前言
图片浏览器大家应该都用过，这方面的第三方也有很多，不过有时候第三方会跟我们的需求有一些出入，这就需要我们要么对第三方进行修改要么自己重新定制。我是比较喜欢自己重新定制的，在这给大家简单介绍一下我定制的图片浏览器，算是给大家提供一个思路，可以在此基础上进行修改完善。
实现原理
通过弹出uiviewcontroller的形式来展示图片，使用uicollectionview并添加手势来实现图片浏览时图片的间隔。
首先创建一个继承于uiviewcontroller的控制器，来作为图片浏览器的控制器，并实现相应的代码如下：
示例代码
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#import <uikit/uikit.h>
#import "rhphotobrowser.h"
@interface rhphotobrowsercontroller : uiviewcontroller
- (instancetype)initwithtype:(rhphotosourcetype)type imagearr:(nsarray *)imagearr selectindex:(nsinteger)selectindex;
@end
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#import "rhphotobrowsercontroller.h"
#import "rhphotobrowsercell.h"
#define cell_photobrowser @"cell_photobrowser"
#define photospace 10 // 图片间距
@interface rhphotobrowsercontroller () <uicollectionviewdatasource, uicollectionviewdelegate, uicollectionviewdelegateflowlayout>
@property (nonatomic, strong) uicollectionview * collection;
@property (nonatomic, strong) uipagecontrol * pagecontrol;
@property (nonatomic, strong) nsmutablearray * dataarr;
@property (nonatomic, assign) rhphotosourcetype type;
@property (nonatomic, assign) nsinteger selectindex;
@property (nonatomic, assign) cgfloat pancenterx;
@property (nonatomic, assign) cgfloat startoffsetx;
@property (nonatomic, assign) cgfloat offsetx;
@property (nonatomic, assign) cgfloat panx;
@end
@implementation rhphotobrowsercontroller
- (instancetype)initwithtype:(rhphotosourcetype)type imagearr:(nsarray *)imagearr selectindex:(nsinteger)selectindex {
self = [super init];
if (self) {
[self.dataarr removeallobjects];
[self.dataarr addobjectsfromarray:imagearr];
_type = type;
_selectindex = selectindex;
}
return self;
}
- (void)viewdidload {
[super viewdidload];
// do any additional setup after loading the view.
[self addsubviews];
[self makeconstraintsforui];
}
#pragma mark - add subviews
- (void)addsubviews {
self.view.backgroundcolor = [uicolor blackcolor];
[self.view addsubview:self.collection];
[self.view addsubview:self.pagecontrol];
}
- (void)makeconstraintsforui {
[_collection mas_makeconstraints:^(masconstraintmaker *make) {
make.top.left.right.bottom.mas_equalto(0);
}];
[_pagecontrol mas_makeconstraints:^(masconstraintmaker *make) {
make.left.right.mas_equalto(0);
make.bottom.mas_equalto(-ss(50));
make.height.mas_equalto(20);
}];
[self performselector:@selector(setcollectioncontentoffset) withobject:nil afterdelay:0.1];
}
- (void)setcollectioncontentoffset {
rhweakself;
dispatch_async(dispatch_get_main_queue(), ^{
[weakself.collection setcontentoffset:cgpointmake((screen_width + photospace) * _selectindex, 0) animated:no];
weakself.pagecontrol.numberofpages = weakself.dataarr.count;
weakself.pagecontrol.currentpage = _selectindex;
});
_startoffsetx = _collection.contentoffset.x;
}
#pragma mark - gesturerecognizer event
- (void)pancollection:(uipangesturerecognizer *)pan {
_pancenterx = [pan translationinview:self.collection].x;
if (pan.state == uigesturerecognizerstatebegan) {
_startoffsetx = _collection.contentoffset.x;
_offsetx = 0;
_panx = 0;
}
if (_selectindex == 0) {
if (_pancenterx > 0) {
cgfloat s = (screen_width - _pancenterx) / screen_width;
_offsetx += (_pancenterx - _panx) * s;
_panx = _pancenterx;
[self.collection setcontentoffset:cgpointmake(-_offsetx, 0) animated:no];
} else {
if (self.dataarr.count == 1) {
cgfloat s = (screen_width + _pancenterx) / screen_width;
_offsetx += (_pancenterx - _panx) * s;
_panx = _pancenterx;
[self.collection setcontentoffset:cgpointmake(-_offsetx, 0) animated:no];
} else {
[self.collection setcontentoffset:cgpointmake(_startoffsetx - _pancenterx, 0) animated:no];
