iOS实现轮播图banner示例

楼主项目中需要有一个轮播图，因为比较简单，就自己写了个，因为是从网上弄得图片 所以用了sdwebimage 这个三方库 当然自己也可以去掉

类型后面有*号 如用使用 请自行加上。。。。。

代码：.h 文件

@protocol tjxviewdelegate<nsobject>
//判断点击的那个
-(void)sendimagename:(tjxview *)tjxview andname:(nsinteger)selectimage;
@end
@interface tjxview : uiview
@property (nonatomic,weak)id<tjxviewdelegate>delegate;
//传一个frame 和 装有图片名字的数组过来
//参数一：frame
//参数二：装有图片名字的数组
//参数三：bool如果是yes，那么自动滚动，如果是no不滚动
-(id)initwithframe:(cgrect)frame andimagenamearray:
(nsmutablearray * )imagenamearray andisrunning:(bool)isrunning;
@end

.m文件

@interface tjxview()<uiscrollviewdelegate>
{
  nsinteger _currentpage; //记录真实的页码数
  nstimer *_timer; //生命一个全局变量
}
@property (nonatomic,assign) bool isrun;
@property (nonatomic,strong) nsmutablearray *imagearray;//存储图片的名字
@property (nonatomic,strong) uiscrollview *scrollview;
@property (nonatomic,strong) uipagecontrol *pagecontrol;
@property (nonatomic,assign) cgfloat width;//view的宽
@property (nonatomic,assign) cgfloat height;//view的高
@end

