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iOS實(shí)現(xiàn)輪盤動(dòng)態(tài)效果

 更新時(shí)間：2020年04月17日 15:42:33   作者：小白yige  
這篇文章主要為大家詳細(xì)介紹了iOS實(shí)現(xiàn)輪盤動(dòng)態(tài)效果，文中示例代碼介紹的非常詳細(xì)，具有一定的參考價(jià)值，感興趣的小伙伴們可以參考一下

本文實(shí)例為大家分享了iOS實(shí)現(xiàn)輪盤動(dòng)態(tài)效果的具體代碼，供大家參考，具體內(nèi)容如下

一個(gè)常用的繪圖，主要用來(lái)打分之類的動(dòng)畫，效果如下。

主要是iOS的繪圖和動(dòng)畫，本來(lái)想用系統(tǒng)自帶動(dòng)畫實(shí)現(xiàn)呢，發(fā)現(xiàn)實(shí)現(xiàn)不了，用了其他辦法延時(shí)并重繪視圖沒(méi)有成功，用了gcd延時(shí)，nsthread休眠，performselector delay 都不行。最后用了一個(gè)定時(shí)器實(shí)現(xiàn)類似效果，總感覺(jué)不太明智，以后應(yīng)該考慮下對(duì)CALayer和

隱式動(dòng)畫的角度考慮下

#import <UIKit/UIKit.h>
 
/**
 *  自定義變量里面以s結(jié)尾的表示具體的數(shù)值，否則表示的是表示顯示具體內(nèi)容的標(biāo)簽，以lbe的表示對(duì)內(nèi)容的說(shuō)明
 
   比如comments 表示的具體評(píng)價(jià)內(nèi)容，comment 表示評(píng)價(jià)的具體內(nèi)容，lbecomment 是一個(gè)顯示 "評(píng)價(jià)："的標(biāo)簽
 */
 
@interface ScorePlateView : UIView
 
/*速度滿意度*/
@property (nonatomic,assign) CGFloat speedValues;
 
/*態(tài)度滿意度*/
@property (nonatomic,assign) CGFloat altitudeValues;
 
/*把半圓分割的份數(shù)*/
@property (nonatomic,assign) int precision;
/**
 * 整體評(píng)價(jià)
 */
@property (nonatomic,strong) NSString * comments;
/**
 * 滿分是多少分
 */
@property (nonatomic,assign) CGFloat fullValues;
/**
 * 綜合評(píng)分
 */
@property (nonatomic,assign) CGFloat compreValues;
/**
 * 開(kāi)始角度
 */
 
@property (nonatomic,assign) CGFloat startAngle;
/**
 * 終止角度
 */
@property (nonatomic,assign) CGFloat endAngle;
 
//-(void)startAnimation;
@end
#import "ScorePlateView.h"
 
@interface ScorePlateView()
{
  CGFloat d_speed;//執(zhí)行動(dòng)畫時(shí)候每個(gè)的增量
  CGFloat d_altitude;
  CGFloat d_comp;
}
 
@property (nonatomic,strong) UILabel*lbeCompreValue;//綜合分?jǐn)?shù)的標(biāo)簽
 
@property (nonatomic,strong) UILabel *compreValue;//綜合分?jǐn)?shù)的具體數(shù)值
 
@property (nonatomic,strong) UILabel * comment;//評(píng)價(jià)
 
@property (nonatomic,assign) CGFloat cur_speedV;//當(dāng)前的值
 
@property (nonatomic,assign) CGFloat cur_altitudeV;//當(dāng)前的態(tài)度；
 
@property (nonatomic,assign) CGFloat cur_compV;//當(dāng)前的綜合分?jǐn)?shù)
@property (nonatomic,assign) NSTimer * timer;
 
@end
 
@implementation ScorePlateView
 
- (instancetype)initWithFrame:(CGRect)frame
{
  if (self = [super initWithFrame:frame]) {
    
    self.precision= 50;//這里設(shè)置默認(rèn)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 =@"真是太不可思議了";
    self.backgroundColor = [UIColor greenColor];
    _cur_compV=0;
    _cur_speedV=0;
    _cur_altitudeV=0;
  }
  return self;
}
- (void)drawRect:(CGRect)rect {
  
  //1. 畫圓
  
  CGFloat circleMargin = 0; //上下兩個(gè)半圓的間距
  CGFloat topBottomMargin =20;//這個(gè)間距用來(lái)顯示服務(wù)態(tài)度和服務(wù)速度那樣標(biāo)簽內(nèi)容
  
