【IOS】IOS上实现的自定义仪表盘(可以用在流量监控之类的应用上)

【原创作品， 欢迎转载，转载请在明显处注明！ 谢谢。

原文地址：http://blog.csdn.net/toss156/article/details/7407770】

今天给大家带来一个自定义的仪表盘，效果图如下。

Demo中用到了 QuartzCore类首先继承一个UIView。

<span style="font-size: 10px;">// // Gauge.h // GaugeDemo // // Created by 海锋 周 on 12-3-27. // Copyright (c) 2012年 CJLU rights reserved. // #import <UIKit/UIKit.h> #import <QuartzCore/QuartzCore.h> @interface Gauge : UIView { UIImage *gaugeView; UIImageView *pointer; CGFloat maxNum; CGFloat minNum; CGFloat maxAngle; CGFloat minAngle; CGFloat gaugeValue; CGFloat gaugeAngle; CGFloat angleperValue; CGFloat scoleNum; NSMutableArray *labelArray; CGContextRef context; } @property (nonatomic,retain) UIImage *gaugeView; @property (nonatomic,retain) UIImageView *pointer; @property (nonatomic,retain) NSMutableArray *labelArray; @property (nonatomic) CGContextRef context; -(void)setGaugeValue:(CGFloat)value animation:(BOOL)isAnim; @end</span><span style="font-size: 14px;"> </span>

指针的旋转是通过QuartzCore.framework中的CATransform3DRotate 来实现的，所以一定要记得把框架添加进来。当然在旋转之前，我们还需要把指针的中心pointer.layer.anchorPoint 移动到你需要的转动中心。

在设置旋转动画的时候，我们用的不是CABaseAnimiation 而是用 CAKeyframeAnimation。这是因为如果使用中的 toValue 来实现旋转的话，它默认是以最小的旋转的，如果要实现控制旋转的方向的话，我们就只能用关键帧来设置旋转的路径。用关键帧的好处还有一个，就是可以给指针添加，旋转到指定位置以后的左右摆动的效果。

绘制仪表盘是通过Quartz2D来实现的，首先我们需要用UIGraphicsGetCurrentContext函数来获取一个Context上下文，就是相当于获取一个画布。然后就可以在上面通过三角函数的计算，画出背景图片，和上面的刻度线了。

