本篇寫的是完成環形進度條，並帶動畫效果，要完成這些，僅能經過自己畫一個

辦法直接看代碼

為了方便屢次調用，用承繼UIView的方式

.m文件

#import <UIKit/UIKit.h>

@interface LoopProgressView : UIView

@property (nonatomic, assign) CGFloat progress;


@end

.h文件

NSTimer的調用並非准確，可以自行百度

 這裡由於每0.01s啟動一次定時器，所以要同步進度條和數字，就將self.progress賦值給動畫的duration屬性就可以了，duration為動畫時間。

 在運用時我發現假如在tableviewcell中添加了這個環形進度條時有個缺陷，就是定時器本來用的是零碎的runloop，招致數據顯示滯後，所以現更新為子線程裡添加定時器，子線程的定時器必需添加[[NSRunLoop currentRunLoop] run];才可啟動定時器，由於子線程的runloop裡是不帶nstimer的，要手動添加運轉。

#import "LoopProgressView.h"
#import <QuartzCore/QuartzCore.h>

#define ViewWidth self.frame.size.width //環形進度條的視圖寬度
#define ProgressWidth 2.5   //環形進度條的圓環寬度
#define Radius ViewWidth/2-ProgressWidth //環形進度條的半徑

@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;
 
 //繪制環形進度條底框
 CGContextAddArc(progressContext, xCenter, yCenter, Radius, 0, 2*M_PI, 0);
 CGContextDrawPath(progressContext, kCGPathStroke);
 
 // //繪制環形進度環
 CGFloat to = self.progress * M_PI * 2; // - M_PI * 0.5為改動初始地位
 
 // 進度數字字號,可自己依據自己需求，從視圖大小去適配字體字號
 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(@"傳入數值范圍為 0-1");
 self.progress = 1;
 }else if (self.progress < 0){
 NSLog(@"傳入數值范圍為 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不會精准調用
-(void)timeLabel
{
 _i += 0.01;
 label.text = [NSString stringWithFormat:@"%.0f%%",_i*100];
 
 if (_i >= self.progress) {
 [progressTimer invalidate];
 progressTimer = nil;
 
 }
 
}

//定義動畫進程
-(void)drawLineAnimation:(CALayer*)layer
{
 CABasicAnimation *bas=[CABasicAnimation animationWithKeyPath:@"strokeEnd"];
 bas.duration=self.progress;//動畫時間
 bas.delegate=self;
 bas.fromValue=[NSNumber numberWithInteger:0];
 bas.toValue=[NSNumber numberWithInteger:1];
 [layer addAnimation:bas forKey:@"key"];
}
@end

完成後在要調用的控制器裡，僅需幾段代碼：傳進的參數：為0-1

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

完成：

曾經完成進度條和數字的同步：

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