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iOS下拉、上拉刷新控件的封装

转载 作者：qq735679552 更新时间：2022-09-28 22:32:09 27 4
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这篇CFSDN的博客文章iOS下拉、上拉刷新控件的封装由作者收集整理，如果你对这篇文章有兴趣，记得点赞哟.

ios 封装下拉、上拉刷新控件，首先看下效果图:

iOS下拉、上拉刷新控件的封装

简单阐述一下：自定义头部、尾部刷新视图，继承uiview，通过kvo监听scrollview的滑动，通过偏移量设置刷新状态，通过修改状态修改scrollview的滚动位置。建一个uiscrollview的分类，添加上拉、下拉刷新及回调的方法，可以让uitableview、uicollectionview直接调用。现在很多应用是在滑动到底部自动进行上拉加载超做，可以在scrollviewdidscroll这个代理方法中手动调用尾部刷新.

下面贴上主要相关代码:

控制器viewcontroller:

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#import <uikit/uikit.h>
 
@interface viewcontroller : uiviewcontroller
 
@end
 
/*** ---------------分割线--------------- ***/
 
#import "viewcontroller.h"
#import "hwrefresh.h"
 
@interface viewcontroller ()<uitableviewdatasource, uitableviewdelegate>
 
@property (nonatomic, strong) nsmutablearray *array;
@property (nonatomic, strong) uitableview *tableview;
@property (nonatomic, assign) nsinteger page;
 
@end
 
@implementation viewcontroller
 
- (nsmutablearray *)array
{
  if (!_array) {
   _array = [nsmutablearray array];
  }
 
  return _array;
}
 
- ( void )viewdidload {
  [super viewdidload];
 
  self.view.backgroundcolor = [uicolor blackcolor];
  self.page = 1;
 
  //模拟获取信息
  [self getinfo];
 
  //创建控件
  [self creatcontrol];
 
  //添加头部刷新
  [self addheaderrefresh];
 
  //添加尾部刷新
  [self addfooterrefresh];
}
 
- ( void )getinfo
{
  nsarray *array = @[@ "ios hero博客" , @ "ios hero博客" , @ "ios hero博客" , @ "ios hero博客" , @ "http://blog.csdn.net/hero_wqb" ];
  dispatch_after(dispatch_time(dispatch_time_now, (int64_t)(2.0f * nsec_per_sec)), dispatch_get_main_queue(), ^{
   if (self.page == 1) {
    self.array = [nsmutablearray arraywitharray:array];
   } else {
    [self.array addobjectsfromarray:array];
   }
   [_tableview reloaddata];
   [_tableview headerendrefreshing];
   [_tableview footerendrefreshing];
   nslog(@ "已经刷新好了" );
  });
}
 
- ( void )creatcontrol
{
  //列表视图
  _tableview = [[uitableview alloc] initwithframe:cgrectmake(20, 64, [[uiscreen mainscreen] bounds].size.width - 100, [[uiscreen mainscreen] bounds].size.height - 164) style:uitableviewstyleplain];
  _tableview.datasource = self;
  _tableview.delegate = self;
  [self.view addsubview:_tableview];
}
 
- ( void )addheaderrefresh
{
  __weak typeof(self) weakself = self;
  [_tableview addheaderrefreshwithcallback:^{
   __strong typeof(weakself) strongself = weakself;
   strongself.page = 1;
   [strongself getinfo];
  }];
}
 
- ( void )addfooterrefresh
{
  __weak typeof(self) weakself = self;
  [_tableview addfooterrefreshwithcallback:^{
   __strong typeof(weakself) strongself = weakself;
   strongself.page ++;
   [strongself getinfo];
  }];
}
 
#pragma mark - uitableviewdatasource
- (nsinteger)tableview:(uitableview *)tableview numberofrowsinsection:(nsinteger)section
{
  return self.array.count;
}
 
- (uitableviewcell *)tableview:(uitableview *)tableview cellforrowatindexpath:(nsindexpath *)indexpath
{
  static nsstring *identifier = @ "refreshtest" ;
  uitableviewcell *cell = [tableview dequeuereusablecellwithidentifier:identifier];
  if (!cell) {
   cell = [[uitableviewcell alloc] initwithstyle:uitableviewcellstyledefault reuseidentifier:identifier];
  }
  cell.textlabel.text = [_array[indexpath.row] stringbyappendingstring:[nsstring stringwithformat:@ "_%ld" , indexpath.row]];
 
  return cell;
}
 
- ( void )scrollviewdidscroll:(uiscrollview *)scrollview
{
  //滑动到底部自动刷新
  if (_tableview.contentsize.height > _tableview.frame.size.height && _tableview.contentoffset.y + _tableview.frame.size.height > _tableview.contentsize.height - 40 && _page < 50) {
   [_tableview footerbeginrefreshing];
  }
}
 
