这篇文章主要为大家详细介绍了ios uicollectionview实现横向滚动，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下
正文
ios uicollectionview实现横向滚动
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
效果
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、viviewcontroller.m 代码实现
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#import "viewcontroller.h"#import "collmodel.h"#define screen_width [uiscreen mainscreen].bounds.size.width#define screen_height [uiscreen mainscreen].bounds.size.height#define screen_rate ([uiscreen mainscreen].bounds.size.width/375.0)#import "imagecell.h"#import "lhhorizontalpageflowlayout.h"static nsstring * const imagec = @"imagecell";static nsstring * const moreimagec = @"imagecell";static const nsinteger kitemcountperrow = 5; //每行显示5个static const nsinteger krowcount = 3; //每页显示行数static float imageheight = 80;//cell 高度@interface viewcontroller ()<uicollectionviewdelegate,uicollectionviewdatasource>@property (nonatomic, strong) uicollectionview * collectionview;@property (nonatomic, strong) nsmutablearray * modelarray;@property (nonatomic, strong) uicollectionview * morecollectionview;@end@implementation viewcontroller- (void)viewdidload { [super viewdidload]; nsarray *apparray = [[self getdict] objectforkey:@"dictinfo"]; for (int i = 0; i < apparray.count; i++) { nsdictionary * appdic = apparray[i]; collmodel * model = [[collmodel alloc]init]; model.title = [appdic objectforkey:@"title"]; model.url = [appdic objectforkey:@"url"]; [self.modelarray addobject:model]; } [self createcollectionview]; [self createrightcollectionview];}- (nsdictionary *)getdict { nsstring * string = @"{\"dictinfo\":[{\"title\":\"你好啊\",\"url\":\"1.jpeg\"},{\"title\":\"你好啊\",\"url\":\"2.jpeg\"},{\"title\":\"你好啊\",\"url\":\"3.jpeg\"},{\"title\":\"你好啊\",\"url\":\"4.jpeg\"},{\"title\":\"你好啊\",\"url\":\"5.jpeg\"},{\"title\":\"你好啊\",\"url\":\"6.jpeg\"},{\"title\":\"是很好\",\"url\":\"7.jpeg\"},{\"title\":\"你好啊\",\"url\":\"1.jpeg\"},{\"title\":\"你好啊\",\"url\":\"2.jpeg\"},{\"title\":\"你好啊\",\"url\":\"3.jpeg\"},{\"title\":\"你好啊\",\"url\":\"4.jpeg\"},{\"title\":\"你好啊\",\"url\":\"5.jpeg\"},{\"title\":\"你好啊\",\"url\":\"6.jpeg\"},{\"title\":\"是很好\",\"url\":\"7.jpeg\"},{\"title\":\"你好啊\",\"url\":\"1.jpeg\"},{\"title\":\"你好啊\",\"url\":\"2.jpeg\"},{\"title\":\"你好啊\",\"url\":\"3.jpeg\"},{\"title\":\"你好啊\",\"url\":\"4.jpeg\"},{\"title\":\"你好啊\",\"url\":\"5.jpeg\"},{\"title\":\"你好啊\",\"url\":\"6.jpeg\"},{\"title\":\"是很好\",\"url\":\"7.jpeg\"}]}"; nsdictionary *infodic = [self dictionarywithjsonstring:string]; return infodic;}-(nsdictionary *)dictionarywithjsonstring:(nsstring *)jsonstring { if (jsonstring == nil) { return nil; } nsdata *jsondata = [jsonstring datausingencoding:nsutf8stringencoding]; nserror *err; nsdictionary *dic = [nsjsonserialization jsonobjectwithdata:jsondata options:nsjsonreadingmutablecontainers error:&err]; if(err) { nslog(@"json解析失败：%@",err); return nil; } return dic;}- (nsmutablearray *)modelarray { if (!_modelarray) { _modelarray = [nsmutablearray array]; } return _modelarray;}- (void)createcollectionview{ uicollectionviewflowlayout * layout = [[uicollectionviewflowlayout alloc]init]; layout.scrolldirection = uicollectionviewscrolldirectionhorizontal; layout.minimumlinespacing = 0; layout.minimuminteritemspacing = 0; _collectionview = [[uicollectionview alloc] initwithframe:cgrectmake(0, 100, [uiscreen mainscreen].bounds.size.width, imageheight * screen_rate) collectionviewlayout:layout]; _collectionview.tag = 11; _collectionview.backgroundcolor = [uicolor colorwithred:186 / 255.0 green:186 / 255.0 blue:186 / 255.0 alpha:0.9]; _collectionview.datasource = self; _collectionview.delegate = self; _collectionview.bounces = no; _collectionview.alwaysbouncehorizontal = yes; _collectionview.alwaysbouncevertical = no; _collectionview.showshorizontalscrollindicator = no; _collectionview.showsverticalscrollindicator = no; [self.view addsubview:_collectionview]; [_collectionview registerclass:[imagecell class] forcellwithreuseidentifier:imagec];}- (void)createrightcollectionview{ lhhorizontalpageflowlayout * layout = [[lhhorizontalpageflowlayout alloc] initwithrowcount:krowcount itemcountperrow:kitemcountperrow]; [layout setcolumnspacing:0 rowspacing:0 edgeinsets:uiedgeinsetsmake(0, 0, 