IOS上实现的自定义仪表盘示例

原文地址::https://www.jb51.net/article/103817.htm

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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。

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// 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

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。

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// 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://xiazai.jb51.net/201701/yuanma/GaugeDemo_jb51.rar

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持脚本之家。

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原文链接：http://blog.csdn.net/toss156/article/details/7407770