iOS实现轮盘动态效果

#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