}
}
} else if (_selectindex == self.dataarr.count - 1) {
if (_pancenterx < 0) {
cgfloat s = (screen_width + _pancenterx) / screen_width;
_offsetx += (_pancenterx - _panx) * s;
_panx = _pancenterx;
[self.collection setcontentoffset:cgpointmake(_startoffsetx - _offsetx, 0) animated:no];
} else {
[self.collection setcontentoffset:cgpointmake(_startoffsetx - _pancenterx, 0) animated:no];
}
} else {
[self.collection setcontentoffset:cgpointmake(_startoffsetx - _pancenterx, 0) animated:no];
}
if (pan.state == uigesturerecognizerstateended) {
if ([self absolutevalue:_pancenterx] > screen_width/3) {
if (_pancenterx < 0) {
_selectindex += 1;
} else {
_selectindex -= 1;
}
if (_selectindex == self.dataarr.count) {
_selectindex = self.dataarr.count - 1;
} else if (_selectindex == -1) {
_selectindex = 0;
}
[self.collection setcontentoffset:cgpointmake((screen_width + photospace) * _selectindex, 0) animated:yes];
self.pagecontrol.currentpage = _selectindex;
} else {
[self.collection setcontentoffset:cgpointmake(_startoffsetx, 0) animated:yes];
}
}
}
- (void)swipecollection:(uiswipegesturerecognizer *)swipe {
if (swipe.direction == uiswipegesturerecognizerdirectionleft) {
_selectindex += 1;
} else if (swipe.direction == uiswipegesturerecognizerdirectionright) {
_selectindex -= 1;
}
if (_selectindex == self.dataarr.count) {
_selectindex = self.dataarr.count - 1;
} else if (_selectindex == -1) {
_selectindex = 0;
}
self.pagecontrol.currentpage = _selectindex;
[self.collection setcontentoffset:cgpointmake((screen_width + photospace) * _selectindex, 0) animated:yes];
}
// 返回value的绝对值
- (cgfloat)absolutevalue:(cgfloat)value {
if (value < 0) {
return -value;
}
return value;
}
#pragma mark - collection delegate
- (nsinteger)collectionview:(uicollectionview *)collectionview numberofitemsinsection:(nsinteger)section {
return self.dataarr.count;
}
- (uicollectionviewcell *)collectionview:(uicollectionview *)collectionview cellforitematindexpath:(nsindexpath *)indexpath {
rhphotobrowsercell * cell = [collectionview dequeuereusablecellwithreuseidentifier:cell_photobrowser forindexpath:indexpath];
if (indexpath.row < self.dataarr.count) {
if (_type == rhphotosourcetypeimage) {
uiimage * image = [self.dataarr objectatindex:indexpath.row];
[cell configcellwithimage:image];
} else if (_type == rhphotosourcetypeurl) {
nsstring * url = [self.dataarr objectatindex:indexpath.row];
[cell configcellwithurl:url];
} else if (_type == rhphotosourcetypefilepath) {
nsstring * filepath = [self.dataarr objectatindex:indexpath.row];
[cell configcellwithfilepath:filepath];
} else if (_type == rhphotosourcetypefilename) {
nsstring * filename = [self.dataarr objectatindex:indexpath.row];
[cell configcellwithfilename:filename];
}
}
return cell;
}
- (cgsize)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout *)collectionviewlayout sizeforitematindexpath:(nsindexpath *)indexpath {
return cgsizemake(screen_width, screen_height);
}
- (cgfloat)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout *)collectionviewlayout minimumlinespacingforsectionatindex:(nsinteger)section {
return photospace;
}
- (cgfloat)collectionview:(uicollectionview *)collectionview layout:(uicollectionviewlayout *)collectionviewlayout minimuminteritemspacingforsectionatindex:(nsinteger)section {
return 0;
}
- (void)collectionview:(uicollectionview *)collectionview didselectitematindexpath:(nsindexpath *)indexpath {
[self dismissviewcontrolleranimated:yes completion:nil];
}
#pragma mark - setter and getter
- (uicollectionview *)collection {
