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1、項目簡介

該項目應用UIScrollView的各類轉動事宜的監聽，仿制時間網選擇片子票的UI而開辟的一個自界說View。應用簡略，可擴大性很強。具有點擊每一個Item停止選票功效，選票居中功效，滑動時主動選擇間隔中央比來的View處於選中狀況，並且關於滑動時松開手的時刻能否有初始速度停止了辨別處置。案例演示以下：<br/>

仿時間網選票UI

2、項目講授

1、初始化UIScrollView中每一個Item的View，把每一個View放到_viewArray數組中，便利接上去的定位和治理。每個View中包括一個UIImageView，把每個UIImageView放在_imageViewArray數組中，便利接上去的停止跟著滑動的縮小和減少操作。

-(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、在滑動的進程中，我們及時的須要轉變盤算哪個Item間隔中央比來，在過渡到最中央的進程中，選中的Item間隔中央越近，選中Item的frame越年夜，反則越小。

-(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、點擊某一個Item，讓Item處於中央選中狀況。

-(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、當用戶在滑動停止，並具有初始速度的時刻，當滑動停滯的時刻，我們須要把間隔中央比來Item定位到最中央。

-(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、當用戶在滑動停止的時刻，然則沒有初始速度的時刻，此時不會觸發-(void)scrollViewDidEndDecelerating:(UIScrollView )scrollView辦法，我們須要在-(void)scrollViewDidEndDragging:(UIScrollView )scrollView willDecelerate:(BOOL)decelerate辦法中，停止處置。

-(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、留意點，設置_scrollview.decelerationRate = UIScrollViewDecelerationRateFast;減慢UIScrollView滑動速度。會應用戶體驗更好。

3、項目應用

1、本項目支撐CocosPod，援用工程代碼以下：

pod 'YXFilmSelectView', '~> 0.0.1'

2、應用辦法

YXFilmSelectView *filmSelectView = [[YXFilmSelectView alloc] initViewWithImageArray:imageArray];
filmSelectView.delegate = self;
[self.view addSubview:filmSelectView];

3、供給YXFilmSelectViewDelegate署理，用於每個Item處於選中狀況的處置。

- (void)itemSelected:(NSInteger)index{
_containerView.backgroundColor = _colorArray[index%_colorArray.count];
_showLabel.text = [NSString stringWithFormat:@"%zi",index];
}

4、Demo下載地址

Demo下載地址

以上就是IOS 仿時間網選票UI實例，有須要的同伙可以參考下，感謝年夜家對本站的支撐！

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