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iOS实现带有缩放效果的自动轮播图

转载 作者：qq735679552 更新时间：2022-09-27 22:32:09 31 4
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这篇CFSDN的博客文章iOS实现带有缩放效果的自动轮播图由作者收集整理，如果你对这篇文章有兴趣，记得点赞哟.

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我.

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

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