iOS_动画_实例(3)_转场动画_元素切换

一丶效果

1.gif

OneViewController 的 ImageView和label 切换到TwoViewController的转场动画;

二丶原理及实现方式;

利用的自定义UIViewControllerAnimatedTransitioning方法;
实现方式:
1.OneVc上有:oneImageView;
2.TwoVc上有:twoImageView;
通过截图oneImageView生成view添加到containerView;
对containerView做过渡动画即可;

三丶代码

自己封装了一个XZB_Transition(https://github.com/k373379320/ZBTransitionTest)

使用:

//翻转OneVc
1.
#import "ZC1ViewController.h"
2.
添加UINavigationControllerDelegate>
3.
self.navigationController.delegate = self;
4.
#pragma mark 
- (id )navigationController:(UINavigationController *)navigationController
                                   animationControllerForOperation:(UINavigationControllerOperation)operation
                                                fromViewController:(UIViewController *)fromVC
                                                  toViewController:(UIViewController *)toVC{
    
    if ([toVC isKindOfClass:[ZC2ViewController class]]) {
        
        XZB_Transition *transition = [XZB_Transition transitionWithViewArray:@[@[@"mainImageView",@"mainImageView"],@[@"titleLabel",@"titleLabel"]]];
        
        return transition;
    }else{
        return nil;
    }
}

注意:

就一个类方法;使用注意格式别错了,没有容错代码,按格式来;
由于采用kvc的方式实现,格式如下:
传入:二维数组,@[@[原图控件name1,结果图控件name1],@[原图控件name2,结果图控件name2]];
例子:
@[@[@"mainImageView",@"mainImageView"]]
+ (instancetype)transitionWithViewArray:(NSArray *)array;

四丶,代码讲解:

#import "XZB_Transition.h"
#import "UIView+MotionBlur.h"
#import "UIImage+Capture.h"

@interface XZB_Transition ()

@property (nonatomic, strong) NSArray *transitionViewArray;


@end

@implementation XZB_Transition

#pragma mark - 生命周期

#pragma mark - api
+ (instancetype)transitionWithViewArray:(NSArray *)array
{
    XZB_Transition *transition = [[XZB_Transition alloc]init];
    transition.transitionViewArray = array;
    return transition;
}
#pragma mark - getter / setter


#pragma mark - model event

#pragma mark - view event

#pragma mark - private

/**
 动画持续时间
 */
- (NSTimeInterval)transitionDuration:(id )transitionContext
{
    return 0.7f;
}

- (void)animateTransition:(id )transitionContext
{
    //获取从哪里来的控制器
    UIViewController *fromVC = (UIViewController *)[transitionContext viewControllerForKey:UITransitionContextFromViewControllerKey];
    //获取到哪里去的控制器
    UIViewController *toVC   = (UIViewController *)[transitionContext viewControllerForKey:UITransitionContextToViewControllerKey];
    toVC.view.frame = [transitionContext finalFrameForViewController:toVC];
    toVC.view.alpha = 0;
    
    //转场需要动画的视图数组
    NSMutableArray *animationViewsArray = [[NSMutableArray alloc] init];
    
    //做动画的视图,注意添加顺序,层次;
    UIView *containerView = [transitionContext containerView];
    [containerView addSubview:toVC.view];
    @autoreleasepool {
        for (NSArray *startToEndViewArray in self.transitionViewArray)
        {
            //来源视图处理指针
            UIView *fromVcAnimationView = nil;
            //最终视图处理指针
            UIView *toVcAnimationView = nil;
            //做动画的视图指针
            UIImageView *animationImageView = nil;
            {
                fromVcAnimationView = [fromVC valueForKey:startToEndViewArray[0]];
                //截图
                animationImageView = [[UIImageView alloc] initWithImage:[UIImage captureWithView:fromVcAnimationView]];
                animationImageView.frame = fromVcAnimationView.frame;
                [containerView addSubview:animationImageView];
            }
            
            toVcAnimationView  =  [toVC valueForKey:startToEndViewArray[1]];
            fromVcAnimationView.hidden = YES;
            toVcAnimationView.hidden = YES;
            
            //原图,结果图,动画图
            [animationViewsArray addObject:@[fromVcAnimationView,toVcAnimationView,animationImageView]];
        }
        
    }
    
    //动画效果
    NSTimeInterval duration = [self transitionDuration:transitionContext];
    
    [UIView animateWithDuration:duration delay:0.0f usingSpringWithDamping:0.7f initialSpringVelocity:1.0f options:UIViewAnimationOptionCurveLinear animations:^{
        
        toVC.view.alpha = 1.0;
        for (NSArray *animationArray in animationViewsArray)
        {
            UIImageView *animationImageView = animationArray[2];
            UIView *resultsView =  animationArray[1];
            //frame变换
            animationImageView.frame = [containerView convertRect:resultsView.frame fromView:resultsView.superview];
        }
        
        
    } completion:^(BOOL finished) {
        if (!finished)return ;
        
        for (NSArray *animationArray in animationViewsArray)
        {
            UIView *fromVcAnimationView = animationArray[0];
            UIView *toVcAnimationView = animationArray[1];
            UIImageView *animationImageView = animationArray[2];
            
            fromVcAnimationView.hidden = NO;
            toVcAnimationView.hidden = NO;
            //删除做动画view
            [animationImageView removeFromSuperview];
        }
        //结束动画,必须调用;
        [transitionContext completeTransition:!transitionContext.transitionWasCancelled];
    }];
    
}

XZB_Transition: XZB_Transition