@end

刷新基类hwrefreshbaseview:

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#import <uikit/uikit.h>
 
#define hwrefreshcontentoffset @"contentoffset"
 
typedef enum {
  hwrefreshstatenormal = 0, //普通状态
  hwrefreshstatepulling,  //释放即可刷新的状态
  hwrefreshstaterefreshing, //正在刷新中的状态
} hwrefreshstate;
 
@interface hwrefreshbaseview : uiview
 
@property (nonatomic, weak) uiscrollview *scrollview;
@property (nonatomic, copy) nsstring *pulltorefreshtext;
@property (nonatomic, copy) nsstring *releasetorefreshtext;
@property (nonatomic, copy) nsstring *refreshingtext;
@property (nonatomic, copy) void (^refreshingcallback)();
@property (nonatomic, assign) hwrefreshstate state;
@property (nonatomic, assign) uiedgeinsets scrollvieworiginalinset;
 
- ( void )beginrefreshing;
- ( void )endrefreshing;
 
@end
 
/*** ---------------分割线--------------- ***/
 
#import "hwrefreshbaseview.h"
 
#define khwrefreshviewheight 44.0f
#define kimagew 30.0f
#define klabelw 100.0f
 
@interface hwrefreshbaseview ()
 
@property (nonatomic, weak) uilabel *rlabel;
@property (nonatomic, weak) uiimageview *rimageview;
 
@end
 
@implementation hwrefreshbaseview
 
- (instancetype)initwithframe:(cgrect)frame
{
  frame.size.height = khwrefreshviewheight;
  if (self = [super initwithframe:frame]) {
   cgfloat imageh = 30.f;
   cgfloat labelh = 20.f;
   cgfloat imagex = ([uiscreen mainscreen].bounds.size.width - kimagew - klabelw) * 0.5;
   cgfloat imagey = (khwrefreshviewheight - imageh) * 0.5;
   cgfloat labely = (khwrefreshviewheight - labelh) * 0.5;
  
   //图片
   uiimageview *rimageview = [[uiimageview alloc] initwithframe:cgrectmake(imagex, imagey, kimagew, imageh)];
   rimageview.image = [uiimage imagenamed:@ "refreshing.jpg" ];
   [self addsubview:rimageview];
   self.rimageview = rimageview;
  
   //标签
   uilabel *rlabel = [[uilabel alloc] initwithframe:cgrectmake(cgrectgetmaxx(rimageview.frame), labely, klabelw, labelh)];
   rlabel.text = self.pulltorefreshtext;
   rlabel.font = [uifont systemfontofsize:14.0f];
   rlabel.textalignment = nstextalignmentcenter;
   [self addsubview:rlabel];
   self.rlabel = rlabel;
  }
 
  return self;
}
 
- ( void )willmovetosuperview:(uiview *)newsuperview
{
  [super willmovetosuperview:newsuperview];
 
  //旧的父控件
  [self.superview removeobserver:self forkeypath:hwrefreshcontentoffset context:nil];
 
  //新的父控件
  if (newsuperview) {
   [newsuperview addobserver:self forkeypath:hwrefreshcontentoffset options:nskeyvalueobservingoptionnew context:nil];
  
   //记录uiscrollview
   _scrollview = (uiscrollview *)newsuperview;
  
   //记录uiscrollview最开始的contentinset
   _scrollvieworiginalinset = _scrollview.contentinset;
  }
 
  //居中显示图片、提示信息
  cgrect temframe = _rimageview.frame;
  temframe.origin.x = (newsuperview.frame.size.width - kimagew - klabelw) * 0.5;
  _rimageview.frame = temframe;
 
  cgrect tf = _rlabel.frame;
  tf.origin.x = cgrectgetmaxx(_rimageview.frame);
  _rlabel.frame = tf;
}
 
