贡品仙姬,祝义方,妾家住横塘
一、项目简介
该项目利用uiscrollview的各种滚动事件的监听，仿造时光网选择电影票的ui而开发的一个自定义view。使用简单，可扩展性很强。具备点击每个item进行选票功能，选票居中功能，滑动时自动选择距离中间最近的view处于选中状态，而且对于滑动时松开手的时候是否有初始速度进行了区分处理。案例演示如下：<br/>
仿时光网选票ui
二、项目讲解
1、初始化uiscrollview中每个item的view，把每个view放到_viewarray数组中，方便接下来的定位和管理。每一个view中包含一个uiimageview，把每一个uiimageview放在_imageviewarray数组中，方便接下来的进行随着滑动的放大和缩小操作。
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-(instancetype)initviewwithimagearray:(nsarray *)imagearray{
if (!imagearray) {
return nil;
}
if (imagearray.count<1) {
return nil;
}
nsinteger totalnum = imagearray.count;
self = [super initwithframe:cgrectmake(0, 40, screen_width, 120)];
if (self) {
_scrollview = [[uiscrollview alloc] initwithframe:self.bounds];
_scrollview.contentsize = cgsizemake(left_space*2+select_view_width+(totalnum-1)*normal_view_width+(totalnum-1)*item_space, 120);
_scrollview.delegate = self;
_scrollview.showshorizontalscrollindicator = no;
_scrollview.decelerationrate = uiscrollviewdecelerationratefast;
[self addsubview:_scrollview];
uiview *backview = [[uiview alloc] initwithframe:cgrectmake(-screen_width, 0, _scrollview.contentsize.width+screen_width*2, _scrollview.contentsize.height-20)];
backview.backgroundcolor = [uicolor lightgraycolor];
[_scrollview addsubview:backview];
_imageviewarray = [nsmutablearray array];
_viewarray = [nsmutablearray array];
cgfloat offsetx = left_space;
for (int i=0; i<totalnum; i++) {
uiview *view = [[uiview alloc] initwithframe:cgrectmake(offsetx, 0, normal_view_width, normal_view_height)];
[_scrollview addsubview:view];
[_viewarray addobject:view];
offsetx += normal_view_width+item_space;
cgrect rect;
if (i==0) {
rect = cgrectmake(-(select_view_width-normal_view_width)/2, 0, select_view_width, select_view_height);
}else{
rect = cgrectmake(0, 0, normal_view_width, normal_view_height);
}
uiimageview *imageview = [[uiimageview alloc] initwithframe:rect];
imageview.image = imagearray[i];
imageview.tag = i;
imageview.userinteractionenabled = yes;
uitapgesturerecognizer *tap = [[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(clickimage:)];
[imageview addgesturerecognizer:tap];
[view addsubview:imageview];
[_imageviewarray addobject:imageview];
}
}
return self;
}
2、在滑动的过程中，我们实时的需要改变计算哪一个item距离中间最近，在过渡到最中间的过程中，选中的item距离中间越近，选中item的frame越大，反则越小。
-(void)scrollviewdidscroll:(uiscrollview *)scrollview{
int currentindex = scrollview.contentoffset.x/(normal_view_width+item_space);
if (currentindex>_imageviewarray.count-2||currentindex<0) {
return;
}
int rightindex = currentindex+1;
uiimageview *currentimageview = _imageviewarray[currentindex];
uiimageview *rightimageview = _imageviewarray[rightindex];
cgfloat scale = (scrollview.contentoffset.x-currentindex*(normal_view_width+item_space))/(normal_view_width+item_space);
//nslog(@"%f",scale);
cgfloat width = select_view_width-scale*(select_view_width-normal_view_width);
cgfloat height = select_view_height-scale*(select_view_height-normal_view_height);
if (width<normal_view_width) {
width = normal_view_width;
}
if (height<normal_view_height) {
height = normal_view_height;
}
if (width>select_view_width) {
