进度条效果

GQScheduleView.h

@interface GQScheduleView : UIView

@property (nonatomic, strong) NSArray *textArr;

@property (nonatomic, strong) UIColor *col;

@property (nonatomic, assign) NSInteger statesNum;
@end

GQScheduleView.m

#define DEGREES_TO_RADIANS(angle) ((angle) / 180.0 * M_PI)
static CGFloat radius = 5;
static CGFloat lineWidth = 2;
static CGFloat leftSep = 30;
static CGFloat circleLabSep = 10;

@interface GQScheduleView()
@property (nonatomic, strong) NSMutableArray *labelArr;
@end

@implementation GQScheduleView
- (instancetype)initWithFrame:(CGRect)frame {
    self = [super initWithFrame:frame];
    if (self) {
        self.backgroundColor = [UIColor whiteColor];
    }
    return self;
}

- (void)drawRect:(CGRect)rect {
    CAShapeLayer *shapelayer = [self setupShapeLayerWithStrokeColor:self.col];
    [self.layer addSublayer:shapelayer];
    
    CGFloat lineW = (rect.size.width - 2 * leftSep - self.textArr.count * (2 * radius)) / (self.textArr.count - 1);
    
    CGFloat totalLength = 0.0;
    CGFloat firstLength = 0.0;
    CGFloat firstTotalTime= 0.0;
    CGFloat lastTotalTime= 0.0;
    
    UIBezierPath *path = [UIBezierPath bezierPathWithArcCenter:CGPointMake(leftSep + radius, radius)  radius:radius startAngle:-M_PI endAngle:M_PI clockwise:YES];
    path.lineWidth = lineWidth;
    
    firstLength += totalLength + (2 * radius * M_PI);
    totalLength = totalLength + (2 * radius * M_PI);
    
    // label
    [self addLabelWithText:self.textArr[0] center:CGPointMake(leftSep + radius, radius * 2 + circleLabSep)];
    
    UIBezierPath *path2 = [UIBezierPath bezierPath];
    for (NSInteger i = 0; i < self.textArr.count - 1; ++i) { // 3
        if (i + 2 <= self.statesNum) { // 0+2 > 2
            [path moveToPoint:CGPointMake(leftSep + radius * 2 + (lineW + radius * 2) * i + lineWidth, radius)];
            [path addLineToPoint:CGPointMake(leftSep + radius * 2 + lineW + (radius * 2 + lineW) * i, radius)];
            firstLength += lineW;
            totalLength += lineW;
            
            [path addArcWithCenter:CGPointMake(leftSep + radius * 2 + lineW + radius + (lineW + radius * 2) * i, radius) radius:radius startAngle:-M_PI endAngle:M_PI clockwise:YES];
            
            firstLength += (2 * radius * M_PI);
            totalLength += (2 * radius * M_PI);
        } else {
            [path2 moveToPoint:CGPointMake(leftSep + radius * 2 + (lineW + radius * 2) * i + lineWidth, radius)];
            [path2 addLineToPoint:CGPointMake(leftSep + radius * 2 + lineW + (radius * 2 + lineW) * i, radius)];
            
            totalLength += lineW;
            
            [path2 addArcWithCenter:CGPointMake(leftSep + radius * 2 + lineW + radius + (lineW + radius * 2) * i, radius) radius:radius startAngle:-M_PI endAngle:M_PI clockwise:YES];
            
            totalLength += (2 * radius * M_PI);
        }  
        [self addLabelWithText:self.textArr[i + 1] center:CGPointMake(leftSep + radius * 2 + lineW + radius  + (lineW + radius * 2) * i, radius * 2 + circleLabSep)];
        
    }
    CGFloat totalTime = self.textArr.count * 0.5;
    CGFloat perTime = totalTime / totalLength;
    
    firstTotalTime += (perTime * firstLength);
    lastTotalTime = totalTime - firstTotalTime;
    
    shapelayer.path = path.CGPath;
    
    CABasicAnimation * baseAnimation = [self setupAnimaWithDuration:firstTotalTime];
    CABasicAnimation * baseAnimation2 = [self setupAnimaWithDuration:lastTotalTime];
    
    [shapelayer addAnimation:baseAnimation forKey:@"strokeEnd"];
    
    CAShapeLayer *shapelayer2 = [self setupShapeLayerWithStrokeColor:[UIColor lightGrayColor]];
    [self.layer addSublayer:shapelayer2];
       
    [UIView animateWithDuration:perTime * (2 * radius * M_PI) delay:0 options:0 animations:^{
        UILabel *lab = self.labelArr[0];
        lab.alpha = 1;
    } completion:nil];

    for (NSInteger i = 1; i < self.labelArr.count; ++i) {
        [UIView animateWithDuration:perTime * (2 * radius * M_PI + lineW) delay:perTime * (2 * radius * M_PI) + perTime * (2 * radius * M_PI + lineW) * (i-1) options:0 animations:^{
            UILabel *lab = self.labelArr[i];
            lab.alpha = 1;
        } completion:nil];
    }
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(firstTotalTime * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        shapelayer2.path = path2.CGPath;
        [shapelayer2 addAnimation:baseAnimation2 forKey:@"strokeEnd"];
    });
}

- (CABasicAnimation * )setupAnimaWithDuration:(CGFloat)dur {
    CABasicAnimation * baseAnimation = [CABasicAnimation animationWithKeyPath:@"strokeEnd"];
    baseAnimation.fromValue = @0;
    baseAnimation.toValue = @1;
    baseAnimation.duration = dur;
    baseAnimation.repeatCount = 1;
    baseAnimation.removedOnCompletion = NO;
    baseAnimation.fillMode = kCAFillModeForwards;
    return baseAnimation;
}
- (CAShapeLayer *)setupShapeLayerWithStrokeColor:(UIColor *)strokeColor {
    CAShapeLayer *shapelayer = [CAShapeLayer layer];
    shapelayer.lineWidth = lineWidth;
    shapelayer.cornerRadius = lineWidth;
    shapelayer.lineCap = kCALineJoinRound;
    shapelayer.fillColor = [UIColor clearColor].CGColor;
    shapelayer.strokeColor = strokeColor.CGColor;
    return shapelayer;
}
- (void)addLabelWithText:(NSString *)text center:(CGPoint)center {
    UILabel *textLab = [[UILabel alloc] init];
    textLab.text = text;
    textLab.font = [UIFont systemFontOfSize:14];
    [textLab sizeToFit];
    textLab.center = center;
    [self addSubview:textLab];
    textLab.alpha = 0;
    [self.labelArr addObject:textLab];
}
- (NSMutableArray *)labelArr {
    if (_labelArr == nil) {
        _labelArr = [[NSMutableArray alloc] init];
    }
    return _labelArr;
}
@end