iOS学习-圆形进度条

效果：

#import <UIKit/UIKit.h>

@interface HsProfitRatePieWidgets : UIView
{
    UILabel *_textLabel;
}

@property (nonatomic) double progress;

@property (nonatomic) NSInteger showText UI_APPEARANCE_SELECTOR;
@property (nonatomic) NSInteger roundedHead UI_APPEARANCE_SELECTOR;
@property (nonatomic) NSInteger showShadow UI_APPEARANCE_SELECTOR;

@property (nonatomic) CGFloat thicknessRatio UI_APPEARANCE_SELECTOR;

@property (nonatomic, strong) UIColor *innerBackgroundColor UI_APPEARANCE_SELECTOR;
@property (nonatomic, strong) UIColor *outerBackgroundColor UI_APPEARANCE_SELECTOR;

@property (nonatomic, strong) UIFont *font UI_APPEARANCE_SELECTOR;

@property (nonatomic, strong) UIColor *progressFillColor UI_APPEARANCE_SELECTOR;

@property (nonatomic, strong) UIColor *progressTopGradientColor UI_APPEARANCE_SELECTOR;
@property (nonatomic, strong) UIColor *progressBottomGradientColor UI_APPEARANCE_SELECTOR;

@end

.m实现文件中

#import "HsProfitRatePieWidgets.h"

#define DEGREES_TO_RADIANS(angle) ((angle) / 180.0 * M_PI)

@implementation HsProfitRatePieWidgets

- (void)dealloc
{
    [_textLabel release];
    [super dealloc];
}

+ (void)initialize
{
    if (self == [HsProfitRatePieWidgets class])
    {
        id appearance = [self appearance];

        [appearance setShowText:YES];//用来控制是否显示显示label
        [appearance setRoundedHead:YES];//用来控制是否对进度两边进行处理
        [appearance setShowShadow:YES];//控制圆环进度条的样式

        [appearance setThicknessRatio:0.37f];//圆环进度条的宽度

        [appearance setInnerBackgroundColor:nil];
        [appearance setOuterBackgroundColor:nil];

        [appearance setProgressFillColor:[UIColor redColor]];//整个进度条颜色
        [appearance setProgressTopGradientColor:[UIColor greenColor]];//进度条前半部分颜色
        [appearance setProgressBottomGradientColor:[UIColor redColor]];//进度条后半部分颜色
        [appearance setBackgroundColor:[UIColor clearColor]];
    }
}

- (id)init
{
    self = [super initWithFrame:CGRectMake(0.0f, 0.0f, 44.0f, 44.0f)];

    return self;
}

#pragma mark - Drawing

- (void)drawRect:(CGRect)rect
{
    // Calculate position of the circle
    CGFloat progressAngle = _progress * 360.0 - ;
    CGPoint center = CGPointMake(rect.size.width / 2.0f, rect.size.height / 2.0f);
    CGFloat radius = MIN(rect.size.width, rect.size.height) / 2.0f;

    CGRect square;
    if (rect.size.width > rect.size.height)
    {
        square = CGRectMake((rect.size.width - rect.size.height) / 2.0, 0.0, rect.size.height, rect.size.height);
    }
    else
    {
        square = CGRectMake(0.0, (rect.size.height - rect.size.width) / 2.0, rect.size.width, rect.size.width);
    }

    //进度条宽度
    CGFloat circleWidth = radius * _thicknessRatio;
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSaveGState(context);

    if (_innerBackgroundColor)
    {
        //内环
        // Fill innerCircle with innerBackgroundColor
        UIBezierPath *innerCircle = [UIBezierPath bezierPathWithArcCenter:center
                                                                   radius:radius - circleWidth
                                                               startAngle:*M_PI
                                                                 endAngle:0.0
                                                                clockwise:YES];

        [_innerBackgroundColor setFill];

        [innerCircle fill];
    }

    if (_outerBackgroundColor)
    {
        //外环
        // Fill outerCircle with outerBackgroundColor
        UIBezierPath *outerCircle = [UIBezierPath bezierPathWithArcCenter:center
                                                                   radius:radius
                                                               startAngle:0.0
                                                                 endAngle:*M_PI
                                                                clockwise:NO];
        [outerCircle addArcWithCenter:center
                               radius:radius - circleWidth
                           startAngle:*M_PI
                             endAngle:0.0
                            clockwise:YES];

