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