iOS实现轮盘动态效果

    本文实例为大家分享了iOS实现轮盘动态效果的具体代码,供大家参考,具体内容如下

    一个常用的绘图,主要用来打分之类的动画,效果如下。

    主要是iOS的绘图和动画,本来想用系统自带动画实现呢,发现实现不了,用了其他办法延时并重绘视图没有成功,用了gcd延时,nsthread休眠,performselector delay 都不行。最后用了一个定时器实现类似效果,总感觉不太明智,以后应该考虑下对CALayer和

    隐式动画的角度考虑下

    
    #import <UIKit/UIKit.h>
     
    /**
     *  自定义变量里面以s结尾的表示具体的数值,否则表示的是表示显示具体内容的标签,以lbe的表示对内容的说明
     
       比如comments 表示的具体评价内容,comment 表示评价的具体内容,lbecomment 是一个显示 "评价:"的标签
     */
     
    @interface ScorePlateView : UIView
     
    /*速度满意度*/
    @property (nonatomic,assign) CGFloat speedValues;
     
    /*态度满意度*/
    @property (nonatomic,assign) CGFloat altitudeValues;
     
    /*把半圆分割的份数*/
    @property (nonatomic,assign) int precision;
    /**
     * 整体评价
     */
    @property (nonatomic,strong) NSString * comments;
    /**
     * 满分是多少分
     */
    @property (nonatomic,assign) CGFloat fullValues;
    /**
     * 综合评分
     */
    @property (nonatomic,assign) CGFloat compreValues;
    /**
     * 开始角度
     */
     
    @property (nonatomic,assign) CGFloat startAngle;
    /**
     * 终止角度
     */
    @property (nonatomic,assign) CGFloat endAngle;
     
    //-(void)startAnimation;
    @end
    
    #import "ScorePlateView.h"
     
    @interface ScorePlateView()
    {
      CGFloat d_speed;//执行动画时候每个的增量
      CGFloat d_altitude;
      CGFloat d_comp;
    }
     
    @property (nonatomic,strong) UILabel*lbeCompreValue;//综合分数的标签
     
    @property (nonatomic,strong) UILabel *compreValue;//综合分数的具体数值
     
    @property (nonatomic,strong) UILabel * comment;//评价
     
    @property (nonatomic,assign) CGFloat cur_speedV;//当前的值
     
    @property (nonatomic,assign) CGFloat cur_altitudeV;//当前的态度;
     
    @property (nonatomic,assign) CGFloat cur_compV;//当前的综合分数
    @property (nonatomic,assign) NSTimer * timer;
     
    @end
     
    @implementation ScorePlateView
     
    - (instancetype)initWithFrame:(CGRect)frame
    {
      if (self = [super initWithFrame:frame]) {
        
        self.precision= 50;//这里设置默认值;
        self.fullValues =5;
        self.altitudeValues=3.0;
        self.speedValues=4.0;
        self.backgroundColor = [UIColor clearColor];
        self.startAngle=0.1*M_PI;
        self.endAngle = 0.9*M_PI;
        self.comments =@"真是太不可思议了";
        self.backgroundColor = [UIColor greenColor];
        _cur_compV=0;
        _cur_speedV=0;
        _cur_altitudeV=0;
      }
      return self;
    }
    - (void)drawRect:(CGRect)rect {
      
      //1. 画圆
      
      CGFloat circleMargin = 0; //上下两个半圆的间距
      CGFloat topBottomMargin =20;//这个间距用来显示服务态度和服务速度那样标签内容
      
      CGFloat radius = (self.frame.size.height-circleMargin-2*topBottomMargin)/2;//半径
      //上边圆的圆心
      CGPoint centerTop = CGPointMake(self.frame.size.width/2,self.frame.size.height/2-circleMargin/2);
      [self drawHalfCircle:centerTop andWithRadius:radius isTop:YES];
      //下面圆的圆心
      CGPoint centerBottom = CGPointMake(self.frame.size.width/2, self.frame.size.height/2+circleMargin/2);
      [self drawHalfCircle:centerBottom andWithRadius:radius isTop:NO];
      
