本文實例為大家分享了ios帶有縮放效果的自動輪播圖，供大家參考，具體內容如下
可直接設置frame然后加載到視圖上使用。
效果就是這樣的，圖片切換的過程中還是有卡頓，不夠流暢，后續更新。
直接上代碼。
.h文件包含：
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#import <uikit/uikit.h> @interface customscrollview : uiview @property (strong,nonatomic) nsarray *imagearr; @end |
.m文件包含:
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#import "customscrollview.h" @interface customscrollview ()<uiscrollviewdelegate> @property (strong,nonatomic) uiscrollview *scrollview; @property (strong,nonatomic) uiimageview *backimageview; @property (strong,nonatomic) uiimageview *leftiamgeview; @property (strong,nonatomic) uiimageview *middleimageview; @property (strong,nonatomic) uiimageview *rightimageview; @property (strong,nonatomic) uipagecontrol *pagecontrol; //高度 @property (assign,nonatomic) cgfloat scrollviewheight; //手動造成的偏移量 @property (assign,nonatomic) cgfloat offsetx; @property (strong,nonatomic) nstimer *timer; //屬于計時器方法動畫持續時間 ？ @property (assign,nonatomic) bool timeranimation; @end //左右內容的最大偏移量 #define offset_max ([uiscreen mainscreen].bounds.size.width-64)*0.9 @implementation customscrollview - (instancetype)initwithframe:(cgrect)frame { if (self = [super initwithframe:frame]) { self.scrollviewheight = frame.size.height; [self addsubview:self.backimageview]; [self addsubview:self.scrollview]; [self addsubview:self.pagecontrol]; [self.backimageview mas_makeconstraints:^(masconstraintmaker *make) { make.edges.with.mas_equalto(self); }]; [self.scrollview mas_makeconstraints:^(masconstraintmaker *make) { make.edges.with.mas_equalto(self); }]; [self.pagecontrol mas_makeconstraints:^(masconstraintmaker *make) { make.left.right.bottom.mas_equalto(self); make.height.mas_equalto(@20); }]; self.timer = [nstimer scheduledtimerwithtimeinterval:5 target:self selector:@selector(timeraction) userinfo:nil repeats:yes]; [[nsrunloop mainrunloop] addtimer:self.timer formode:nsdefaultrunloopmode]; [self.timer setfiredate:[nsdate datewithtimeintervalsincenow:5]]; } return self; } - (nsarray *)imagearr { if (!_imagearr) { _imagearr = @[@"timg-0",@"timg-1",@"timg-2"]; } return _imagearr; } - (uiimageview *)backimageview { if (!_backimageview) { _backimageview = [[uiimageview alloc] init]; _backimageview.image = [uiimage imagenamed:@"bg_home"]; } return _backimageview; } - (uiscrollview *)scrollview { if (!_scrollview) { _scrollview = [[uiscrollview alloc] init]; _scrollview.showsverticalscrollindicator = no; _scrollview.showshorizontalscrollindicator = no; _scrollview.contentsize = cgsizemake(kscreenwidth+2*offset_max, self.scrollviewheight); [_scrollview setcontentoffset:cgpointmake(offset_max, 0)]; _scrollview.bounces = no; _scrollview.delegate = self; _leftiamgeview = [[uiimageview alloc] init]; _leftiamgeview.image = [uiimage imagenamed:self.imagearr[0]]; _leftiamgeview.layer.cornerradius = 5; _leftiamgeview.layer.maskstobounds = yes; _middleimageview = [[uiimageview alloc] init]; _middleimageview.image = [uiimage imagenamed:self.imagearr[1]]; _middleimageview.layer.cornerradius = 5; _middleimageview.layer.maskstobounds = yes; _rightimageview = [[uiimageview alloc] init]; _rightimageview.image = [uiimage imagenamed:self.imagearr[2]]; _rightimageview.layer.cornerradius = 5; _rightimageview.layer.maskstobounds = yes; [_scrollview addsubview:_leftiamgeview]; [_scrollview addsubview:_middleimageview]; [_scrollview addsubview:_rightimageview]; [_leftiamgeview mas_makeconstraints:^(masconstraintmaker *make) { make.size.mas_equalto(cgsizemake((kscreenwidth-64)*0.9, self.scrollviewheight*0.9)); make.centery.mas_equalto(_scrollview); make.right.mas_equalto(_middleimageview.mas_left).offset(-20); }]; [_middleimageview mas_makeconstraints:^(masconstraintmaker *make) { make.size.mas_equalto(cgsizemake(kscreenwidth-64, self.scrollviewheight)); make.centery.mas_equalto(_scrollview); make.left.mas_equalto(_scrollview).offset(offset_max+64/2); }]; [_rightimageview mas_makeconstraints:^(masconstraintmaker *make) { make.size.mas_equalto(_leftiamgeview); make.centery.mas_equalto(_scrollview); make.left.mas_equalto(_middleimageview.mas_right).offset(20); }]; } return _scrollview; } - (uipagecontrol *)pagecontrol { if (!