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iOS – 图片实现多层折叠效果

    本文是投稿文章,作者:Resory序在网上能找到挺多图片折叠效果的教程,但大多数是一层折叠,在他们的教程的基础上,我试着实现了一下多层折叠的效果。操作如下~效果DemoDemo地址:https://github.com/Resory/RYMutipleFoldImageView如果官人喜欢的话不妨给个星星吧。逻辑在做图片折叠效果的时候,我们可以理解为把图片分成几部分,然后分别对各部分做动效来实现折叠效果。根据动态图,可以看到这是一张大图"分成"4个小imageView。从上至下,我们分别命名为one,two,three,four对one,two,three,four这四个小imageView进行旋转+移动。旋转的时候,关键是看各个imageView的anchorPoint是多少.而我们这里,可看p1图中的红点。   1.a1代表one的anchorPoint为(0.5,0.0)   2.a2代表two的anchorPoint为(0.5,1.0)   3.a3代表three的anchorPoint为(0.5,0.0)   4.a4代表four的anchorPoint为(0.5,1.0)旋转:我们这里的imageView都是旋转45°或者是-45°,这个用CATransform3DRotate即可完成。移动(关键):   1.旋转后,各个imageView都会变形并且都一样大小,只有位置不一样,我们要根据这个旋转后的imageView高度来进行移动。   2.比如two要和one对接。根据动态图,one只有旋转,没有移动。而two则旋转和移动了。那么移动了多少呢。在没有折叠前,所有的imageView高度都是50px。也就是one和two总共加起来是100px。而折叠后。one和two都变小了。就是因为他们两个都变小了。所以中间就出现了缝隙,这个缝隙就是我们要移动的距离。而我们知道在二维空间中,总长度是100px,one,two的高度在旋转后是可以算出来的,也就是说缝隙的二维空间距离是:100-2*(one.frame.size.height)。,然后再经过CATransform3DMakeAffineTransform方法的转换得到真实地三维空间移动的距离。实现初始化4个小imageView(contentsRect的运用)- (void)configFourFoldImage

{
    UIView bgView = [[UIView alloc] initWithFrame:CGRectMake(10, 100, 300, IMAGE_PER_HEIGIT4)];
    [self.view addSubview:bgView];
    
    // 把kiluya这张图,分成平均分成4个部分的imageview    _one = [[UIImageView alloc] init];
    _one.image = [UIImage imageNamed:@"Kiluya.jpg"];
    _one.layer.contentsRect = CGRectMake(0, 0, 1, 0.25);
    _one.layer.anchorPoint = CGPointMake(0.5, 0.0);
    _one.frame = CGRectMake(0, 0, 300, IMAGE_PER_HEIGIT);
    
    _two = [[UIImageView alloc] init];
    _two.image = [UIImage imageNamed:@"Kiluya.jpg"];
    _two.layer.contentsRect = CGRectMake(0, 0.25, 1, 0.25);
    _two.layer.anchorPoint = CGPointMake(0.5, 1.0);
    _two.frame = CGRectMake(0, IMAGE_PER_HEIGIT, 300, IMAGE_PER_HEIGIT);
    
    _three = [[UIImageView alloc] init];
    _three.image = [UIImage imageNamed:@"Kiluya.jpg"];
    _three.layer.contentsRect = CGRectMake(0, 0.5, 1, 0.25);
    _three.layer.anchorPoint = CGPointMake(0.5, 0.0);
    _three.frame = CGRectMake(0, IMAGE_PER_HEIGIT*2, 300, IMAGE_PER_HEIGIT);
    
    _four = [[UIImageView alloc] init];
    _four.image = [UIImage imageNamed:@"Kiluya.jpg"];
    _four.layer.contentsRect = CGRectMake(0, 0.75, 1, 0.25);
    _four.layer.anchorPoint = CGPointMake(0.5, 1.0);
    _four.frame = CGRectMake(0, IMAGE_PER_HEIGIT*3, 300, IMAGE_PER_HEIGIT);
    