      //2. 创建需要的标签,并在合适的位置绘制内容
      UILabel * lbeAltitude = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, topBottomMargin)];
      lbeAltitude.text = @"服务速度";
      lbeAltitude.textColor = [UIColor whiteColor];
      lbeAltitude.textAlignment = NSTextAlignmentCenter;
      lbeAltitude.font = [UIFont systemFontOfSize:12];
      [lbeAltitude drawTextInRect:lbeAltitude.frame];
      
      //服务态度评分
      UILabel * lbeSpeed = [[UILabel alloc]initWithFrame:CGRectMake(0, self.frame.size.height-topBottomMargin, self.frame.size.width, topBottomMargin)];
      lbeSpeed.text = @"服务态度";
      lbeSpeed.textColor = [UIColor whiteColor];
      lbeSpeed.textAlignment = NSTextAlignmentCenter;
      lbeSpeed.font = [UIFont systemFontOfSize:12];
      [lbeSpeed drawTextInRect:lbeSpeed.frame];
      
      //绘制综合评分
      NSString *attitudeScore = [NSString stringWithFormat:@"%.2f/%.2f",_cur_altitudeV,self.fullValues];
      NSMutableAttributedString* attributeString = [[NSMutableAttributedString alloc]initWithString:attitudeScore];
      [attributeString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:26] range:NSMakeRange(0, 4)];
      [attributeString addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:16] range:NSMakeRange(4, 3)];
      self.compreValue = [[UILabel alloc]initWithFrame:CGRectMake(0, radius-topBottomMargin,self.frame.size.width, 2*topBottomMargin)];
      self.compreValue.attributedText = attributeString;
      self.compreValue.textAlignment = NSTextAlignmentCenter;
      self.compreValue.textColor = [UIColor whiteColor];
      self.compreValue.frame = CGRectMake(0, centerTop.y-topBottomMargin+circleMargin/2, self.frame.size.width, topBottomMargin*2);
      [self.compreValue drawTextInRect:self.compreValue.frame];
      
      self.lbeCompreValue = [[UILabel alloc]initWithFrame:CGRectMake(0, centerTop.y-radius*0.5, self.frame.size.width, topBottomMargin*2)];
      self.lbeCompreValue.text =@"综合评分";
      self.lbeCompreValue.textAlignment = NSTextAlignmentCenter;
      self.lbeCompreValue.textColor = [UIColor whiteColor];
      self.lbeCompreValue.font = [UIFont systemFontOfSize:14];
      [self.lbeCompreValue drawTextInRect:self.lbeCompreValue.frame];
      //评价内容
      self.comment = [[UILabel alloc]initWithFrame:CGRectMake(topBottomMargin+circleMargin+radius/2, CGRectGetMaxY(self.compreValue.frame), radius, topBottomMargin*2)];
      self.comment.text =self.comments;
      self.comment.numberOfLines=0;
      self.comment.textAlignment = NSTextAlignmentCenter;
      self.comment.textColor = [UIColor whiteColor];
      self.comment.font = [UIFont systemFontOfSize:14];
      [self.comment drawTextInRect:self.comment.frame];
      
    }
    /**
     * 画半圆 绘制刻度的时候可以先绘制从圆心的线,最后用一个内圆裁剪的方式,但是如果要求背景随时变化就局限了,特别是父视图背景是渐变的,要么重新定义该类,要么把这个类视图定义为透明,从而透过父视图背景颜色
      透明的背景无法掩盖从圆心出发的线,
     *
     * @param center 圆心坐标
     * @param radius 半径
     * @param top  是不是画上面的圆
     */
    -(void)drawHalfCircle:(CGPoint) center andWithRadius:(CGFloat)radius isTop:(BOOL) top
    {
      
