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youxiaomingbai
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cardLayout
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‎CardLayout.h

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//
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// LineLayout.h
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// TestCollection
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//
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// Created by Eric on 15/5/14.
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// Copyright (c) 2015年 eric. All rights reserved.
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//
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#import <UIKit/UIKit.h>
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@class CardLayout;
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@protocol LinlayoutDelegate<NSObject>
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@optional
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-(void) CardLayout:(CardLayout *)CardLayout didscrollToItematRow:(NSInteger)row;
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@end
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@interface CardLayout : UICollectionViewFlowLayout
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@property (weak,nonatomic)id <LinlayoutDelegate> delegate;
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@property (nonatomic,assign) int LineSpace;
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@property (nonatomic,assign) float Zoom;
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@end

‎CardLayout.m

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//
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// LineLayout.m
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// TestCollection
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//
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// Created by Eric on 15/5/14.
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// Copyright (c) 2015年 eric. All rights reserved.
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//
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#import "CardLayout.h"
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@interface CardLayout ()
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@property (nonatomic,strong ) UICollectionViewLayoutAttributes* attributes;
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@end
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#define RIDO_TO_5S [[UIScreen mainScreen] bounds].size.width / 320.0
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#define ITEM_SIZE_HEIGHT 267.0
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#define ITEM_SIZE_WIDTH 205.0
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@implementation CardLayout
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#define ACTIVE_DISTANCE 100
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#define ZOOM_FACTOR 0.4
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-(id)init
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{
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self = [super init];
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if (self) {
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self.itemSize = CGSizeMake(ITEM_SIZE_WIDTH*RIDO_TO_5S, ITEM_SIZE_HEIGHT*RIDO_TO_5S);
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self.scrollDirection = UICollectionViewScrollDirectionVertical;
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self.sectionInset = UIEdgeInsetsMake(130*RIDO_TO_5S, 0.0, 180*RIDO_TO_5S, 0.0);
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self.LineSpace = -237;
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self.Zoom = ZOOM_FACTOR;
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self.minimumLineSpacing = self.LineSpace*RIDO_TO_5S ;
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}
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return self;
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}
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- (BOOL)shouldInvalidateLayoutForBoundsChange:(CGRect)oldBounds
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{
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return YES;
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}
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-(NSArray*)layoutAttributesForElementsInRect:(CGRect)rect
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{
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NSArray* array = [super layoutAttributesForElementsInRect:rect];
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CGRect visibleRect;
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visibleRect.origin = self.collectionView.contentOffset;
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visibleRect.size = self.collectionView.bounds.size;
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for (UICollectionViewLayoutAttributes* attributes in array) {
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attributes.zIndex = attributes.indexPath.row;//z轴排序
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if (CGRectIntersectsRect(attributes.frame, rect)) {
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CGFloat distance = CGRectGetMidY(visibleRect) - attributes.center.y;
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CGFloat normalizedDistance = distance / ACTIVE_DISTANCE;
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CGFloat zoom = 1 + self.Zoom*(1 - ABS(normalizedDistance));
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if (ABS(distance) < 30) {
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if (attributes != nil && self.attributes.indexPath.row !=attributes.indexPath.row) {
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self.attributes = [attributes copy];
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if ([_delegate respondsToSelector:@selector(CardLayout:didscrollToItematRow:)]) {
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[_delegate CardLayout:self didscrollToItematRow:(int)self.attributes.indexPath.row];
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}
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}
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// NSLog(@"%ld",(long)self.attributes.indexPath.row);
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for ( UICollectionViewLayoutAttributes* attributes in array) {
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if (attributes.indexPath.row>self.attributes.indexPath.row+1||attributes.indexPath.row<self.attributes.indexPath.row-7) {
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attributes.transform3D = CATransform3DMakeScale(zoom, zoom, 1.0);
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attributes.hidden = YES;
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}else if (attributes.indexPath.row<self.attributes.indexPath.row){
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int alphaindex ;
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alphaindex = (int)(self.attributes.indexPath.row-attributes.indexPath.row);
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attributes.alpha =(7-alphaindex)*0.2;
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//修改间距代码
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// attributes.transform3D = CATransform3DIdentity;
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// CGRect frame = attributes.frame;
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//
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// switch (alphaindex) {
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// case 1:
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// frame.origin.y -= 10;
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// break;
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// case 2:
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// frame.origin.y -= 3;
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// break;
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// case 3:
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// break;
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// case 4:
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// frame.origin.y += 10;
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// break;
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// case 5:
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// frame.origin.y += 20;
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// break;
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// case 6:
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// frame.origin.y += 30;
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// break;