0, 0)]; layout.scrolldirection = uicollectionviewscrolldirectionhorizontal; // uicollectionviewflowlayout *layout = [[uicollectionviewflowlayout alloc]init]; // layout.scrolldirection = uicollectionviewscrolldirectionhorizontal; layout.minimumlinespacing = 0; layout.minimuminteritemspacing = 0; _morecollectionview = [[uicollectionview alloc] initwithframe:cgrectmake(0, 300, [uiscreen mainscreen].bounds.size.width, imageheight * screen_rate * krowcount) collectionviewlayout:layout]; _morecollectionview.backgroundcolor = [uicolor clearcolor]; _morecollectionview.tag = 22; _morecollectionview.datasource = self; _morecollectionview.delegate = self; _morecollectionview.bounces = no; _morecollectionview.alwaysbouncehorizontal = yes; _morecollectionview.alwaysbouncevertical = no; _morecollectionview.backgroundcolor = [uicolor colorwithred:186 / 255.0 green:186 / 255.0 blue:186 / 255.0 alpha:0.9]; _morecollectionview.showshorizontalscrollindicator = no; _morecollectionview.showsverticalscrollindicator = no; [self.view addsubview:_morecollectionview]; [_morecollectionview registerclass:[imagecell class] forcellwithreuseidentifier:moreimagec];}- (nsinteger)collectionview:(uicollectionview *)collectionview numberofitemsinsection:(nsinteger)section{ return self.modelarray.count;}- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath { collmodel * model = self.modelarray[indexpath.row]; imagecell * cell = [collectionview dequeuereusablecellwithreuseidentifier:imagec forindexpath:indexpath]; cell.itemmodel = model; return cell;}// 返回每个item的大小- (cgsize)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout *)collectionviewlayout sizeforitematindexpath:(nsindexpath *)indexpath { cgfloat cwidth = imageheight * screen_rate; cgfloat cheight = imageheight * screen_rate; return cgsizemake(cwidth, cheight);}#pragma mark - uicollectionviewdelegate点击事件- (void)collectionview:(uicollectionview *)collectionview didselectitematindexpath:(nsindexpath *)indexpath{ collmodel * model = self.modelarray[indexpath.row]; nslog(@"self.appmodelarray----%@",model.title);}- (void)didreceivememorywarning { [super didreceivememorywarning]; // dispose of any resources that can be recreated.}@end |
2、自定义uicollectionviewflowlayout
lhhorizontalpageflowlayout.h 实现
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#import <uikit/uikit.h>@interface lhhorizontalpageflowlayout : uicollectionviewflowlayout/** 列间距 */@property (nonatomic, assign) cgfloat columnspacing;/** 行间距 */@property (nonatomic, assign) cgfloat rowspacing;/** collectionview的内边距 */@property (nonatomic, assign) uiedgeinsets edgeinsets;/** 多少行 */@property (nonatomic, assign) nsinteger rowcount;/** 每行展示多少个item */@property (nonatomic, assign) nsinteger itemcountperrow;//固定宽度@property (nonatomic, assign) cgfloat itemwidth; //设置完这个，就会自动计算列间距//固定高度@property (nonatomic, assign) cgfloat itemhight;//设置完这个，就会自动计算行间距/** 所有item的属性数组 */@property (nonatomic, strong) nsmutablearray *attributesarraym;/** 设置行列间距及collectionview的内边距 */- (void)setcolumnspacing:(cgfloat)columnspacing rowspacing:(cgfloat)rowspacing edgeinsets:(uiedgeinsets)edgeinsets;/** 设置多少行及每行展示的item个数 */- (void)setrowcount:(nsinteger)rowcount itemcountperrow:(nsinteger)itemcountperrow;#pragma mark - 构造方法/** 设置多少行及每行展示的item个数 */+ (instancetype)horizontalpageflowlayoutwithrowcount:(nsinteger)rowcount itemcountperrow:(nsinteger)itemcountperrow;/** 设置多少行及每行展示的item个数 */- (instancetype)initwithrowcount:(nsinteger)rowcount itemcountperrow:(nsinteger)itemcountperrow;@end |
lhhorizontalpageflowlayout.m 实现
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#import "lhhorizontalpageflowlayout.h"@implementation lhhorizontalpageflowlayout#pragma mark - public- (void)setcolumnspacing:(cgfloat)columnspacing rowspacing:(cgfloat)rowspacing edgeinsets:(uiedgeinsets)edgeinsets{ self.columnspacing = columnspacing; self.rowspacing = rowspacing; self.edgeinsets = edgeinsets;}- (void)setrowcount:(nsinteger)rowcount itemcountperrow:(nsinteger)itemcountperrow{ self.rowcount = rowcount; self.itemcountperrow = itemcountperrow;}#pragma mark - 构造方法+ (instancetype)horizontalpageflowlayoutwithrowcount:(nsinteger)rowcount itemcountperrow:(nsinteger)itemcountperrow{ return [[self alloc] initwithrowcount:rowcount