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iOS实现带有缩放效果的自动轮播图

︶ㄣ米米素材网 メ
米米素材网V管理员 / 阅读
0919

这篇文章主要为大家详细介绍了iOS带有缩放效果的自动轮播图，文中示例代码介绍的非常详细，具有一定的参考价值，感兴趣的小伙伴们可以参考一下

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。

iOS实现带有缩放效果的自动轮播图

直接上代码。

.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：

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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内容，希望对大家的学习有所帮助，也希望大家多多支持米米素材网。

原文链接：https://blog.csdn.net/NB_Token/article/details/73649517