      //画上面圆的边框
      CGContextRef ctx = UIGraphicsGetCurrentContext();
      CGContextSetStrokeColorWithColor(ctx, [UIColor whiteColor].CGColor);
      if (top) {
        CGContextAddArc(ctx, center.x, center.y, radius, -self.startAngle, -self.endAngle, 1);
      }
      else
      {
        CGContextAddArc(ctx, center.x, center.y, radius,self.startAngle,self.endAngle, 0);
      }
      //设置线的宽度
      CGContextSetLineWidth(ctx, 1);
      CGContextSetStrokeColorWithColor(ctx, [UIColor whiteColor].CGColor);
      CGContextStrokePath(ctx);
      //绘制上下圆的分割线
      CGContextSetLineWidth(ctx, 2);//设置线宽
      CGFloat borderValue;
      if (top) {
        borderValue=_cur_altitudeV/self.fullValues;//设置边界值
      }
      else
      {
        borderValue =_cur_speedV/self.fullValues;
      }
      //实现动画效果,只能先画刻度,再画具体值
      for (int i=1; i<self.precision; i++)//画刻度
      {
        
        CGContextSetRGBStrokeColor(ctx, 1.0, 1.0, 1.0, 0.5);//设置白色 透明
        CGFloat endX,endY,startX,startY;//刻度的长度是这里 7 -2 =5;
        if (top) {
          startX = center.x -(radius-10)*cos((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);
          startY = center.y - (radius-10)*sin((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);
          endX = center.x - (radius-2)*cos((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);//圆上的点的x坐标
          endY = center.y - (radius-2)*sin((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);//圆上的点的y坐标
        }
        else
        {
          startX = center.x +(radius-10)*cos((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);
          startY = center.y + (radius-10)*sin((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);
          endX = center.x + (radius-2)*cos((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);//圆上的点的x坐标
          endY = center.y + (radius-2)*sin((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);//圆上的点的y坐标
        }
        CGContextMoveToPoint(ctx, startX, startY);
        CGContextAddLineToPoint(ctx, endX, endY);
        CGContextStrokePath(ctx);
      }
      for (int i=1; i<self.precision; i++)
      {
        
        CGFloat curAngle =(double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle;
        if ((double)i/(double)self.precision<borderValue)
        {
          CGContextSetRGBStrokeColor(ctx, 1.0, 1.0, 1.0, 1);//设置白色 不透明
          CGFloat endX,endY,startX,startY;//刻度的长度是这里 7 -2 =5;
          if (top) {
            startX = center.x -(radius-10)*cos(curAngle);
            startY = center.y - (radius-10)*sin(curAngle);
            endX = center.x - (radius-2)*cos(curAngle);//圆上的点的x坐标
            endY = center.y - (radius-2)*sin(curAngle);//圆上的点的y坐标
          }
          else
          {
            startX = center.x +(radius-10)*cos(curAngle);
            startY = center.y + (radius-10)*sin(curAngle);
            endX = center.x + (radius-2)*cos(curAngle);//圆上的点的x坐标
            endY = center.y + (radius-2)*sin(curAngle);//圆上的点的y坐标
          }
          CGContextMoveToPoint(ctx, startX, startY);
          CGContextAddLineToPoint(ctx, endX, endY);
          CGContextStrokePath(ctx);
        }
      }
    }
    - (void)didMoveToSuperview
    {
      self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(update) userInfo:nil repeats:YES];
      d_comp = self.compreValues/20;
      d_speed= self.speedValues/20;
      d_altitude=self.speedValues/20;
    }
    -(void)update
    {
      _cur_altitudeV+=d_altitude;
      _cur_speedV+=d_speed;
      _cur_compV+=d_comp;
      if (_cur_altitudeV>self.altitudeValues) {
        _cur_altitudeV =self.altitudeValues;
      }
      if (_cur_speedV > self.speedValues) {
        _cur_speedV=self.speedValues;
      }
      if (_cur_compV>self.compreValues) {
        _cur_compV=self.compreValues;
      }
      if ( _cur_compV==self.compreValues&&_cur_speedV==self.speedValues&&_cur_altitudeV ==self.altitudeValues) {
        
        [self.timer invalidate];
        self.timer = nil;
      }
      //self.backgroundColor = [UIColor colorWithRed:arc4random()%255/255.0 green:arc4random()%255/255.0 blue:arc4random()%255/255.0 alpha:1];
      [self setNeedsDisplay];
     
    }
     
    @end

    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lingkb。