- ( void )setpulltorefreshtext:(nsstring *)pulltorefreshtext
{
  _pulltorefreshtext = pulltorefreshtext;
 
  self.rlabel.text = pulltorefreshtext;
}
 
- ( void )setstate:(hwrefreshstate)state
{
  if (_state == state) return ;
 
  switch (state) {
   case hwrefreshstatenormal: {
    [self stopanimating];
    self.rlabel.text = self.pulltorefreshtext;
    break ;
   }
   
   case hwrefreshstatepulling: {
    self.rlabel.text = self.releasetorefreshtext;
    break ;
   }
   
   case hwrefreshstaterefreshing: {
    [self startanimating];
    self.rlabel.text = self.refreshingtext;
    if (self.refreshingcallback) self.refreshingcallback();
    break ;
   }
   
   default :
    break ;
  }
 
  _state = state;
}
 
//开始刷新
- ( void )beginrefreshing
{
  self.state = hwrefreshstaterefreshing;
}
 
//结束刷新
- ( void )endrefreshing
{
  self.state = hwrefreshstatenormal;
}
 
//开始动画
- ( void )startanimating
{
  nsmutablearray *array = [nsmutablearray array];
  for ( int i = 0; i < 2; i++) {
   nsstring *imagename = [nsstring stringwithformat:@ "refreshing%02d.jpg" , i + 1];
   uiimage *image = [uiimage imagenamed:imagename];
   [array addobject:image];
  }
 
  [_rimageview setanimationimages:array];
  [_rimageview setanimationduration:0.3f];
  [_rimageview startanimating];
}
 
//结束动画
- ( void )stopanimating
{
  if (_rimageview.isanimating) {
   [_rimageview stopanimating];
   [_rimageview performselector:@selector(setanimationimages:) withobject:nil afterdelay:0];
  }
}
 
@end

头部刷新hwrefreshheader:

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#import "hwrefreshbaseview.h"
 
@interface hwrefreshheader : hwrefreshbaseview
 
+ (instancetype)header;
 
@end
 
/*** ---------------分割线--------------- ***/
 
#import "hwrefreshheader.h"
 
@implementation hwrefreshheader
 
+ (instancetype)header
{
  return [[hwrefreshheader alloc] init];
}
 
- (instancetype)initwithframe:(cgrect)frame
{
  if (self = [super initwithframe:frame]) {
   self.pulltorefreshtext = @ "下拉即可刷新" ;
   self.releasetorefreshtext = @ "释放即可刷新" ;
   self.refreshingtext = @ "刷新中..." ;
  }
 
  return self;
}
 
- ( void )willmovetosuperview:(uiview *)newsuperview
{
  [super willmovetosuperview:newsuperview];
 
  //设置自己的位置和尺寸
  cgrect frame = self.frame;
  frame.origin.y = - self.frame.size.height;
  self.frame = frame;
}
 
 
- ( void )observevalueforkeypath:(nsstring *)keypath ofobject:(id)object change:(nsdictionary *)change context:( void *)context
{
  //不能跟用户交互或正在刷新就直接返回
  if (!self.userinteractionenabled || self.alpha <= 0.01 || self.hidden || self.state == hwrefreshstaterefreshing) return ;
 
  //根据偏移量设置相应状态
  if ([keypath isequaltostring:hwrefreshcontentoffset]) {
   [self setstatewithcontentoffset];
  }
}
 
- ( void )setstatewithcontentoffset
{
  //当前的contentoffset
  cgfloat currentoffsety = self.scrollview.contentoffset.y;
 
  //头部控件刚好出现的offsety
  cgfloat happenoffsety = - self.scrollvieworiginalinset.top;
 
  //如果是向上滚动到看不见头部控件，直接返回
  if (currentoffsety >= happenoffsety) return ;
 
  //滑动时
  if (self.scrollview.isdragging) {
   //普通状态和即将刷新状态的临界点
   cgfloat normaltopullingoffsety = happenoffsety - self.frame.size.height;
  
   //转为即将刷新状态
   if (self.state == hwrefreshstatenormal && currentoffsety < normaltopullingoffsety) {
    self.state = hwrefreshstatepulling;
   
   //转为普通状态
   } else if (self.state == hwrefreshstatepulling && currentoffsety >= normaltopullingoffsety) {
    self.state = hwrefreshstatenormal;
   }
  
  //松手时，如果是松开就可以进行刷新的状态，则进行刷新
  } else if (self.state == hwrefreshstatepulling) {
   self.state = hwrefreshstaterefreshing;
  }
}
 
- ( void )setstate:(hwrefreshstate)state
{
  //若状态未改变，直接返回
  if (self.state == state) return ;
 
  //保存旧状态
  hwrefreshstate oldstate = self.state;
 
