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现在使用卡片效果的app很多，之前公司让实现一种卡片效果，就写了一篇关于实现卡片的文章。文章最后附有demo
实现上我选择了使用uicollectionview ；用uicollectionviewflowlayout来定制样式；下面看看具体实现
具体实现
1、创建uicollectionview
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- (void)createcollectionview {
cgfloat pading = 0 * screen_width/375;
lhleftcollocationview * layout = [[lhleftcollocationview alloc]init];
layout.scrolldirection = uicollectionviewscrolldirectionhorizontal;
layout.minimumlinespacing = pading;
layout.minimuminteritemspacing = pading;
// uicollectionviewflowlayout *layout = [[uicollectionviewflowlayout alloc]init];
// layout.scrolldirection = uicollectionviewscrolldirectionhorizontal;
_collectionview3 = [[uicollectionview alloc] initwithframe:cgrectmake(0, 100, [uiscreen mainscreen].bounds.size.width, imageheight * screen_rate) collectionviewlayout:layout];
_collectionview3.tag = 33;
_collectionview3.datasource = self;
_collectionview3.delegate = self;
_collectionview3.bounces = no;
_collectionview3.alwaysbouncehorizontal = no;
_collectionview3.alwaysbouncevertical = no;
_collectionview3.backgroundcolor = [uicolor graycolor];
_collectionview3.showshorizontalscrollindicator = no;
_collectionview3.showsverticalscrollindicator = no;
[self.view addsubview:_collectionview3];
[_collectionview3 registerclass:[collectionviewcell class] forcellwithreuseidentifier:collectionviewcell];
}
2、实现具体代理方法 uicollectionviewdelegate,uicollectionviewdatasource
- (nsinteger)collectionview:(uicollectionview *)collectionview numberofitemsinsection:(nsinteger)section{
return self.modelarray.count;
}
- (nsmutablearray *)modelarray {
if (!_modelarray) {
_modelarray = [nsmutablearray array];
}
return _modelarray;
}
- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath {
collmodel *infomodel = self.modelarray[indexpath.row];
nslog(@"section:%ld --- row:%ld -----%@",indexpath.section,indexpath.row,infomodel.title);
collectionviewcell * cell = [collectionview dequeuereusablecellwithreuseidentifier:collectionviewcell forindexpath:indexpath];
cell.itemmodel = infomodel;
return cell;
}
// 返回每个item的大小
- (cgsize)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout *)collectionviewlayout sizeforitematindexpath:(nsindexpath *)indexpath {
cgfloat cwidth = 80 * screen_rate;
cgfloat cheight = 80 * screen_rate;
return cgsizemake(cwidth, cheight);
}
#pragma mark - uicollectionviewdelegate点击事件
- (void)collectionview:(uicollectionview *)collectionview didselectitematindexpath:(nsindexpath *)indexpath{
collmodel *infomodel = self.modelarray[indexpath.row];
nslog(@"infomodelarray----%@",infomodel.title);
}
3、自定义uicollectionviewflowlayout
lhleftcollocationview.m 实现
#import "lhleftcollocationview.h"
@implementation lhleftcollocationview
- (cgpoint)targetcontentoffsetforproposedcontentoffset:(cgpoint)proposedcontentoffset withscrollingvelocity:(cgpoint)velocity {
cgrect targectrect = cgrectmake(proposedcontentoffset.x, 0.0, [uiscreen mainscreen].bounds.size.width, [uiscreen mainscreen].bounds.size.height);
nsarray * attriarray = [super layoutattributesforelementsinrect:targectrect];
cgfloat horizontalcenterx = proposedcontentoffset.x + ([uiscreen mainscreen].bounds.size.width);
cgfloat offsetadjustment = cgfloat_max;
for (uicollectionviewlayoutattributes * layoutattributes in attriarray) {
cgfloat itemhorizontalcenterx = layoutattributes.center.x;
if (fabs(itemhorizontalcenterx-horizontalcenterx) < fabs(offsetadjustment)) {
offsetadjustment = itemhorizontalcenterx - horizontalcenterx;
}
}
return cgpointmake(proposedcontentoffset.x , proposedcontentoffset.y);
}
cgfloat activedistance = 400; //垂直缩放除以系数
cgfloat scalefactor = 0.50; //缩放系数 越大缩放越大
- (nsarray<uicollectionviewlayoutattributes *> *)layoutattributesforelementsinrect:(cgrect)rect {
nsarray * array = [super layoutattributesforelementsinrect:rect];