  CGFloat radius = (self.frame.size.height-circleMargin-2*topBottomMargin)/2;//半徑
  //上邊圓的圓心
  CGPoint centerTop = CGPointMake(self.frame.size.width/2,self.frame.size.height/2-circleMargin/2);
  [self drawHalfCircle:centerTop andWithRadius:radius isTop:YES];
  //下面圓的圓心
  CGPoint centerBottom = CGPointMake(self.frame.size.width/2, self.frame.size.height/2+circleMargin/2);
  [self drawHalfCircle:centerBottom andWithRadius:radius isTop:NO];
  
  //2. 創(chuàng)建需要的標(biāo)簽,并在合適的位置繪制內(nèi)容
  UILabel * lbeAltitude = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, topBottomMargin)];
  lbeAltitude.text = @"服務(wù)速度";
  lbeAltitude.textColor = [UIColor whiteColor];
  lbeAltitude.textAlignment = NSTextAlignmentCenter;
  lbeAltitude.font = [UIFont systemFontOfSize:12];
  [lbeAltitude drawTextInRect:lbeAltitude.frame];
  
  //服務(wù)態(tài)度評(píng)分
  UILabel * lbeSpeed = [[UILabel alloc]initWithFrame:CGRectMake(0, self.frame.size.height-topBottomMargin, self.frame.size.width, topBottomMargin)];
  lbeSpeed.text = @"服務(wù)態(tài)度";
  lbeSpeed.textColor = [UIColor whiteColor];
  lbeSpeed.textAlignment = NSTextAlignmentCenter;
  lbeSpeed.font = [UIFont systemFontOfSize:12];
  [lbeSpeed drawTextInRect:lbeSpeed.frame];
  
  //繪制綜合評(píng)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 =@"綜合評(píng)分";
  self.lbeCompreValue.textAlignment = NSTextAlignmentCenter;
  self.lbeCompreValue.textColor = [UIColor whiteColor];
  self.lbeCompreValue.font = [UIFont systemFontOfSize:14];
  [self.lbeCompreValue drawTextInRect:self.lbeCompreValue.frame];
  //評(píng)價(jià)內(nèi)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];
  
}
/**
 * 畫半圓 繪制刻度的時(shí)候可以先繪制從圓心的線，最后用一個(gè)內(nèi)圓裁剪的方式，但是如果要求背景隨時(shí)變化就局限了，特別是父視圖背景是漸變的，要么重新定義該類，要么把這個(gè)類視圖定義為透明，從而透過(guò)父視圖背景顏色
  透明的背景無(wú)法掩蓋從圓心出發(fā)的線，
 *
 * @param center 圓心坐標(biāo)
 * @param radius 半徑
 * @param top  是不是畫上面的圓
 */
-(void)drawHalfCircle:(CGPoint) center andWithRadius:(CGFloat)radius isTop:(BOOL) top
{
  
  //畫上面圓的邊框
  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);
  }
  //設(shè)置線的寬度
  CGContextSetLineWidth(ctx, 1);
  CGContextSetStrokeColorWithColor(ctx, [UIColor whiteColor].CGColor);
  CGContextStrokePath(ctx);
  //繪制上下圓的分割線
  CGContextSetLineWidth(ctx, 2);//設(shè)置線寬
  CGFloat borderValue;
  if (top) {
    borderValue=_cur_altitudeV/self.fullValues;//設(shè)置邊界值
  }
  else
  {
    borderValue =_cur_speedV/self.fullValues;
  }
  //實(shí)現(xiàn)動(dòng)畫效果，只能先畫刻度，再畫具體值
  for (int i=1; i<self.precision; i++)//畫刻度
  {
    
    CGContextSetRGBStrokeColor(ctx, 1.0, 1.0, 1.0, 0.5);//設(shè)置白色 透明
    CGFloat endX,endY,startX,startY;//刻度的長(zhǎng)度是這里 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);//圓上的點(diǎn)的x坐標(biāo)
      endY = center.y - (radius-2)*sin((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);//圓上的點(diǎn)的y坐標(biāo)
    }
    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);//圓上的點(diǎn)的x坐標(biāo)
      endY = center.y + (radius-2)*sin((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);//圓上的點(diǎn)的y坐標(biāo)
    }
    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);//設(shè)置白色 不透明
      CGFloat endX,endY,startX,startY;//刻度的長(zhǎng)度是這里 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);//圓上的點(diǎn)的x坐標(biāo)
        endY = center.y - (radius-2)*sin(curAngle);//圓上的點(diǎn)的y坐標(biāo)
      }
      else
      {
        startX = center.x +(radius-10)*cos(curAngle);
        startY = center.y + (radius-10)*sin(curAngle);
        endX = center.x + (radius-2)*cos(curAngle);//圓上的點(diǎn)的x坐標(biāo)
        endY = center.y + (radius-2)*sin(curAngle);//圓上的點(diǎn)的y坐標(biāo)
      }
      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

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