iOS UICollectionView实现横向滑动

本文实例为大家分享了ios uicollectionview实现横向滑动的具体代码，供大家参考，具体内容如下

uicollectionview的横向滚动，目前我使用在了显示输入框的输入历史上；

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//

// scvisitorinputaccessoryview.m

// 访客通行录入页面--访客姓名输入历史的inputaccessory

#import "scinputaccessoryview.h"

#import "scinputaccessorycell.h"

#define schorizontalmargin 15.0f

#define scverticalmargin 10.0f

@interface scinputaccessoryview () <uicollectionviewdelegate, uicollectionviewdatasource,uicollectionviewdelegateflowlayout>

@property (weak, nonatomic) iboutlet uicollectionview *collectionview;

/// 名字记录的数组

@property (nonatomic, strong) nsmutablearray *namearray;

@end

@implementation scinputaccessoryview

+ (instancetype)loadnibview {

return [[[nsbundle mainbundle] loadnibnamed:[scinputaccessoryview classname] owner:self options:nil] objectatindex:0];

}

- (void)awakefromnib {

[super awakefromnib];

self.clipstobounds = yes;

self.collectionview.delegate = self;

self.collectionview.datasource = self;

[self setupview];

}

- (void)setupview {

/// 设置此属性为yes 不满一屏幕也能滚动

self.collectionview.alwaysbouncehorizontal = yes;

self.collectionview.showshorizontalscrollindicator = no;

// 1.创建流水布局

uicollectionviewflowlayout *layout = [[uicollectionviewflowlayout alloc] init];

layout.scrolldirection = uicollectionviewscrolldirectionhorizontal;

self.collectionview.collectionviewlayout = layout;

[self registernibwithtableview];

}

#pragma mark - 代理方法 delegate methods

// 设置分区

- (nsinteger)numberofsectionsincollectionview:(uicollectionview *)collectionview {

return 1;

}

// 每个分区上得元素个数

- (nsinteger)collectionview:(uicollectionview *)collectionview numberofitemsinsection:(nsinteger)section {

return self.namearray.count;

}

// 设置cell

- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath {

scinputaccessorycell *cell = [collectionview dequeuereusablecellwithreuseidentifier:nsstringfromclass([scinputaccessorycell

class]) forindexpath:indexpath];

[cell refreshcellwithtitle:self.namearray[indexpath.row]];

return cell;

}

// 设置cell大小 itemsize：可以给每一个cell指定不同的尺寸

- (cgsize)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout*)collectionviewlayout sizeforitematindexpath:(nsindexpath *)indexpath {

cgfloat height = 35.0f;

cgfloat width = [self gainstringwidthwithstring:self.namearray[indexpath.row] font:15.0f height:height];

return cgsizemake(width, height);

}

// 设置uicollectionview整体的内边距（这样item不贴边显示）

- (uiedgeinsets)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout *)collectionviewlayout insetforsectionatindex:(nsinteger)section {

// 上左下右

return uiedgeinsetsmake(scverticalmargin, schorizontalmargin, scverticalmargin, schorizontalmargin);

}

// 设置minimumlinespacing：cell上下之间最小的距离

- (cgfloat)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout *)collectionviewlayout minimumlinespacingforsectionatindex:(nsinteger)section {

return schorizontalmargin;

}

// 设置minimuminteritemspacing：cell左右之间最小的距离

- (cgfloat)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout *)collectionviewlayout minimuminteritemspacingforsectionatindex:(nsinteger)section {

return schorizontalmargin;

}

// 选中cell的回调

- (void)collectionview:(uicollectionview *)collectionview didselectitematindexpath:(nsindexpath *)indexpath {

if (self.selectrowblock) {

self.selectrowblock(indexpath.row, self.namearray[indexpath.row]);

}

#pragma mark - 对外方法 public methods

/// array数组里面放的元素必须字符串类型的

- (void)refreshuiwithnamearray:(nsarray<nsstring *> *)array {

[self.namearray removeallobjects];

[self.namearray addobjectsfromarray:array];

[self.collectionview reloaddata];

}

#pragma mark - 内部方法 private methods

// 注册cell

- (void)registernibwithtableview {

[self.collectionview registernib:[uinib nibwithnibname:[scinputaccessorycell classname] bundle:nil] forcellwithreuseidentifier:nsstringfromclass([scinputaccessorycell

class])];

}

- (cgfloat)gainstringwidthwithstring:(nsstring *)string font:(cgfloat)font height:(cgfloat)height {

if (string.length == 0) {

return 0.0f;

}

cgsize maxsize = cgsizemake(maxfloat, height);

cgsize realsize = [string boundingrectwithsize:maxsize

options:nsstringdrawinguseslinefragmentorigin | nsstringdrawingusesfontleading

attributes:@{nsfontattributename:[uifont systemfontofsize:font]}

context:nil].size;

/// 左右各16