        [_outerBackgroundColor setFill];

        [outerCircle fill];
    }

    if (_showShadow)
    {
        //圆环背景处理
        CGFloat locations[] = { 0.0f, 0.33f, 0.66f, 1.0f };
//        NSArray *gradientColors = @[
//                                    (id)[[UIColor colorWithWhite:0.3 alpha:0.5] CGColor],
//                                    (id)[[UIColor colorWithWhite:0.9 alpha:0.0] CGColor],
//                                    (id)[[UIColor colorWithWhite:0.9 alpha:0.0] CGColor],
//                                    (id)[[UIColor colorWithWhite:0.3 alpha:0.5] CGColor],
//                                    ];

        NSArray *gradientColors = @[
                                    (id)[[UIColor colorWithWhite:0.7 alpha:] CGColor],
                                    (id)[[UIColor colorWithWhite:0.7 alpha:] CGColor],
                                    (id)[[UIColor colorWithWhite:0.7 alpha:] CGColor],
                                    (id)[[UIColor colorWithWhite:0.7 alpha:] CGColor],
                                    ];

        CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
        CGGradientRef gradient = CGGradientCreateWithColors(rgb, (__bridge CFArrayRef)gradientColors, locations);
        CGContextDrawRadialGradient(context, gradient, center, radius - circleWidth, center, radius, );
        CGGradientRelease(gradient);
        CGColorSpaceRelease(rgb);
    }

    if (_showText)
    {
        if (!_progress) {
            return;
        }
        if ([self viewWithTag:]) {
            [_textLabel removeFromSuperview];
        }
        //中间显示label
        _textLabel = [[[UILabel alloc] init] autorelease];
        //字符串处理
        NSString *str = [NSString stringWithFormat:@"%0.2f%%\n收益率",_progress * 100.0];
        NSMutableAttributedString *progressStr = [[NSMutableAttributedString alloc] initWithString:str];
        //前6位字符  颜色
        [progressStr addAttribute:NSForegroundColorAttributeName value:[UIColor redColor] range:NSMakeRange(, )];
        //第七位向后的3个字符 颜色
        [progressStr addAttribute:NSForegroundColorAttributeName value:[UIColor blackColor] range:NSMakeRange(, )];
        [progressStr addAttribute:NSFontAttributeName value:[UIFont boldSystemFontOfSize:16.0] range:NSMakeRange(, )];
        [progressStr addAttribute:NSFontAttributeName value:[UIFont systemFontOfSize:] range:NSMakeRange(, )];
        _textLabel.attributedText = progressStr;
        _textLabel.numberOfLines = ;
        _textLabel.bounds = CGRectMake(, , , );
        _textLabel.center = CGPointMake(self.bounds.size.width/2.0, self.bounds.size.height/2.0);
        _textLabel.tag = ;
        _textLabel.textAlignment = NSTextAlignmentCenter;
        [self addSubview:_textLabel];

    }

    UIBezierPath *path = [UIBezierPath bezierPath];

    [path appendPath:[UIBezierPath bezierPathWithArcCenter:center
                                                    radius:radius
                                                startAngle:DEGREES_TO_RADIANS(-)
                                                  endAngle:DEGREES_TO_RADIANS(progressAngle)
                                                 clockwise:YES]];

    if (_roundedHead)
    {
        //终点处理
        CGPoint point;
        point.x = (cos(DEGREES_TO_RADIANS(progressAngle)) * (radius - circleWidth/)) + center.x;
        point.y = (sin(DEGREES_TO_RADIANS(progressAngle)) * (radius - circleWidth/)) + center.y;

        [path addArcWithCenter:point
                        radius:circleWidth/
                    startAngle:DEGREES_TO_RADIANS(progressAngle)
                      endAngle:DEGREES_TO_RADIANS(270.0 + progressAngle - 90.0)
                     clockwise:YES];
    }

