IOS转场动画

最近项目做完了，就进入无休止的修改中了。也顺便在看swift。学到了两个转场动画，也给大家看看
PS：其实我一直以为转场动画又难又不实用，哈哈

转场动画1: （先看效果图）

XXX.gif
这种转场方式跟boss直聘的应该差不多，所有就收集了 屏幕快照 2017-01-09 下午4.52.28.png

先说说建的类的用处吧： ViewController：第一个控制器 BViewController：push出来的第二个控制器 PushAnimateion：继承NSObject的工具类，用于修改push动画 PopAnimateion：继承NSObject的工具类，用于修改Pop动画
下面给出ViewController里面代码和PushAnimateion里面具体代码，另外两个类似，只上截图。另外，ViewController的导航栏是在storyboard里面直接加的 ViewController .m：

#import "ViewController.h"
#import "BViewController.h"
#import "PushAnimateion.h"

@interface ViewController ()<UINavigationControllerDelegate>

@end

@implementation ViewController

//这个控制器的代理一定要在viewWillAppear里面设置
//因为每次push的时候控制器不会dealloc
//所以如果写在viewDidLoad里面的话在pop回来的时候就不会再次执行代理，动画就会失效
- (void)viewWillAppear:(BOOL)animated {
    [super viewWillAppear:animated];
    self.navigationController.delegate = self;
}

- (void)viewDidLoad {
    [super viewDidLoad];
    
    //设置背景图片
    self.view.layer.contents = (__bridge id _Nullable)([UIImage imageNamed:@"4"].CGImage);
    
    self.navigationController.navigationBar.hidden = YES;
}

- (void)touchesBegan:(NSSet<UITouch *> *)touches withEvent:(UIEvent *)event {
    BViewController *view = [BViewController new];
    [self.navigationController pushViewController:view animated:YES];
}

//需要返回的是一个id类型的且遵循UIViewControllerAnimatedTransitioning协议的
- (nullable id <UIViewControllerAnimatedTransitioning>)navigationController:(UINavigationController *)navigationController
                                            animationControllerForOperation:(UINavigationControllerOperation)operation
                                                         fromViewController:(UIViewController *)fromVC
                                                           toViewController:(UIViewController *)toVC {
    //根据类型返回对应动画
    if (operation == UINavigationControllerOperationPush) {
        return [PushAnimateion new];
    }else {
        return nil;
    }
}

@end

PushAnimateion里面代码：

//这是.h里面的，要遵循这个协议，不然UINavigationControllerDelegate返回这个类的对象会报错，所以写在.h里面
#import <Foundation/Foundation.h>
#import <UIKit/UIKit.h>

@interface PushAnimateion : NSObject<UIViewControllerAnimatedTransitioning>

@end

//.m里面代码
#import "PushAnimateion.h"

#define WIDTH [UIScreen mainScreen].bounds.size.width
#define HEIGHT [UIScreen mainScreen].bounds.size.height

@interface PushAnimateion ()<CAAnimationDelegate>

@property (nonatomic, retain) id<UIViewControllerContextTransitioning> transitionContext;

@end

@implementation PushAnimateion

- (NSTimeInterval)transitionDuration:(id<UIViewControllerContextTransitioning>)transitionContext {
    return .5;
    
}

- (void)animateTransition:(id<UIViewControllerContextTransitioning>)transitionContext {
    self.transitionContext = transitionContext;
    
    UIViewController *toVC = [transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    UIViewController *fromVC = [transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    
    [[transitionContext containerView] addSubview:fromVC.view];
    [[transitionContext containerView] addSubview:toVC.view];
    
    UIBezierPath *starPath = [UIBezierPath bezierPathWithRect:CGRectMake(0, HEIGHT*0.5, WIDTH, 1)];
    UIBezierPath *endPath  = [UIBezierPath bezierPathWithRect:CGRectMake(0, 0, WIDTH, HEIGHT)];
    
    CAShapeLayer *maskLayer = [[CAShapeLayer alloc]init];
    maskLayer.path = endPath.CGPath;
    toVC.view.layer.mask = maskLayer;
    
    CABasicAnimation *animate = [CABasicAnimation animationWithKeyPath:@"path"];
    animate.fromValue = (__bridge id _Nullable)(starPath.CGPath);
    animate.toValue = (__bridge id _Nullable)(endPath.CGPath);
    animate.duration = [self transitionDuration:transitionContext];
    animate.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut];
    animate.delegate = self;
    [maskLayer addAnimation:animate forKey:@"path"];
}

- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag {
    [self.transitionContext completeTransition:![self.transitionContext transitionWasCancelled]];
    
    [self.transitionContext viewControllerForKey:UITransitionContextToViewControllerKey].view.layer.mask = nil;
    [self.transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey].view.layer.mask = nil;
}

@end

如果建的类名相同，可以直接把代码拖到项目里，代码都拷贝齐全的 下面给两张图片是BViewController的m文件和PopAnimateion的m文件。PopAnimateion的h文件里跟PushAnimateion里面是一样的，代码基本一样，可以复制过去直接用

屏幕快照 2017-01-09 下午5.05.36.png 屏幕快照 2017-01-09 下午5.05.50.png
该项目有一点点小bug，就是pop回来的时候会闪一下，求大神解决了告知，😄

转场动画2:

xx.gif

这个效果是系统自带的动画，做的比较粗糙，需要使用的朋友可以自己再修复一下 这个比较简单，直接上代码然后说一下就好了

rootViewController的.m里面代码

#import "ViewController.h"
#import "AViewController.h"
#import "BViewController.h"

@interface ViewController ()

@property (nonatomic, assign) NSInteger currentChildNumber;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.currentChildNumber = 0;
    [self addChildViewController:[AViewController new]];
    [self addChildViewController:[BViewController new]];
    
    [self.view addSubview:self.childViewControllers.firstObject.view];
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(getNotification) name:@"push" object:nil];
}

- (void)getNotification {
    [self transitionFromViewController:self.currentChildNumber == 0 ? self.childViewControllers.firstObject : self.childViewControllers.lastObject
                      toViewController:self.currentChildNumber == 1 ? self.childViewControllers.firstObject : self.childViewControllers.lastObject
                              duration:1
                               options:self.currentChildNumber == 0 ? UIViewAnimationOptionTransitionFlipFromLeft : UIViewAnimationOptionTransitionFlipFromRight
                            animations:nil
                            completion:nil];
    self.currentChildNumber = (self.currentChildNumber + 1) % 2;
}

@end

只需要另外新建两个控制器，在touchBegin里面发个通知，这里接收就OK

需要代码的可以加群：515385179(群里都没有人，来点大神救救我吧😄)
我是小白，有没有收徒的，我报名😂