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

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