iOS 简易环形进度条
Posted 小屁孩~
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demo下载地址:https://github.com/haozheMa/LoopProgressDemo/tree/master
ViewController中的代码
#import "ViewController.h" #import "ProgressView.h" @interface ViewController () @property (strong, nonatomic) UISlider *progressSlider; @property (strong, nonatomic) ProgressView *progressView; @end @implementation ViewController - (void)viewDidLoad { [super viewDidLoad]; _progressView = [[ProgressView alloc] initWithFrame:CGRectMake([[UIScreen mainScreen] bounds].size.width/2 - 80, 100, 160, 160)]; [self.view addSubview:_progressView]; _progressSlider = [[UISlider alloc] initWithFrame:CGRectMake(self.view.frame.size.width/2-80, 400, 160, 10)]; [_progressSlider addTarget:self action:@selector(sliderChange) forControlEvents:UIControlEventValueChanged]; _progressSlider.maximumValue = 1.0; _progressSlider.minimumValue = 0.0; [self.view addSubview:_progressSlider]; } -(void)sliderChange { _progressView.percentage = _progressSlider.value; } @end
ProgressView中的代码
.h #import <UIKit/UIKit.h> @interface ProgressView : UIView @property(assign, nonatomic)CGFloat percentage; @end .m #import "ProgressView.h" @interface ProgressView () @property (strong,nonatomic) UILabel *label; @end @implementation ProgressView -(instancetype)initWithFrame:(CGRect)frame { self = [super initWithFrame:frame]; if (self) { self.percentage = 0.0; self.backgroundColor = [UIColor whiteColor]; [self loadSubviews]; } return self; } -(void)loadSubviews { _label = [[UILabel alloc] initWithFrame:CGRectMake(10, self.frame.size.height/2 - 10, self.frame.size.width - 20, 20)]; _label.textAlignment = NSTextAlignmentCenter; _label.font = [UIFont systemFontOfSize:12]; _label.textColor = [UIColor blackColor]; [self addSubview:_label]; } -(void)setPercentage:(CGFloat)percentage { _percentage = percentage; _label.text = [NSString stringWithFormat:@"%.2f%%",_percentage*100]; [self setNeedsDisplay]; } -(void)drawRect:(CGRect)rect { CGContextRef contextRef = UIGraphicsGetCurrentContext(); CGSize viewSize = self.bounds.size; CGPoint center = CGPointMake(viewSize.width/2, viewSize.height/2); CGFloat radius = viewSize.width/2; CGContextBeginPath(contextRef); CGContextMoveToPoint(contextRef, center.x, center.y); CGContextAddArc(contextRef, center.x, center.y, radius, - M_PI_2, 2*M_PI*_percentage - M_PI_2, 0); CGContextSetFillColorWithColor(contextRef, [UIColor redColor].CGColor); CGContextFillPath(contextRef); //填充圆,无边框 CGContextAddArc(contextRef, center.x, center.y, radius - 10, 0, 2*M_PI, 0); //添加一个圆 CGContextSetFillColorWithColor(contextRef, [UIColor colorWithRed:220/255.0 green:220/255.0 blue:220/255.0 alpha:1].CGColor); CGContextClosePath(contextRef); CGContextDrawPath(contextRef, kCGPathFill);//绘制填充 CGContextStrokePath(contextRef);//绘画路径 }
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