itemcountperrow:itemcountperrow];}- (instancetype)initwithrowcount:(nsinteger)rowcount itemcountperrow:(nsinteger)itemcountperrow{ self = [super init]; if (self) { self.rowcount = rowcount; self.itemcountperrow = itemcountperrow; } return self;}#pragma mark - 重写父类方法- (instancetype)init{ self = [super init]; if (self) { [self setcolumnspacing:0 rowspacing:0 edgeinsets:uiedgeinsetszero]; } return self;}/** 布局前做一些准备工作 */- (void)preparelayout{ [super preparelayout]; if (self.attributesarraym && self.attributesarraym.count > 0) { [self.attributesarraym removeallobjects]; } // 从collectionview中获取到有多少个item nsinteger itemtotalcount = [self.collectionview numberofitemsinsection:0]; // 遍历出item的attributes,把它添加到管理它的属性数组中去 for (int i = 0; i < itemtotalcount; i++) { nsindexpath *indexpath = [nsindexpath indexpathforitem:i insection:0]; uicollectionviewlayoutattributes *attributes = [self layoutattributesforitematindexpath:indexpath]; [self.attributesarraym addobject:attributes]; }}/** 计算collectionview的滚动范围 */- (cgsize)collectionviewcontentsize{ // 计算出item的宽度 cgfloat itemwidth = (self.collectionview.frame.size.width - self.edgeinsets.left - self.itemcountperrow * self.columnspacing) / self.itemcountperrow; // 从collectionview中获取到有多少个item nsinteger itemtotalcount = [self.collectionview numberofitemsinsection:0]; // 理论上每页展示的item数目 nsinteger itemcount = self.rowcount * self.itemcountperrow; // 余数（用于确定最后一页展示的item个数） nsinteger remainder = itemtotalcount % itemcount; // 除数（用于判断页数） nsinteger pagenumber = itemtotalcount / itemcount; // 总个数小于self.rowcount * self.itemcountperrow if (itemtotalcount <= itemcount) { pagenumber = 1; }else { if (remainder == 0) { pagenumber = pagenumber; }else { // 余数不为0,除数加1 pagenumber = pagenumber + 1; } } cgfloat width = 0; // 考虑特殊情况(当item的总个数不是self.rowcount * self.itemcountperrow的整数倍,并且余数小于每行展示的个数的时候) if (pagenumber > 1 && remainder != 0 && remainder < self.itemcountperrow) { width = self.edgeinsets.left + (pagenumber - 1) * self.itemcountperrow * (itemwidth + self.columnspacing) + remainder * itemwidth + (remainder - 1)*self.columnspacing + self.edgeinsets.right; }else { width = self.edgeinsets.left + pagenumber * self.itemcountperrow * (itemwidth + self.columnspacing) - self.columnspacing + self.edgeinsets.right; } // 只支持水平方向上的滚动 return cgsizemake(width, 150);}/** 设置每个item的属性(主要是frame) */- (uicollectionviewlayoutattributes *)layoutattributesforitematindexpath:(nsindexpath *)indexpath{ // item的宽高由行列间距和collectionview的内边距决定 cgfloat itemwidth = (self.collectionview.frame.size.width) / self.itemcountperrow; cgfloat itemheight = (self.collectionview.frame.size.height) / self.rowcount; nsinteger item = indexpath.item; // 当前item所在的页 nsinteger pagenumber = item / (self.rowcount * self.itemcountperrow); nsinteger x = item % self.itemcountperrow + pagenumber * self.itemcountperrow; nsinteger y = item / self.itemcountperrow - pagenumber * self.rowcount; // 计算出item的坐标 cgfloat itemx = itemwidth * x; cgfloat itemy = itemheight * y; uicollectionviewlayoutattributes *attributes = [super layoutattributesforitematindexpath:indexpath]; // 每个item的frame attributes.frame = cgrectmake(itemx, itemy, itemwidth, itemheight); return attributes;}/** 返回collectionview视图中所有视图的属性数组 */- (nsarray<uicollectionviewlayoutattributes *> *)layoutattributesforelementsinrect:(cgrect)rect{ return self.attributesarraym;}#pragma mark - lazy- (nsmutablearray *)attributesarraym{ if (!_attributesarraym) { _attributesarraym = [nsmutablearray array]; } return _attributesarraym;}@end |
4、自定义cell 和model
model
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#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
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#import "imagecell.h"// 屏幕比例#define screen_rate ([uiscreen mainscreen].bounds.size.width/375.0)@interface imagecell()@property (nonatomic, strong) uiimageview *itemicon;@end@implementation imagecell@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 = 80 * screen_rate; _itemicon.frame = cgrectmake(0, 0, iconwidth, iconwidth); _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]; }];} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持米米素材网。
原文链接：https://blog.csdn.net/u013983033/article/details/83095126
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