if (!_collection) {
uicollectionviewflowlayout * layout = [[uicollectionviewflowlayout alloc] init];
layout.scrolldirection = uicollectionviewscrolldirectionhorizontal;
uicollectionview * cv = [[uicollectionview alloc] initwithframe:cgrectzero collectionviewlayout:layout];
cv.backgroundcolor = [uicolor blackcolor];
cv.delegate = self;
cv.datasource = self;
cv.showshorizontalscrollindicator = no;
[cv registerclass:[rhphotobrowsercell class] forcellwithreuseidentifier:cell_photobrowser];
uipangesturerecognizer * pan = [[uipangesturerecognizer alloc] initwithtarget:self action:@selector(pancollection:)];
[cv addgesturerecognizer:pan];
uiswipegesturerecognizer * swipel = [[uiswipegesturerecognizer alloc] initwithtarget:self action:@selector(swipecollection:)];
swipel.direction = uiswipegesturerecognizerdirectionleft;
[cv addgesturerecognizer:swipel];
uiswipegesturerecognizer * swiper = [[uiswipegesturerecognizer alloc] initwithtarget:self action:@selector(swipecollection:)];
swiper.direction = uiswipegesturerecognizerdirectionright;
[cv addgesturerecognizer:swiper];
_collection = cv;
}
return _collection;
}
- (uipagecontrol *)pagecontrol {
if (!_pagecontrol) {
uipagecontrol * pagecontrol = [[uipagecontrol alloc] init];
pagecontrol.pageindicatortintcolor = [[uicolor lightgraycolor] colorwithalphacomponent:0.9];
pagecontrol.currentpageindicatortintcolor = [uicolor whitecolor];
pagecontrol.userinteractionenabled = no;
_pagecontrol = pagecontrol;
}
return _pagecontrol;
}
- (nsmutablearray *)dataarr {
if (!_dataarr) {
_dataarr = [nsmutablearray array];
}
return _dataarr;
}
@end
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其实到此基本已经结束了，大家实现一个相对应的cell就可以了。使用时直接通过外漏的方法创建该控制器对象并弹出该控制器即可。
为了更加方便的调用，我又增加了一个nsobject的类来控制以上控制器的调用。如下：
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#import <foundation/foundation.h>
typedef ns_enum(nsuinteger, rhphotosourcetype) {
rhphotosourcetypeimage = 0,
rhphotosourcetypeurl = 1,
rhphotosourcetypefilepath = 2,
rhphotosourcetypefilename = 3
};
@interface rhphotobrowser : nsobject
+ (rhphotobrowser *)shared;
- (void)browseimagewithtype:(rhphotosourcetype)type imagearr:(nsarray *)imagearr selectindex:(nsinteger)selectindex;
@end
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#import "rhphotobrowser.h"
#import "rhphotobrowsercontroller.h"
@implementation rhphotobrowser
+ (rhphotobrowser *)shared {
static rhphotobrowser * helper = nil;
static dispatch_once_t oncetoken;
dispatch_once(&oncetoken, ^{
helper = [[rhphotobrowser alloc] init];
});
return helper;
}
- (void)browseimagewithtype:(rhphotosourcetype)type imagearr:(nsarray *)imagearr selectindex:(nsinteger)selectindex {
if (selectindex > imagearr.count - 1) {
selectindex = 0;
}
uiviewcontroller * rootvc = [uiapplication sharedapplication].delegate.window.rootviewcontroller;
rhphotobrowsercontroller * browser = [[rhphotobrowsercontroller alloc] initwithtype:type imagearr:imagearr selectindex:selectindex];
[rootvc presentviewcontroller:browser animated:yes completion:nil];
}
@end
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这样使用的时候只需要使用该类就可以了。这里大家可以将单例去掉，将对象方法直接改为类方法即可。我是习惯了，所以这样写了。
再给大家看一下使用方法一步调用：
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[[rhphotobrowser shared] browseimagewithtype:rhphotosourcetypefilename imagearr:@[@"c006", @"c007", @"c008", @"c009", @"c010"] selectindex:2];
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效果如下：
最后，还是希望能够帮助到有需要的朋友们，愿我们能够一起学习进步，在开发的道路上越走越顺利！！！
总结
以上就是这篇文章的全部内容了，希望本文的内容对大家的学习或者工作具有一定的参考学习价值，如果有疑问大家可以留言交流，谢谢大家对快网idc的支持。
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