本文实例为大家分享了ios实现卡片式滚动效果的具体代码，供大家参考，具体内容如下
先来张效果图吧：
直接上源码了：
cardscrollview.h
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#import <uikit/uikit.h> @interface cardview : uiview @property (nonatomic, assign) cgfloat zoomrate; @property (nonatomic, strong) nsstring *imgurl; - (uiimage *)getimage; @end @interface cardscrollview : uiview @property (nonatomic, assign) cgfloat cardviewwidth;@property (nonatomic, assign) cgfloat mincardzoomrate;@property (nonatomic, assign) cgfloat maxcardzoomrate; @property (nonatomic, assign) bool needbackgroundblurimage; - (void)setimgurls:(nsarray<nsstring *> *)imgurls selectedcard:(void(^)(nsinteger selectedindex))selectedcard; @end |
cardscrollview.m
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#import "cardscrollview.h" @interface cardview () @property (nonatomic, strong) uiimageview *imgview; @end @implementation cardview - (instancetype)initwithframe:(cgrect)frame { if (self = [super initwithframe:frame]) { _imgview = [[uiimageview alloc] initwithframe:cgrectmake(0, 0, cgrectgetwidth(frame), cgrectgetheight(frame))]; [_imgview setcontentmode:uiviewcontentmodescaleaspectfit]; [_imgview setclipstobounds:yes]; [self addsubview:_imgview]; } return self;} - (void)setzoomrate:(cgfloat)zoomrate { if (zoomrate < 0) { zoomrate = 0; } _zoomrate = zoomrate; cgfloat width = cgrectgetwidth(self.bounds); cgfloat height = cgrectgetheight(self.bounds); cgfloat imgviewwidth = width * zoomrate; cgfloat imgviewheight = height * zoomrate; _imgview.frame = cgrectmake((width - imgviewwidth) / 2, (height - imgviewheight) / 2, imgviewwidth, imgviewheight);} - (void)setimgurl:(nsstring *)imgurl { _imgurl = imgurl; [_imgview setimage:[uiimage imagenamed:imgurl]];} - (uiimage *)getimage { return [_imgview image];} @end @interface cardscrollview () <uiscrollviewdelegate> @property (nonatomic, strong) uiimageview *bgimageview;@property (nonatomic, strong) uivisualeffectview *blurview; @property (nonatomic, strong) uiscrollview *scrollview;@property (nonatomic, assign) cgfloat aroundspacing;@property (nonatomic, strong) nsarray<nsstring *> *imgurls;@property (nonatomic, strong) nsmutablearray<cardview *> *cardviewarray;@property (nonatomic, assign) nsinteger currentindex; @property (nonatomic, strong) void(^selectedcard)(nsinteger); @end @implementation cardscrollview - (uiimageview *)bgimageview { if (!_bgimageview) { _bgimageview = [[uiimageview alloc] initwithframe:self.bounds]; } return _bgimageview;} - (uivisualeffectview *)blurview { if (!_blurview) { [self addsubview:self.bgimageview]; _blurview = [[uivisualeffectview alloc] initwithframe:self.bounds]; [_blurview seteffect:[uiblureffect effectwithstyle:uiblureffectstylelight]]; } return _blurview;} - (uiscrollview *)scrollview { if (!_scrollview) { _scrollview = [[uiscrollview alloc] initwithframe:self.bounds]; _scrollview.delegate = self; [_scrollview setshowshorizontalscrollindicator:no]; } return _scrollview;} - (nsmutablearray<cardview *> *)cardviewarray { if (!_cardviewarray) { _cardviewarray = [nsmutablearray array]; } return _cardviewarray;} - (void)layoutsubviews { [super layoutsubviews]; if (_needbackgroundblurimage) { [self addsubview:self.blurview]; } [self addsubview:self.scrollview];} - (void)setimgurls:(nsarray<nsstring *> *)imgurls selectedcard:(void (^)(nsinteger))selectedcard { _imgurls = imgurls; _selectedcard = selectedcard; [self layoutcardviews];} - (void)layoutcardviews { if (_cardviewwidth == 0) { _cardviewwidth = cgrectgetwidth(self.bounds) / 2; } if (_mincardzoomrate == 0) { _mincardzoomrate = 0.5; } if (_maxcardzoomrate == 0) { _maxcardzoomrate = 1; } _aroundspacing = (cgrectgetwidth(self.bounds) - _cardviewwidth) / 2; for (int i = 0; i < [_imgurls count]; i++) { cardview *cardview = [[cardview alloc] initwithframe:cgrectmake(_aroundspacing + i * (_cardviewwidth), 0, _cardviewwidth, cgrectgetheight(self.bounds))]; cardview.zoomrate = _mincardzoomrate; cardview.imgurl = _imgurls[i]; cardview.tag = i; uitapgesturerecognizer *tapgr = [[uitapgesturerecognizer alloc] initwithtarget:self action:@selector(clickcardview:)]; [cardview addgesturerecognizer:tapgr]; [_scrollview addsubview:cardview]; [self.cardviewarray addobject:cardview]; } [_scrollview setcontentsize:cgsizemake(cgrectgetmaxx([_cardviewarray lastobject].frame) + _aroundspacing, 0)]; [self setcardviewzoomrate:[_cardviewarray firstobject]]; [self selectindex:0];} - (void)clickcardview:(uigesturerecognizer *)gesturecognizer { [self selectindex:gesturecognizer.view.tag];} - (void)selectindex:(nsinteger)index { _currentindex = index; cardview *cardview = _cardviewarray[index]; [_scrollview setcontentoffset:cgpointmake(cgrectgetmidx(cardview.frame) - cgrectgetwidth(_scrollview.frame) / 2, 0) animated:yes]; if (_needbackgroundblurimage) { [_bgimageview setimage:[cardview getimage]]; } if (_selectedcard) { _selectedcard(index); }} #pragma mark - 根据 cardview 在 x 轴的中心坐标 设置其 zoomrate- (void)setcardviewzoomrate:(cardview *)cardview { cgfloat offsetrate = abs(_scrollview.contentoffset.x + cgrectgetwidth(_scrollview.frame) / 2 - cgrectgetmidx(cardview.frame)) / _cardviewwidth; cgfloat zoomrate = _maxcardzoomrate - offsetrate; if (zoomrate < _mincardzoomrate) { zoomrate = _mincardzoomrate; } [_scrollview bringsubviewtofront:cardview]; [cardview setzoomrate:zoomrate];} #pragma mark - uiscrollview delegate- (void)scrollviewdidscroll:(uiscrollview *)scrollview { nsinteger index = floorf((scrollview.contentoffset.x - _aroundspacing + cgrectgetwidth(_scrollview.frame) / 2) / _cardviewwidth); if (index < 0) { index = 0; } if (index > [_cardviewarray count] - 1) { index = [_cardviewarray count]; } [self setcardviewzoomrate:_cardviewarray[index]];} - (void)scrollviewdidenddecelerating:(uiscrollview *)scrollview { int index = (scrollview.contentoffset.x - _aroundspacing + cgrectgetwidth(_scrollview.frame) / 2) / _cardviewwidth; [self selectindex:index];} - (void)scrollviewdidenddragging:(uiscrollview *)scrollview willdecelerate:(bool)decelerate { if (!decelerate) { [self scrollviewdidenddecelerating:scrollview]; }} @end |
使用：viewcontroller.m
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#import "viewcontroller.h"#import "cardscrollview.h" @interface viewcontroller () @property (weak, nonatomic) iboutlet cardscrollview *cardscrollview;//@property (nonatomic, strong) cardscrollview *cardscrollview; @property (nonatomic, strong) nsmutablearray<nsstring *> *imgurls; @end @implementation viewcontroller - (nsmutablearray<nsstring *> *)imgurls { if (!_imgurls) { _imgurls = [nsmutablearray array]; for (int i = 0; i < 9; i++) { [_imgurls addobject:[nsstring stringwithformat:@"%d", i + 1]]; } } return _imgurls;} //- (cardscrollview *)cardscrollview {// if (!_cardscrollview) {// _cardscrollview = [[cardscrollview alloc] initwithframe:self.view.bounds];// _cardscrollview.cardviewwidth = 150;// _cardscrollview.needbackgroundblurimage = yes;// }// return _cardscrollview;//} - (void)viewdidappear:(bool)animated { [super viewdidappear:animated];// [self.view addsubview:self.cardscrollview]; [_cardscrollview setimgurls:self.imgurls selectedcard:^(nsinteger selectedindex) { }];} @end |
我一般习惯storyboard开发，所以这里就使用的storyboard拖拽的，代码中注释掉的 是纯代码使用的方法。
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/CBlog_life/article/details/78587033