  //调用父类方法
  [super setstate:state];
 
  switch (state) {
   case hwrefreshstatenormal: {
    //如果由刷新状态返回到普通状态
    if (oldstate == hwrefreshstaterefreshing) {
     [uiview animatewithduration:0.25f animations:^{
      uiedgeinsets inset = self.scrollview.contentinset;
      inset.top -= self.frame.size.height;
      self.scrollview.contentinset = inset;
     }];
    }
    break ;
   }
   
   case hwrefreshstatepulling: {
    break ;
   }
   
   case hwrefreshstaterefreshing: {
    //执行动画
    [uiview animatewithduration:0.25f animations:^{
     cgfloat top = self.scrollvieworiginalinset.top + self.frame.size.height;
    
     //增加滚动区域
     uiedgeinsets inset = self.scrollview.contentinset;
     inset.top = top;
     self.scrollview.contentinset = inset;
    
     //设置滚动位置
     cgpoint offset = self.scrollview.contentoffset;
     offset.y = - top;
     self.scrollview.contentoffset = offset;
    }];
    break ;
   }
   
   default :
    break ;
  }
 
  self.state = state;
}
 
@end

分类uiscrollview+hwrefresh:

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#import <uikit/uikit.h>
 
@interface uiscrollview (hwrefresh)
 
//添加下拉刷新回调
- ( void )addheaderrefreshwithcallback:( void (^)())callback;
 
//让下拉刷新控件停止刷新
- ( void )headerendrefreshing;
 
//添加上拉刷新回调
- ( void )addfooterrefreshwithcallback:( void (^)())callback;
 
//让上拉刷新控件开始刷新
- ( void )footerbeginrefreshing;
 
//让上拉刷新控件停止刷新
- ( void )footerendrefreshing;
 
@end
 
/*** ---------------分割线--------------- ***/
 
#import "uiscrollview+hwrefresh.h"
#import "hwrefreshheader.h"
#import "hwrefreshfooter.h"
#import <objc/runtime.h>
 
@interface uiscrollview ()
 
@property (nonatomic, weak) hwrefreshheader *header;
@property (weak, nonatomic) hwrefreshfooter *footer;
 
@end
 
@implementation uiscrollview (hwrefresh)
 
static char hwrefreshheaderkey;
static char hwrefreshfooterkey;
 
- ( void )setheader:(hwrefreshheader *)header
{
  [self willchangevalueforkey:@ "hwrefreshheaderkey" ];
  objc_setassociatedobject(self, &hwrefreshheaderkey, header, objc_association_assign);
  [self didchangevalueforkey:@ "hwrefreshheaderkey" ];
}
 
- (hwrefreshheader *)header
{
  return objc_getassociatedobject(self, &hwrefreshheaderkey);
}
 
- ( void )setfooter:(hwrefreshfooter *)footer
{
  [self willchangevalueforkey:@ "hwrefreshfooterkey" ];
  objc_setassociatedobject(self, &hwrefreshfooterkey, footer, objc_association_assign);
  [self didchangevalueforkey:@ "hwrefreshfooterkey" ];
}
 
- (hwrefreshfooter *)footer
{
  return objc_getassociatedobject(self, &hwrefreshfooterkey);
}
 
- ( void )addheaderrefreshwithcallback:( void (^)())callback
{
  if (!self.header) {
   hwrefreshheader *header = [hwrefreshheader header];
   [self addsubview:header];
   self.header = header;
  }
 
  self.header.refreshingcallback = callback;
}
 
- ( void )headerendrefreshing
{
  [self.header endrefreshing];
}
 
- ( void )addfooterrefreshwithcallback:( void (^)())callback
{
  if (!self.footer) {
   hwrefreshfooter *footer = [hwrefreshfooter footer];
   [self addsubview:footer];
   self.footer = footer;
  }
 
  self.footer.refreshingcallback = callback;
}
 
- ( void )footerbeginrefreshing
{
  [self.footer beginrefreshing];
}
 
- ( void )footerendrefreshing
{
  [self.footer endrefreshing];
}
 
@end

demo下载链接 。

写博客的初心是希望大家共同交流成长，博主水平有限难免有偏颇之处，欢迎批评指正.

原文链接：https://blog.csdn.net/hero_wqb/article/details/73554721 。

最后此篇关于iOS下拉、上拉刷新控件的封装的文章就讲到这里了,如果你想了解更多关于iOS下拉、上拉刷新控件的封装的内容请搜索CFSDN的文章或继续浏览相关文章，希望大家以后支持我的博客！ 。

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