iOS实现带有缩放效果的自动轮播图

本文实例为大家分享了ios带有缩放效果的自动轮播图，供大家参考，具体内容如下

可直接设置frame然后加载到视图上使用。

效果就是这样的，图片切换的过程中还是有卡顿，不够流畅，后续更新。

直接上代码。

.h文件包含：

#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;

//手动造成的偏移量

@property (assign,nonatomic) cgfloat offsetx;

@property (strong,nonatomic) nstimer *timer;

//属于计时器方法动画持续时间？

@property (assign,nonatomic) bool timeranimation;

@end

//左右内容的最大偏移量

#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) {

//替换图片

[self exchangeimage];

}

} else {

//回弹复位

[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 {

//替换图片

[self exchangeimage];

}

#pragma mark ---------- exchangeimage ------

//替换图片

- (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

最后调用：

iOS实现带有缩放效果的自动轮播图

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