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//
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//
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// default:
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//
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// break;
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// }
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//
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// attributes.frame = frame;
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CGFloat distance = CGRectGetMidY(visibleRect) - attributes.center.y;
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CGFloat normalizedDistance = distance / ACTIVE_DISTANCE;
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CGFloat zoom = 1 + self.Zoom*(1 - ABS(normalizedDistance));
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attributes.transform3D = CATransform3DMakeScale(zoom, zoom, 1.0);
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}else if (attributes.indexPath.row ==self.attributes.indexPath.row+1 ){
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CGFloat distance = CGRectGetMidY(visibleRect) - attributes.center.y;
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CGFloat normalizedDistance = distance / ACTIVE_DISTANCE;
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CGFloat zoom = 1+ self.Zoom*(1 - ABS(normalizedDistance));
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int z =(int)(zoom*1000);
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// NSLog(@"%d",z);
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attributes.transform3D =CATransform3DIdentity ;
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CGRect frame;
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frame = attributes.frame;
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frame.origin.y +=1.8*abs(1400-z)*RIDO_TO_5S;
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attributes.frame = frame;
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attributes.transform3D = CATransform3DMakeScale(1.4, 1.4, 1.0) ;
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}
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else if (self.attributes.indexPath.row == attributes.indexPath.row){
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attributes.transform3D =CATransform3DIdentity ;
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CGFloat distance = CGRectGetMidY(visibleRect) - attributes.center.y;
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CGFloat normalizedDistance = distance / ACTIVE_DISTANCE;
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CGFloat zoom = 1 + self.Zoom*(1 - ABS(normalizedDistance));
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attributes.transform3D = CATransform3DMakeScale(1.4, 1.4, 1.0);
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}
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}
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}
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}
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}
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for ( UICollectionViewLayoutAttributes* attributes in array) {
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CGFloat distance = CGRectGetMidY(visibleRect) - attributes.center.y;
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if (attributes.indexPath.row>self.attributes.indexPath.row+1||attributes.indexPath.row<self.attributes.indexPath.row-7) {
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// CGFloat distance = CGRectGetMidY(visibleRect) - attributes.center.y;
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CGFloat normalizedDistance = distance / ACTIVE_DISTANCE;
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CGFloat zoom = 1 + self.Zoom*(1 - ABS(normalizedDistance));
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attributes.transform3D = CATransform3DMakeScale(zoom, zoom, 1.0);
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attributes.hidden = YES;
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}else if (attributes.indexPath.row<self.attributes.indexPath.row){
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int alphaindex ;
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alphaindex = (int)(self.attributes.indexPath.row-attributes.indexPath.row);
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attributes.alpha =(7-alphaindex)*0.2;
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CGFloat distance = CGRectGetMidY(visibleRect) - attributes.center.y;
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CGFloat normalizedDistance = distance / ACTIVE_DISTANCE;
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CGFloat zoom = 1 + self.Zoom*(1 - ABS(normalizedDistance));
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attributes.transform3D = CATransform3DMakeScale(zoom, zoom, 1.0);
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}else if (attributes.indexPath.row ==self.attributes.indexPath.row+1 ){
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CGFloat distance = CGRectGetMidY(visibleRect) - attributes.center.y;
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CGFloat normalizedDistance = distance / ACTIVE_DISTANCE;
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CGFloat zoom = 1+ self.Zoom*(1 - ABS(normalizedDistance));
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int z =(int)(zoom*1000);
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// NSLog(@"%d",z);
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attributes.transform3D =CATransform3DIdentity ;
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CGRect frame;
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frame = attributes.frame;
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frame.origin.y +=0.2*abs(1400-z)*RIDO_TO_5S;
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attributes.frame = frame;
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attributes.transform3D =CATransform3DMakeScale(1.4, 1.4, 1.0) ;
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}
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else if (self.attributes.indexPath.row == attributes.indexPath.row){
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attributes.transform3D =CATransform3DIdentity ;
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CGFloat distance = CGRectGetMidY(visibleRect) - attributes.center.y;
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CGFloat normalizedDistance = distance / ACTIVE_DISTANCE;
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CGFloat zoom = 1 + self.Zoom*(1 - ABS(normalizedDistance));
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attributes.transform3D = CATransform3DMakeScale(1.4, 1.4, 1.0);
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}
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}
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return array;
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}
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- (CGPoint)targetContentOffsetForProposedContentOffset:(CGPoint)proposedContentOffset withScrollingVelocity:(CGPoint)velocity
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{
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CGFloat offsetAdjustment = MAXFLOAT;
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CGFloat horizontalCenter = proposedContentOffset.y + (CGRectGetHeight(self.collectionView.bounds) / 2.0);
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CGRect targetRect = CGRectMake(0.0, proposedContentOffset.y, self.collectionView.bounds.size.width, self.collectionView.bounds.size.height);
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NSArray* array = [super layoutAttributesForElementsInRect:targetRect];
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for (UICollectionViewLayoutAttributes* layoutAttributes in array) {
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CGFloat itemHorizontalCenter = layoutAttributes.center.y;
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if (ABS(itemHorizontalCenter - horizontalCenter) < ABS(offsetAdjustment)) {
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offsetAdjustment = itemHorizontalCenter - horizontalCenter;
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//调整
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}
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}
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return CGPointMake(proposedContentOffset.x, proposedContentOffset.y + offsetAdjustment );
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}
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@end

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