// // Gauge.m // GaugeDemo // // Created by 海锋 周 on 12-3-27. // Copyright (c) 2012年 CJLU. All rights reserved. // #import "Gauge.h" #import <QuartzCore/QuartzCore.h> #define MAXOFFSETANGLE 120.0f #define POINTEROFFSET 90.0f #define MAXVALUE 120.0f #define CELLMARKNUM 5 #define CELLNUM 12 #define GAUGESTRING @"单位:Km/h" #define DEFLUATSIZE 300 /************************************************ 仪表盘的大小不建议设置的太小。 长宽都是300是最适合的 如果要更小的需要自行修改刻度长度和文字大小 ---powered by 周海锋 2012-3-29 ***********************************************/ @implementation Gauge @interface Gauge (private) - (CGFloat) parseToX:(CGFloat) radius Angle:(CGFloat)angle; - (CGFloat) parseToY:(CGFloat) radius Angle:(CGFloat)angle; - (CGFloat) transToRadian:(CGFloat)angel; - (CGFloat) parseToAngle:(CGFloat) val; - (CGFloat) parseToValue:(CGFloat) val; - (void)setTextLabel:(NSInteger)labelNum; - (void)setLineMark:(NSInteger)labelNum; - (void) pointToAngle:(CGFloat) angle Duration:(CGFloat) duration; @end @synthesize gaugeView,pointer,context; @synthesize labelArray; - (id)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { //设置背景透明 [self setBackgroundColor:[UIColor clearColor]]; scoleNum = DEFLUATSIZE/frame.size.width; maxNum = MAXVALUE; minNum = 0.0f; minAngle = -MAXOFFSETANGLE; maxAngle = MAXOFFSETANGLE; gaugeValue = 0.0f; gaugeAngle = -MAXOFFSETANGLE; angleperValue = (maxAngle - minAngle)/(maxNum - minNum); gaugeView= [UIImage imageNamed:@"gaugeback.png"]; //添加指针 UIImage *_pointer = [UIImage imageNamed:@"pointer2.png"]; pointer = [[UIImageView alloc] initWithImage:_pointer]; pointer.layer.anchorPoint = CGPointMake(0.5, 0.78); pointer.center = self.center; pointer.transform = CGAffineTransformMakeScale(scoleNum, scoleNum); [self addSubview:pointer]; //设置文字标签 [self setTextLabel:CELLNUM]; //设置指针到0位置 pointer.layer.transform = CATransform3DMakeRotation([self transToRadian:-MAXOFFSETANGLE], 0, 0, 1); } return self; } /* * setTextLabel 绘制刻度值 * @labelNum NSInteger 刻度值的数目 */ -(void)setTextLabel:(NSInteger)labelNum { labelArray = [NSMutableArray arrayWithCapacity:labelNum]; CGFloat textDis = (maxNum - minNum)/labelNum; CGFloat angelDis = (maxAngle - minAngle)/labelNum; CGFloat radius = (self.center.x - 75)*scoleNum; CGFloat currentAngle; CGFloat currentText = 0.0f; CGPoint centerPoint = self.center; for(int i=0;i<=labelNum;i++) { currentAngle = minAngle + i * angelDis - POINTEROFFSET; currentText = minNum + i * textDis; UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0 , 0 , 30, 50)]; label.autoresizesSubviews = YES; label.textColor = [UIColor whiteColor]; label.backgroundColor = [UIColor clearColor]; //设置刻度的文字的格式 if(i<labelNum/2){ label.textAlignment = UITextAlignmentLeft; }else if (i==labelNum/2){ label.textAlignment = UITextAlignmentCenter; }else{ label.textAlignment = UITextAlignmentRight; } label.text = [NSString stringWithFormat:@"%d",(int)currentText]; label.center = CGPointMake(centerPoint.x+[self parseToX:radius Angle:currentAngle],centerPoint.y+[self parseToY:radius Angle:currentAngle]); [labelArray addObject:label]; [self addSubview:label]; } // 设置刻度表的名称 UILabel *label = [[UILabel alloc]initWithFrame:CGRectMake(0 , 0 ,100, 40)]; label.autoresizesSubviews = YES; label.textColor = [UIColor whiteColor]; label.backgroundColor = [UIColor clearColor]; label.textAlignment = UITextAlignmentCenter; label.text = GAUGESTRING; label.center = CGPointMake(centerPoint.x,centerPoint.y*3/2); [self addSubview:label]; } /* * setLineMark 绘制刻度的标记 * @labelNum NSInteger 刻度是数目 */ -(void)setLineMark:(NSInteger)labelNum { CGFloat angelDis = (maxAngle - minAngle)/labelNum; CGFloat radius = self.center.x; CGFloat currentAngle; CGPoint centerPoint = CGPointMake(self.frame.size.width/2, self.frame.size.height/2); for(int i=0;i<=labelNum;i++) { currentAngle = minAngle + i * angelDis - POINTEROFFSET; //给刻度标记绘制不同的颜色 if(i>labelNum*2/3) { CGContextSetStrokeColorWithColor(context, [[UIColor colorWithRed:1 green:0 blue:0 alpha:0.8] CGColor]); }else if(i>labelNum*1/3){ CGContextSetStrokeColorWithColor(context, [[UIColor colorWithRed:1 green:1 blue:0 