iOS实现带动画的环形进度条

#import <UIKit/UIKit.h>@interface LoopProgressView : UIView@property (nonatomic, assign) CGFloat progress;@end

#import "LoopProgressView.h"#import <QuartzCore/QuartzCore.h>#define ViewWidth self.frame.size.width //环形进度条的视图宽度#define ProgressWidth 2.5   //环形进度条的圆环宽度#define Radius ViewWidth/2-ProgressWidth //环形进度条的半径@interface LoopProgressView(){ CAShapeLayer *arcLayer; UILabel *label; NSTimer *progressTimer;}@property (nonatomic,assign)CGFloat i;@end@implementation LoopProgressView-(id)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { self.backgroundColor = [UIColor clearColor]; } return self;}-(void)drawRect:(CGRect)rect{ _i=0; CGContextRef progressContext = UIGraphicsGetCurrentContext(); CGContextSetLineWidth(progressContext, ProgressWidth); CGContextSetRGBStrokeColor(progressContext, 209.0/255.0, 209.0/255.0, 209.0/255.0, 1);  CGFloat xCenter = rect.size.width * 0.5; CGFloat yCenter = rect.size.height * 0.5;  //绘制环形进度条底框 CGContextAddArc(progressContext, xCenter, yCenter, Radius, 0, 2*M_PI, 0); CGContextDrawPath(progressContext, kCGPathStroke);  // //绘制环形进度环 CGFloat to = self.progress * M_PI * 2; // - M_PI * 0.5为改变初始位置  // 进度数字字号,可自己根据自己需要，从视图大小去适配字体字号 int fontNum = ViewWidth/6; 49 label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0,Radius+10, ViewWidth/6)]; label.center = CGPointMake(xCenter, yCenter); label.textAlignment = NSTextAlignmentCenter; label.font = [UIFont boldSystemFontOfSize:fontNum]; label.text = @"0%"; [self addSubview:label];  UIBezierPath *path=[UIBezierPath bezierPath]; [path addArcWithCenter:CGPointMake(xCenter,yCenter) radius:Radius startAngle:0 endAngle:to clockwise:YES]; arcLayer=[CAShapeLayer layer]; arcLayer.path=path.CGPath;//46,169,230 arcLayer.fillColor = [UIColor clearColor].CGColor; arcLayer.strokeColor=[UIColor colorWithRed:227.0/255.0 green:91.0/255.0 blue:90.0/255.0 alpha:0.7].CGColor; arcLayer.lineWidth=ProgressWidth; arcLayer.backgroundColor = [UIColor blueColor].CGColor; [self.layer addSublayer:arcLayer];   dispatch_async(dispatch_get_global_queue(0, 0), ^{ [self drawLineAnimation:arcLayer]; });  if (self.progress > 1) { NSLog(@"传入数值范围为 0-1"); self.progress = 1; }else if (self.progress < 0){ NSLog(@"传入数值范围为 0-1"); self.progress = 0; return; }  if (self.progress > 0) { NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(newThread) object:nil]; [thread start]; } }-(void)newThread{ @autoreleasepool { progressTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(timeLabel) userInfo:nil repeats:YES]; [[NSRunLoop currentRunLoop] run]; }}//NSTimer不会精准调用-(void)timeLabel{ _i += 0.01; label.text = [NSString stringWithFormat:@"%.0f%%",_i*100];  if (_i >= self.progress) { [progressTimer invalidate]; progressTimer = nil;  } }//定义动画过程-(void)drawLineAnimation:(CALayer*)layer{ CABasicAnimation *bas=[CABasicAnimation animationWithKeyPath:@"strokeEnd"]; bas.duration=self.progress;//动画时间 bas.delegate=self; bas.fromValue=[NSNumber numberWithInteger:0]; bas.toValue=[NSNumber numberWithInteger:1]; [layer addAnimation:bas forKey:@"key"];}@end

 LoopProgressView *custom = [[LoopProgressView alloc]initWithFrame:CGRectMake(50, 100, 100, 100)]; custom.progress = 0.44; [self.view addSubview:custom];