cgrect visiblerect = cgrectzero;
visiblerect.origin = self.collectionview.contentoffset;
visiblerect.size = self.collectionview.bounds.size;
for (uicollectionviewlayoutattributes *attributes in array) {
cgfloat distance = cgrectgetmidx(visiblerect) - attributes.center.x;
cgfloat normalizeddistance = fabs(distance / activedistance);
cgfloat zoom = 1 - scalefactor * normalizeddistance;
nslog(@"zoom----%f",zoom);
attributes.transform3d = catransform3dmakescale(1.0, zoom, 1.0);
//底部显示效果
attributes.frame = cgrectmake(attributes.frame.origin.x, attributes.frame.origin.y + zoom, attributes.size.width, attributes.size.height);
//居中显示效果
// cgfloat scrolldirectionitemheight = self.itemsize.height;
// cgfloat sideitemfixedoffset = 0;
// sideitemfixedoffset = (scrolldirectionitemheight - scrolldirectionitemheight * 0.7) / 2;
// attributes.center = cgpointmake(attributes.center.x, attributes.center.y + zoom);
}
return array;
}
////设置放大动画
//-(nsarray<uicollectionviewlayoutattributes *> *)layoutattributesforelementsinrect:(cgrect)rect
//{
// nsarray *arr = [self getcopyofattributes:[super layoutattributesforelementsinrect:rect]];
// //屏幕中线
// cgfloat centerx = self.collectionview.contentoffset.x + self.collectionview.bounds.size.width/2.0f;
// //刷新cell缩放
// for (uicollectionviewlayoutattributes *attributes in arr) {
// cgfloat distance = fabs(attributes.center.x - centerx);
// //移动的距离和屏幕宽度的的比例
// cgfloat apartscale = distance/self.collectionview.bounds.size.width;
// //把卡片移动范围固定到 -π/4到 +π/4这一个范围内
// cgfloat scale = fabs(cos(apartscale * m_pi/4));
// //设置cell的缩放 按照余弦函数曲线 越居中越趋近于1
// attributes.transform = cgaffinetransformmakescale(1.0, scale);
// }
// return arr;
//}
//防止报错 先复制attributes
- (nsarray *)getcopyofattributes:(nsarray *)attributes
{
nsmutablearray *copyarr = [nsmutablearray new];
for (uicollectionviewlayoutattributes *attribute in attributes) {
[copyarr addobject:[attribute copy]];
}
return copyarr;
}
- (bool)shouldinvalidatelayoutforboundschange:(cgrect)newbounds {
return true;
}
@end
4、自定义cell 和model
model
#import <foundation/foundation.h> @interface collmodel : nsobject @property (nonatomic,strong)nsstring *imgurl; @property (nonatomic,strong)nsstring *title; @property (nonatomic,strong)nsstring *url; @end
cell 自定义
#import <uikit/uikit.h>
#import "collmodel.h"
@interface collectionviewcell : uicollectionviewcell
@property (nonatomic, strong) collmodel * itemmodel;
@end
#import "collectionviewcell.h"
#define screen_rate ([uiscreen mainscreen].bounds.size.width/375.0)
@interface collectionviewcell()
/**
* 存放所有下载操作的队列
*/
@property (nonatomic, strong) uiimageview *itemicon;
@property (nonatomic, strong) uilabel *itemlabel;
@property (nonatomic, strong) uilabel *pricelabel;
@end
@implementation collectionviewcell
@synthesize itemmodel = _itemmodel;
- (instancetype)initwithframe:(cgrect)frame
{
if (self = [super initwithframe:frame]) {
self.contentview.backgroundcolor = [uicolor clearcolor];
[self initview];
}
return self;
}
- (void)initview {
_itemicon = [[uiimageview alloc] init];
[self.contentview addsubview:_itemicon];
_itemicon.backgroundcolor = [uicolor clearcolor];
// cgfloat iconwidth = ([uiscreen mainscreen].bounds.size.width / 5.0) * screen_rate;
_itemicon.frame = cgrectmake(0, 0, self.contentview.frame.size.width, self.contentview.frame.size.height);
_itemicon.center = self.contentview.center;
}
- (collmodel *)itemmodel
{
return _itemmodel;
}
- (void)setitemmodel:(collmodel *)itemmodel
{
if (!itemmodel) {
return;
}
_itemmodel = itemmodel;
[self setcellwithmodel:_itemmodel];
}
- (void)setcellwithmodel:(collmodel *)itemmodel
{
[[nsoperationqueue mainqueue] addoperationwithblock:^{
_itemicon.image = [uiimage imagenamed:itemmodel.url];
}];
}
@end
运行效果
下载
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