alpha:0.8] CGColor]); }else{ CGContextSetStrokeColorWithColor(context, [[UIColor colorWithRed:0 green:1 blue:0 alpha:0.8] CGColor]); } //绘制不同的长短的刻度 if(i%5==0) { CGContextSetLineCap(context, kCGLineCapSquare); CGContextSetLineWidth(context, 3); CGContextStrokePath(context); CGContextMoveToPoint(context,centerPoint.x+[self parseToX:radius-25*scoleNum Angle:currentAngle], centerPoint.y+[self parseToY:radius-25*scoleNum Angle:currentAngle]); CGContextAddLineToPoint(context,centerPoint.x+[self parseToX:radius-65*scoleNum Angle:currentAngle], centerPoint.y+[self parseToY:radius-65*scoleNum Angle:currentAngle]); }else{ CGContextSetLineWidth(context, 2); CGContextSetLineCap(context, kCGLineCapSquare); CGContextStrokePath(context); CGContextMoveToPoint(context,centerPoint.x+[self parseToX:radius-25*scoleNum Angle:currentAngle], centerPoint.y+[self parseToY:radius-25*scoleNum Angle:currentAngle]); CGContextAddLineToPoint(context,centerPoint.x+[self parseToX:radius-40*scoleNum Angle:currentAngle], centerPoint.y+[self parseToY:radius-40*scoleNum Angle:currentAngle]); } } } /* * setGaugeValue 移动到某个数值 * @value CGFloat 移动到的数值 * @isAnim BOOL 是否执行动画 */ -(void)setGaugeValue:(CGFloat)value animation:(BOOL)isAnim { CGFloat tempAngle = [self parseToAngle:value]; gaugeValue = value; //设置转动时间和转动动画 if(isAnim){ [self pointToAngle:tempAngle Duration:0.6f]; }else { [self pointToAngle:tempAngle Duration:0.0f]; } } /* * pointToAngle 按角度旋转 * @angel CGFloat 角度 * @duration CGFloat 动画执行时间 */ - (void) pointToAngle:(CGFloat) angle Duration:(CGFloat) duration { CAKeyframeAnimation *anim=[CAKeyframeAnimation animationWithKeyPath:@"transform"]; NSMutableArray *values=[NSMutableArray array]; anim.duration = duration; anim.autoreverses = NO; anim.fillMode = kCAFillModeForwards; anim.removedOnCompletion= NO; CGFloat distance = angle/10; //设置转动路径，不能直接用 CABaseAnimation 的toValue，那样是按最短路径的，转动超过180度时无法控制方向 int i = 1; for(;i<=10;i++){ [values addObject:[NSValue valueWithCATransform3D:CATransform3DRotate(CATransform3DIdentity, [self transToRadian:(gaugeAngle+distance*i)], 0, 0, 1)]]; } //添加缓动效果 [values addObject:[NSValue valueWithCATransform3D:CATransform3DRotate(CATransform3DIdentity, [self transToRadian:(gaugeAngle+distance*(i))], 0, 0, 1)]]; [values addObject:[NSValue valueWithCATransform3D:CATransform3DRotate(CATransform3DIdentity, [self transToRadian:(gaugeAngle+distance*(i-2))], 0, 0, 1)]]; [values addObject:[NSValue valueWithCATransform3D:CATransform3DRotate(CATransform3DIdentity, [self transToRadian:(gaugeAngle+distance*(i-1))], 0, 0, 1)]]; anim.values=values; ; [pointer.layer addAnimation:anim forKey:@"cubeIn"]; gaugeAngle = gaugeAngle+angle; } /* * parseToX 角度转弧度 * @angel CGFloat 角度 */ -(CGFloat)transToRadian:(CGFloat)angel { return angel*M_PI/180; } /* * parseToX 根据角度，半径计算X坐标 * @radius CGFloat 半径 * @angle CGFloat 角度 */ - (CGFloat) parseToX:(CGFloat) radius Angle:(CGFloat)angle { CGFloat tempRadian = [self transToRadian:angle]; return radius*cos(tempRadian); } /* * parseToY 根据角度，半径计算Y坐标 * @radius CGFloat 半径 * @angle CGFloat 角度 */ - (CGFloat) parseToY:(CGFloat) radius Angle:(CGFloat)angle { CGFloat tempRadian = [self transToRadian:angle]; return radius*sin(tempRadian); } /* * parseToAngle 根据数据计算需要转动的角度 * @val CGFloat 要移动到的数值 */ -(CGFloat) parseToAngle:(CGFloat) val { //异常的数据 if(val<minNum){ return minNum; }else if(val>maxNum){ return maxNum; } CGFloat temp =(val-gaugeValue)*angleperValue; return temp; } /* * parseToValue 根据角度计算数值 * @val CGFloat 要移动到的角度 */ -(CGFloat) parseToValue:(CGFloat) val { CGFloat temp=val/angleperValue; CGFloat temp2=maxNum/2+temp; if(temp2>maxNum){ return maxNum; }else if(temp2<maxNum){ return maxNum; } return temp2; } - (void)drawRect:(CGRect)rect { //获取上下文 context = UIGraphicsGetCurrentContext(); //设置背景透明 CGContextSetFillColorWithColor(context,self.backgroundColor.CGColor); CGContextFillRect(context, rect); //绘制仪表背景 [[self gaugeView ]drawInRect:self.bounds]; //绘制刻度 [self setLineMark:CELLNUM*CELLMARKNUM]; CGContextStrokePath(context); } @end
Demo的下载地址：http://download.csdn.net/detail/toss156/4183721