_pagecontrol) { _pagecontrol = [[uipagecontrol alloc] init]; _pagecontrol.numberofpages = self.imagearr.count; _pagecontrol.enabled = no; _pagecontrol.currentpage = 0; _pagecontrol.hidesforsinglepage = yes; _pagecontrol.pageindicatortintcolor = [uicolor whitecolor]; _pagecontrol.currentpageindicatortintcolor = maincolor; } return _pagecontrol; } #pragma mark ------------ uiscrollviewdelegate -------- - (void)scrollviewdidscroll:(uiscrollview *)scrollview { if (self.timeranimation) { return; } cgfloat offscale = scrollview.contentoffset.x - offset_max; if (offscale < 0) { //右滑 self.leftiamgeview.layer.transformscale = 1 + 1.0/9*(fabs(offscale)/offset_max); self.middleimageview.layer.transformscale = 1 - 0.1*(fabs(offscale)/offset_max); } else { //左滑 self.rightimageview.layer.transformscale = 1 + 1.0/9*(fabs(offscale)/offset_max); self.middleimageview.layer.transformscale = 1 - 0.1*(fabs(offscale)/offset_max); } } - (void)scrollviewdidenddragging:(uiscrollview *)scrollview willdecelerate:(bool)decelerate { cgpoint offset = scrollview.contentoffset; self.offsetx = offset.x; if ((fabs(self.offsetx-offset_max) >= offset_max*0.5)) { if (!decelerate) { //替換圖片 [self exchangeimage]; } } else { //回彈復位 [scrollview setcontentoffset:cgpointmake(offset_max, 0) animated:yes]; self.leftiamgeview.layer.transform = catransform3didentity; self.middleimageview.layer.transform = catransform3didentity; self.rightimageview.layer.transform = catransform3didentity; } } - (void)scrollviewdidenddecelerating:(uiscrollview *)scrollview { //替換圖片 [self exchangeimage]; } #pragma mark ---------- exchangeimage ------ //替換圖片 - (void)exchangeimage { if (self.offsetx-offset_max < 0) { //右滑 uiimage *rightimage = self.rightimageview.image; self.rightimageview.image = self.middleimageview.image; self.middleimageview.image = self.leftiamgeview.image; self.leftiamgeview.image = rightimage; if (self.pagecontrol.currentpage - 1 < 0) { self.pagecontrol.currentpage = self.pagecontrol.numberofpages-1; } else { self.pagecontrol.currentpage -= 1; } } else { //左滑 uiimage *leftimage = self.leftiamgeview.image; self.leftiamgeview.image = self.middleimageview.image; self.middleimageview.image = self.rightimageview.image; self.rightimageview.image = leftimage; if (self.pagecontrol.currentpage + 1 >= self.pagecontrol.numberofpages) { self.pagecontrol.currentpage = 0; } else { self.pagecontrol.currentpage += 1; } } [self.scrollview setcontentoffset:cgpointmake(offset_max, 0)]; self.leftiamgeview.layer.transform = catransform3didentity; self.middleimageview.layer.transform = catransform3didentity; self.rightimageview.layer.transform = catransform3didentity; } #pragma mark ---------- timer -------- - (void)timeraction { self.offsetx = kscreenwidth+offset_max-64; self.timeranimation = yes; [uiview animatewithduration:0.8 animations:^{ [self.scrollview setcontentoffset:cgpointmake(self.offsetx, 0)]; self.rightimageview.layer.transformscale = 10/9.0; self.middleimageview.layer.transformscale = 0.9; } completion:^(bool finished) { self.timeranimation = no; [self exchangeimage]; self.rightimageview.layer.transform = catransform3didentity; self.middleimageview.layer.transform = catransform3didentity; }]; } @end |
最后調用：
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self.scrollview = [[customscrollview alloc] initwithframe:cgrectmake(0, 0, kscreenwidth, 170)]; [self.view addsubview:self.scrollview]; |
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持服務器之家。
原文鏈接：https://blog.csdn.net/NB_Token/article/details/73649517