width = select_view_width;
}
if (height>select_view_height) {
height = select_view_height;
}
cgrect rect = cgrectmake(-(width-normal_view_width)/2, 0, width, height);
currentimageview.frame = rect;
width = normal_view_width+scale*(select_view_width-normal_view_width);
height = normal_view_height+scale*(select_view_height-normal_view_height);
if (width<normal_view_width) {
width = normal_view_width;
}
if (height<normal_view_height) {
height = normal_view_height;
}
if (width>select_view_width) {
width = select_view_width;
}
if (height>select_view_height) {
height = select_view_height;
}
rect = cgrectmake(-(width-normal_view_width)/2, 0, width, height);
nslog(@"%@",nsstringfromcgrect(rect));
rightimageview.frame = rect;
}
3、点击某一个item，让item处于中间选中状态。
-(void)clickimage:(uitapgesturerecognizer *)tap{
uiimageview *imageview = (uiimageview *)tap.view;
nsinteger tag = imageview.tag;
uiview *containerview = _viewarray[tag];
cgfloat offsetx = cgrectgetmidx(containerview.frame)-screen_width/2;
[_scrollview scrollrecttovisible:cgrectmake(offsetx, 0, screen_width, 120) animated:yes];
if (_delegate && [_delegate respondstoselector:@selector(itemselected:)]) {
[_delegate itemselected:tag];
}
}
4、当用户在滑动结束，并具有初始速度的时候，当滑动停止的时候，我们需要把距离中间最近item定位到最中间。
-(void)scrollviewdidenddecelerating:(uiscrollview *)scrollview{
int currentindex = roundf(scrollview.contentoffset.x/(normal_view_width+item_space));
uiview *containerview = _viewarray[currentindex];
cgfloat offsetx = cgrectgetmidx(containerview.frame)-screen_width/2;
[_scrollview scrollrecttovisible:cgrectmake(offsetx, 0, screen_width, 120) animated:yes];
if (_delegate && [_delegate respondstoselector:@selector(itemselected:)]) {
[_delegate itemselected:currentindex];
}
}
5、当用户在滑动结束的时候，但是没有初始速度的时候，此时不会触发-(void)scrollviewdidenddecelerating:(uiscrollview )scrollview方法，我们需要在-(void)scrollviewdidenddragging:(uiscrollview )scrollview willdecelerate:(bool)decelerate方法中，进行处理。
-(void)scrollviewdidenddragging:(uiscrollview *)scrollview willdecelerate:(bool)decelerate{
if (!decelerate) {
int currentindex = roundf(scrollview.contentoffset.x/(normal_view_width+item_space));
uiview *containerview = _viewarray[currentindex];
cgfloat offsetx = cgrectgetmidx(containerview.frame)-screen_width/2;
[_scrollview scrollrecttovisible:cgrectmake(offsetx, 0, screen_width, 120) animated:yes];
if (_delegate && [_delegate respondstoselector:@selector(itemselected:)]) {
[_delegate itemselected:currentindex];
}
}
}
6、注意点，设置_scrollview.decelerationrate = uiscrollviewdecelerationratefast;减慢uiscrollview滑动速度。会使用户体验更好。
三、项目使用
1、本项目支持cocospod，引用工程代码如下：
pod 'yxfilmselectview', '~> 0.0.1'
2、使用方法
yxfilmselectview *filmselectview = [[yxfilmselectview alloc] initviewwithimagearray:imagearray]; filmselectview.delegate = self; [self.view addsubview:filmselectview];
3、提供yxfilmselectviewdelegate代理，用于每一个item处于选中状态的处理。
- (void)itemselected:(nsinteger)index{
_containerview.backgroundcolor = _colorarray[index%_colorarray.count];
_showlabel.text = [nsstring stringwithformat:@"%zi",index];
}
四、demo下载地址
以上就是ios 仿时光网选票ui实例，有需要的朋友可以参考下，谢谢大家对本站的支持！
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