iOS使用 CABasicAnimation 实现简单的跑马灯（无cpu暴涨）

#import <uikit/uikit.h>

@interface loopview : uiview
@property(nonatomic,strong)nsstring *iformation;
@property(nonatomic,strong)nsstring *image;
@end

#import "loopview.h"
#import "uiimageview+webcache.h"
@interface loopview(){
  uilabel *ad;
  uiimageview *headimage;
  cabasicanimation *animation;
   cabasicanimation *animationhead;
}
@end
@implementation loopview
-(instancetype)initwithframe:(cgrect)frame{

  self = [super initwithframe:frame];
  if (self) {
    ad = [[uilabel alloc]initwithframe:cgrectmake(28*wpscreen_width_ratio, 0, self.frame.size.width, self.frame.size.height)];
    [self addsubview:ad];

    ad.textcolor = tjxcolor(146, 152, 169);
    ad.font = [uifont fontwithname:@"gotham-book" size:12*wpscreen_width_ratio];
    ad.textalignment = nstextalignmentleft;
    headimage = [[uiimageview alloc]initwithframe:cgrectmake(0, 0, 20*wpscreen_width_ratio, 20*wpscreen_width_ratio)];

    [self addsubview:headimage];

    headimage.layer.cornerradius = 10;
    headimage.layer.maskstobounds = yes;

    [self sssss];
    [self headimage];
  }
  return self;
}
-(void)setiformation:(nsstring *)iformation{
    ad.text =iformation;
}
-(void)setimage:(nsstring *)image{

   [headimage sd_setimagewithurl:[nsurl urlwithstring:image]];
}
-(void)sssss{


  animation = [cabasicanimation animationwithkeypath:@"position"];
  // 动画选项的设定
  animation.duration = 2; // 持续时间
  animation.repeatcount = maxfloat; // 重复次数
  animation.removedoncompletion = no;
  animation.autoreverses = no;
  // 起始帧和终了帧的设定
  animation.fromvalue = [nsvalue valuewithcgpoint:cgpointmake(ad.layer.position.x, 30*wpscreen_higth_ratio)]; // 起始帧
  animation.tovalue = [nsvalue valuewithcgpoint:cgpointmake(ad.layer.position.x, ad.layer.position.y-20*wpscreen_higth_ratio)]; // 终了帧
  // 添加动画
  [ad.layer addanimation:animation forkey:@"animationmovey"];
//  [headimage.layer addanimation:animation forkey:@"animationmovey"];

}
-(void)headimage{
  animationhead = [cabasicanimation animationwithkeypath:@"position"];
  // 动画选项的设定
  animationhead.duration = 2; // 持续时间
  animationhead.repeatcount = maxfloat; // 重复次数
  animationhead.removedoncompletion = no;
  animationhead.autoreverses = no;
  // 起始帧和终了帧的设定
  animationhead.fromvalue = [nsvalue valuewithcgpoint:cgpointmake(headimage.layer.position.x, 30*wpscreen_higth_ratio)]; // 起始帧
  animationhead.tovalue = [nsvalue valuewithcgpoint:cgpointmake(headimage.layer.position.x, headimage.layer.position.y-20*wpscreen_higth_ratio)]; // 终了帧
  // 添加动画
  [headimage.layer addanimation:animationhead forkey:@"animationmovey"];

}