    [bgView addSubview:_one];
    [bgView addSubview:_two];
    [bgView addSubview:_three];
    [bgView addSubview:_four];
    
    // 给第一张和第三张添加阴影
    _oneShadowView = [[UIView alloc] initWithFrame:_one.bounds];
    _oneShadowView.backgroundColor = [UIColor blackColor];
    _oneShadowView.alpha = 0.0;
    
    _threeShadowView = [[UIView alloc] initWithFrame:_three.bounds];
    _threeShadowView.backgroundColor = [UIColor blackColor];
    
    _threeShadowView.alpha = 0.0;
    [_one addSubview:_oneShadowView];
    [_three addSubview:_threeShadowView];
}生成折叠动效需要的CATransform3D- (CATransform3D)config3DTransformWithRotateAngle:(double)angle andPositionY:(double)y
{
    CATransform3D transform = CATransform3DIdentity;
    // 立体
    transform.m34 = -1/1000.0;
    // 旋转    CATransform3D rotateTransform = CATransform3DRotate(transform, M_PI*angle/180, 1, 0, 0);
    // 移动(这里的y坐标是平面移动的的距离,我们要把他转换成3D移动的距离.这是关键,没有它,图片就没办法很好地对接。)
    CATransform3D moveTransform = CATransform3DMakeAffineTransform(CGAffineTransformMakeTranslation(0, y));
    // 合并
    CATransform3D concatTransform = CATransform3DConcat(rotateTransform, moveTransform);
    return concatTransform;
}折叠// 动效是否执行中
static bool isFolding = NO;

- (IBAction)fold:(id)sender
{
    if(!isFolding)
    {
        isFolding = YES;
        
        [UIView animateWithDuration:1.0
                              delay:0
             usingSpringWithDamping:1.0
              initialSpringVelocity:0
                            options:UIViewAnimationOptionCurveLinear
                         animations:^{
     &nb
sp;                   
&
nbsp;           // 阴影显示
            _oneShadowView.alpha = 0.2;
            _threeShadowView.alpha = 0.2;
            
            // 折叠
            _one.layer.transform = [self config3DTransformWithRotateAngle:-45.0
                                                             andPositionY:0];
            _two.layer.transform = [self config3DTransformWithRotateAngle:45.0                                                             andPositionY:-100+2*_one.frame.size.height];
            _three.layer.transform = [self config3DTransformWithRotateAngle:-45.0
                                                               andPositionY:-100+2*_one.frame.size.height];
            _four.layer.transform = [self config3DTransformWithRotateAngle:45.0
                                                              andPositionY:-200+4*_one.frame.size.height];
        } completion:^(BOOL finished) {
            if(finished)
            {
                isFolding = NO;
            }
        }];
    }
}恢复- (IBAction)reset:(id)sender{
    isFolding = NO;
    [UIView animateWithDuration:1.0
                          delay:0
         usingSpringWithDamping:1.0
          initialSpringVelocity:0
                        options:UIViewAnimationOptionCurveLinear
                     animations:^{
                     
        // 阴影隐藏
        _oneShadowView.alpha = 0.0;
        _threeShadowView.alpha = 0.0;
        
        // 图片恢复原样
        _one.layer.transform = CATransform3DIdentity;
        _two.layer.transform = CATransform3DIdentity;
        _three.layer.transform = CATransform3DIdentity;
        _four.layer.transform = CATransform3DIdentity;
        
    } completion:^(BOOL finished) {
    
    }];
}末这里关键是缝隙的计算,这个想明白了。其他就没什么了。如果你有疑问或者发现错误请留言给我,喜欢就点个赞吧!3Q

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本文由 姬長信 创作,文章地址:https://blog.isoyu.com/archives/80.html
采用知识共享署名4.0 国际许可协议进行许可。除注明转载/出处外,均为本站原创或翻译,转载前请务必署名。最后编辑时间为:1月 3, 2016 at 08:25 下午

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