-(id)initwithframe:(cgrect)frame andimagenamearray:(nsmutablearray *)imagenamearray andisrunning:(bool)isrunning{
  self = [super initwithframe:frame];
  if (self) {
    _width = self.frame.size.width;
    _height = self.frame.size.height;
    //arraywitharray 把数组中的内容放到一个数组中返回
    self.imagearray = [nsmutablearray arraywitharray:imagenamearray];
    //在数组的尾部添加原数组第一个元素
    [self.imagearray addobject:[imagenamearray firstobject]];
    //在数组的首部添加原数组最后一个元素
    [self.imagearray insertobject:[imagenamearray lastobject] atindex:0];
    self.isrun = isrunning;
    _currentpage = 0;
    [self createsro];
    [self createpagecontrol];
    [self createtimer];
  }
  return self;
}
-(void)createtimer{
  if (_isrun == yes) {
    _timer = [nstimer scheduledtimerwithtimeinterval:2 target:self selector:@selector(change) userinfo:nil repeats:yes ];
    [[nsrunloop currentrunloop]addtimer:_timer formode:nsrunloopcommonmodes];  }
}
-(void)change{
  //1获得当前的点
  cgpoint point = _scrollview.contentoffset;
  //2求得将要变换的点
  cgpoint endpoint = cgpointmake(point.x+_width, 0);
  //判断
  if (endpoint.x == (self.imagearray.count-1)*_width) {
    [uiview animatewithduration:0.25 animations:^{
      _scrollview.contentoffset = cgpointmake(endpoint.x, 0);
    } completion:^(bool finished) {
      //动画完成的block
      _scrollview.contentoffset = cgpointmake(_width, 0);
      cgpoint realend = _scrollview.contentoffset;
      //取一遍页码数
      _currentpage = realend.x/_width;
      _pagecontrol.currentpage = _currentpage-1;
    }];
  }
  else{
    //0.25s中更改一个图片
    [uiview animatewithduration:0.25 animations:^{
      _scrollview.contentoffset = endpoint;
    } completion:^(bool finished) {
    }];
        cgpoint realend = _scrollview.contentoffset;
    //取一遍页码数
    _currentpage = realend.x/_width;
    _pagecontrol.currentpage = _currentpage-1;
  }  
}
//创建页码指示器
-(void)createpagecontrol{
  _pagecontrol = [[uipagecontrol alloc]initwithframe:cgrectmake(_width-200, _height-30, 100, 30)];
  _pagecontrol.centerx = _width/2;
  _pagecontrol.numberofpages = self.imagearray.count-2;
  _pagecontrol.pageindicatortintcolor = wp_gray_color;
  _pagecontrol.currentpageindicatortintcolor = [uicolor whitecolor];
  _pagecontrol.userinteractionenabled = no;
  [self addsubview:_pagecontrol];
}
//创建滚动视图
-(void)createsro{
  _scrollview = [[uiscrollview alloc]initwithframe:cgrectmake(0, 0, _width, _height)];
  _scrollview.contentsize = cgsizemake(_width*self.imagearray.count, _height);
  for (int i = 0; i < self.imagearray.count; i++) {
    uiimageview *imageview = [[uiimageview alloc]initwithframe:cgrectmake(i*_width, 0, _width, _height)];
//    imageview.image = [uiimage imagenamed:self.imagearray[i]];
    [imageview sd_setimagewithurl:self.imagearray[i] placeholderimage:[uiimage imagenamed:@"home_banner_blank"]];
    imageview.userinteractionenabled = yes;
    imageview.tag = 200+i;
    uitapgesturerecognizer *tap = [[uitapgesturerecognizer alloc]initwithtarget:self action:@selector(tap:)];
    [imageview addgesturerecognizer:tap];
    [_scrollview addsubview:imageview];
  }
  //水平指示条不显示
  _scrollview.showshorizontalscrollindicator = no;
  //关闭弹簧效果
  _scrollview.bounces = no;
  //设置用户看到第一张
  _scrollview.contentoffset = cgpointmake(_width, 0);
  //设置代理
  _scrollview.delegate = self;
  //分页效果
  _scrollview.pagingenabled = yes;
  [self addsubview:_scrollview];
}
-(void)tap:(uitapgesturerecognizer *)tap{
  if(_delegate&&[_delegate respondstoselector:@selector(sendimagename:andname:)]){
    [_delegate sendimagename:self andname:tap.view.tag-201];
  }else{
    nslog(@"没有设置代理或者没有事先协议的方法");
  } 
}
#pragma mark uiscrollviewdelegate
//停止滚动
-(void)scrollviewdidenddecelerating:(uiscrollview *)scrollview{
  if (_timer) {
    [_timer setfiredate:[nsdate datewithtimeintervalsincenow:2]];
  }
  //图片的个数 1 2 3 4 5 6 7 8
  //真实的页码 0 1 2 3 4 5 6 7
  //显示的页码  0 1 2 3 4 5
  cgpoint point = _scrollview.contentoffset;
  if (point.x == (self.imagearray.count-1)*_width) {
    scrollview.contentoffset = cgpointmake(_width, 0);
  }
  if (point.x == 0) {
    scrollview.contentoffset = cgpointmake((self.imagearray.count-2)*_width, 0);
  }
  //取一遍页码数
  cgpoint endpoint = scrollview.contentoffset;
  _currentpage = endpoint.x/_width;
  _pagecontrol.currentpage = _currentpage-1;
}
//手指开始触摸的时候，停止计时器
-(void)scrollviewwillbegindragging:(uiscrollview *)scrollview{
  if (_timer) {
    //如果有，停掉
    [_timer setfiredate:[nsdate distantfuture]];
  }
}

在项目中  导入头文件  遵守代理

    tjxview * tjxview = [[tjxview alloc]initwithframe:cgrectmake(0, 0, wpscreen_width, 100*wpscreen_higth_ratio) andimagenamearray:self.bannerimager andisrunning:yes];
    tjxview.delegate = self;
    [self.view addsubview: tjxview];
#pragma mark tjxviewdelegate
-(void)sendimagename:(tjxview *) tjxview andname:(nsinteger)selectimage{
   kklog(@"%ld",(long)selectimage);
}

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