    [path addArcWithCenter:center
                    radius:radius-circleWidth
                startAngle:DEGREES_TO_RADIANS(progressAngle)
                  endAngle:DEGREES_TO_RADIANS(-)
                 clockwise:NO];
    //起始点添加分割线
    UIView *lineView = [[UIView alloc] initWithFrame:CGRectMake(radius, , , circleWidth)];
    lineView.backgroundColor = [UIColor whiteColor];
    [self addSubview:lineView];

    if (_roundedHead)
    {
        //起始点处理
//        CGPoint point;
//        point.x = (cos(DEGREES_TO_RADIANS(-90)) * (radius - circleWidth/2)) + center.x;
//        point.y = (sin(DEGREES_TO_RADIANS(-90)) * (radius - circleWidth/2)) + center.y;
//
//        [path addArcWithCenter:point
//                        radius:circleWidth/2
//                    startAngle:DEGREES_TO_RADIANS(90)
//                      endAngle:DEGREES_TO_RADIANS(-90)
//                     clockwise:NO];
    }

    [path closePath];
    //进度条颜色处理
    if (_progressFillColor)
    {
        [_progressFillColor setFill];
        [path fill];
    }
    else if (_progressTopGradientColor && _progressBottomGradientColor)
    {
        [path addClip];

        NSArray *backgroundColors = @[
                                      (id)[_progressTopGradientColor CGColor],
                                      (id)[_progressBottomGradientColor CGColor],
                                      ];
        CGFloat backgroudColorLocations[] = { 0.0f, 1.0f };
        CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
        CGGradientRef backgroundGradient = CGGradientCreateWithColors(rgb, (__bridge CFArrayRef)(backgroundColors), backgroudColorLocations);
        CGContextDrawLinearGradient(context,
                                    backgroundGradient,
                                    CGPointMake(0.0f, square.origin.y),
                                    CGPointMake(0.0f, square.size.height),
                                    );
        CGGradientRelease(backgroundGradient);
        CGColorSpaceRelease(rgb);
    }

    CGContextRestoreGState(context);
}

#pragma mark - Setter
//设置进度
- (void)setProgress:(double)progress
{
    _progress = MIN(1.0, MAX(0.0, progress));

    [self setNeedsDisplay];
}

#pragma mark - UIAppearance

- (void)setShowText:(NSInteger)showText
{
    _showText = showText;

    [self setNeedsDisplay];
}

- (void)setRoundedHead:(NSInteger)roundedHead
{
    _roundedHead = roundedHead;

    [self setNeedsDisplay];
}

- (void)setShowShadow:(NSInteger)showShadow
{
    _showShadow = showShadow;

    [self setNeedsDisplay];
}
//进度条宽度与半径之比
- (void)setThicknessRatio:(CGFloat)thickness
{
    _thicknessRatio = MIN(MAX(0.0f, thickness), 1.0f);

    [self setNeedsDisplay];
}
//内环
- (void)setInnerBackgroundColor:(UIColor *)innerBackgroundColor
{
    _innerBackgroundColor = innerBackgroundColor;

    [self setNeedsDisplay];
}
//外环
- (void)setOuterBackgroundColor:(UIColor *)outerBackgroundColor
{
    _outerBackgroundColor = outerBackgroundColor;

    [self setNeedsDisplay];
}
//进度条颜色
- (void)setProgressFillColor:(UIColor *)progressFillColor
{
    _progressFillColor = progressFillColor;

    [self setNeedsDisplay];
}
//进度条前半部分颜色
- (void)setProgressTopGradientColor:(UIColor *)progressTopGradientColor
{
    _progressTopGradientColor = progressTopGradientColor;

    [self setNeedsDisplay];
}
//进度条后半部分颜色
- (void)setProgressBottomGradientColor:(UIColor *)progressBottomGradientColor
{
    _progressBottomGradientColor = progressBottomGradientColor;

    [self setNeedsDisplay];
}

@end

展现：

- (void)viewDidLoad {
    [super viewDidLoad];
    HsProfitRatePieWidgets *circleProgress = [[HsProfitRatePieWidgets alloc] initWithFrame:CGRectMake(, , , )];
    circleProgress.progress = 0.432;
    [self.view addSubview:circleProgress];
    [circleProgress release];
}