTextAlignmentCenter;
[self.view addSubview:lab];

}
-(void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
[self.navigationController popToRootViewControllerAnimated:YES];
}

- (void)didReceiveMemoryWarning
{
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}

@end

效果