本文實例為大家分享了iOS實現輪盤動態效果的具體代碼，供大家參考，具體內容如下

一個常用的繪圖，主要用來打分之類的動畫，效果如下。

主要是iOS的繪圖和動畫，本來想用系統自帶動畫實現呢，發現實現不了，用了其他辦法延時并重繪視圖沒有成功，用了gcd延時，nsthread休眠，performselector delay 都不行。最后用了一個定時器實現類似效果，總感覺不太明智，以后應該考慮下對CALayer和

隱式動畫的角度考慮下

#import <UIKit/UIKit.h> /** * 自定義變量里面以s結尾的表示具體的數值，否則表示的是表示顯示具體內容的標簽，以lbe的表示對內容的說明 比如comments 表示的具體評價內容，comment 表示評價的具體內容，lbecomment 是一個顯示 '評價：'的標簽 */ @interface ScorePlateView : UIView /*速度滿意度*/@property (nonatomic,assign) CGFloat speedValues; /*態度滿意度*/@property (nonatomic,assign) CGFloat altitudeValues; /*把半圓分割的份數*/@property (nonatomic,assign) int precision;/** * 整體評價 */@property (nonatomic,strong) NSString * comments;/** * 滿分是多少分 */@property (nonatomic,assign) CGFloat fullValues;/** * 綜合評分 */@property (nonatomic,assign) CGFloat compreValues;/** * 開始角度 */ @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;//執行動畫時候每個的增量 CGFloat d_altitude; CGFloat d_comp;} @property (nonatomic,strong) UILabel*lbeCompreValue;//綜合分數的標簽 @property (nonatomic,strong) UILabel *compreValue;//綜合分數的具體數值 @property (nonatomic,strong) UILabel * comment;//評價 @property (nonatomic,assign) CGFloat cur_speedV;//當前的值 @property (nonatomic,assign) CGFloat cur_altitudeV;//當前的態度； @property (nonatomic,assign) CGFloat cur_compV;//當前的綜合分數@property (nonatomic,assign) NSTimer * timer; @end @implementation ScorePlateView - (instancetype)initWithFrame:(CGRect)frame{ if (self = [super initWithFrame:frame]) {self.precision= 50;//這里設置默認值; 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; //上下兩個半圓的間距 CGFloat topBottomMargin =20;//這個間距用來顯示服務態度和服務速度那樣標簽內容 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. 創建需要的標簽,并在合適的位置繪制內容 UILabel * lbeAltitude = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, self.frame.size.width, topBottomMargin)]; lbeAltitude.text = @'服務速度'; lbeAltitude.textColor = [UIColor whiteColor]; lbeAltitude.textAlignment = NSTextAlignmentCenter; lbeAltitude.font = [UIFont systemFontOfSize:12]; [lbeAltitude drawTextInRect:lbeAltitude.frame]; //服務態度評分 UILabel * lbeSpeed = [[UILabel alloc]initWithFrame:CGRectMake(0, self.frame.size.height-topBottomMargin, self.frame.size.width, topBottomMargin)]; lbeSpeed.text = @'服務態度'; lbeSpeed.textColor = [UIColor whiteColor]; lbeSpeed.textAlignment = NSTextAlignmentCenter; lbeSpeed.font = [UIFont systemFontOfSize:12]; [lbeSpeed drawTextInRect:lbeSpeed.frame]; //繪制綜合評分 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 =@'綜合評分'; self.lbeCompreValue.textAlignment = NSTextAlignmentCenter; self.lbeCompreValue.textColor = [UIColor whiteColor]; self.lbeCompreValue.font = [UIFont systemFontOfSize:14]; [self.lbeCompreValue drawTextInRect:self.lbeCompreValue.frame]; //評價內容 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 繪制刻度的時候可以先繪制從圓心的線，最后用一個內圓裁剪的方式，但是如果要求背景隨時變化就局限了，特別是父視圖背景是漸變的，要么重新定義該類，要么把這個類視圖定義為透明，從而透過父視圖背景顏色 透明的背景無法掩蓋從圓心出發的線， * * @param center 圓心坐標 * @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);//設置線寬 CGFloat borderValue; if (top) { borderValue=_cur_altitudeV/self.fullValues;//設置邊界值 } else { borderValue =_cur_speedV/self.fullValues; } //實現動畫效果，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);//設置白色 透明 CGFloat endX,endY,startX,startY;//刻度的長度是這里 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);//圓上的點的x坐標 endY = center.y - (radius-2)*sin((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);//圓上的點的y坐標 } 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);//圓上的點的x坐標 endY = center.y + (radius-2)*sin((double)i/self.precision*(self.endAngle-self.startAngle)+self.startAngle);//圓上的點的y坐標 } 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);//設置白色 不透明 CGFloat endX,endY,startX,startY;//刻度的長度是這里 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);//圓上的點的x坐標endY = center.y - (radius-2)*sin(curAngle);//圓上的點的y坐標 } else {startX = center.x +(radius-10)*cos(curAngle);startY = center.y + (radius-10)*sin(curAngle);endX = center.x + (radius-2)*cos(curAngle);//圓上的點的x坐標endY = center.y + (radius-2)*sin(curAngle);//圓上的點的y坐標 } 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內容，希望對大家的學習有所幫助，也希望大家多多支持好吧啦網。