iOS利用余弦函數(shù)實(shí)現(xiàn)卡片瀏覽工具

第iOS利用余弦函數(shù)實(shí)現(xiàn)卡片瀏覽工具_(dá)scrollView=[[UIScrollViewalloc]initWithFrame:self.bounds];

_scrollView.delegate=self;

_scrollView.showsHorizontalScrollIndicator=false;

[selfaddSubview:_scrollView];

//初始化其他參數(shù)

_cards=[[NSMutableArrayalloc]init];

_currentIndex=0;

#pragmamark-

#pragmamark視圖Frame配置

//卡片寬度

-(float)cardWidth

returnviewScale*self.bounds.size.width;

//卡片間隔

-(float)margin

return(self.bounds.size.width-[selfcardWidth])/4;

//卡片起始位置

-(float)startX

return(self.bounds.size.width-[selfcardWidth])/2.0f;

#pragmamark-

#pragmamark配置輪播圖片

-(void)setCardNumber:(NSInteger)cardNumber

_cardNumber=cardNumber;

//初始化各個(gè)播放器位置

for(NSIntegeri=0;icardNumber;i++){

//第一步在ScrollView上添加卡片

floatviewX=[selfstartX]+i*([selfcardWidth]+[selfmargin]);

Card*card=[[Cardalloc]initWithFrame:CGRectMake(viewX,0,[selfcardWidth],self.bounds.size.height)];

card.layer.borderWidth=1.0f;

card.index=i;

[_scrollViewaddSubview:card];

[_cardsaddObject:card];

[_scrollViewsetContentSize:CGSizeMake(card.frame.origin.x+[selfcardWidth]+2*[selfmargin],0)];

//更新卡片的大小

[selfupdateCardTransform];

#pragmamark-

#pragmamarkScrollView代理方法

//開始拖動(dòng)時(shí)保存起始位置

-(void)scrollViewWillBeginDragging:(UIScrollView*)scrollView

_startPointX=scrollView.contentOffset.x;

//當(dāng)ScrollView拖動(dòng)時(shí)變換每個(gè)view的大小，并保證居中屏幕的view高度最高

-(void)scrollViewDidScroll:(UIScrollView*)scrollView

[selfupdateCardTransform];

//滾動(dòng)結(jié)束，自動(dòng)回彈到居中卡片

-(void)scrollViewDidEndDragging:(UIScrollView*)scrollViewwillDecelerate:(BOOL)decelerate

//滾動(dòng)到視圖中間位置

dispatch_async(dispatch_get_main_queue(),^{

[selfscrollToCurrentCard];

//卡片自動(dòng)居中

-(void)scrollToCurrentCard

_endPointX=_scrollView.contentOffset.x;

//設(shè)置滾動(dòng)最小生效范圍，滾動(dòng)超過scrollMiniDistance即視為有切換卡片的意向

floatscrollMiniDistance=self.bounds.size.width/30.0f;

if(_startPointX-_endPointXscrollMiniDistance){

NSLog(@向右滑動(dòng)屏幕

if(_currentIndex!=0){

_currentIndex-=1;

}elseif(_endPointX-_startPointXscrollMiniDistance)

NSLog(@向左滑動(dòng)屏幕

if(_currentIndex!=_cards.count-1){

_currentIndex+=1;

floatviewX=[selfstartX]+_currentIndex*([selfcardWidth]+[selfmar