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[操作系统]iOS带动画的环形进度条


本篇写的是实现环形进度条,并带动画效果,要实现这些,仅能通过自己画一个

方法直接看代码

为了方便多次调用,用继承UIView的方式

.m文件

1 #import <UIKit/UIKit.h>2 3 @interface LoopProgressView : UIView4 5 @property (nonatomic, assign) CGFloat progress;6 7 8 @end

 

.h文件

NSTimer的调用并非精确,可以自行百度

 1 #import "LoopProgressView.h" 2 #import <QuartzCore/QuartzCore.h> 3  4 #define ViewWidth self.frame.size.width  //环形进度条的视图宽度 5 #define ProgressWidth 2.5         //环形进度条的圆环宽度 6 #define Radius ViewWidth/2-ProgressWidth //环形进度条的半径 7  8 @interface LoopProgressView() 9 { 10   CAShapeLayer *arcLayer; 11   UILabel *label; 12   NSTimer *progressTimer; 13 } 14 @property (nonatomic,assign)CGFloat i; 15 @end 16  17 @implementation LoopProgressView 18  19 -(id)initWithFrame:(CGRect)frame 20 { 21   self = [super initWithFrame:frame]; 22   if (self) { 23     self.backgroundColor = [UIColor clearColor]; 24   } 25   return self; 26 } 27  28 -(void)drawRect:(CGRect)rect 29 { 30   _i=0; 31   CGContextRef progressContext = UIGraphicsGetCurrentContext(); 32   CGContextSetLineWidth(progressContext, ProgressWidth); 33   CGContextSetRGBStrokeColor(progressContext, 209.0/255.0, 209.0/255.0, 209.0/255.0, 1); 34    35   CGFloat xCenter = rect.size.width * 0.5; 36   CGFloat yCenter = rect.size.height * 0.5; 37  38   //绘制环形进度条底框 39   CGContextAddArc(progressContext, xCenter, yCenter, Radius, 0, 2*M_PI, 0); 40   CGContextDrawPath(progressContext, kCGPathStroke); 41    42 //  //绘制环形进度环 43   CGFloat to = self.progress * M_PI * 2; // - M_PI * 0.5为改变初始位置,此处可修改进度条的初始启动位置 44    45   // 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,这里就不做了 46   int fontNum = 15; 47    48   label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0, Radius+10, 20)]; 49   label.center = CGPointMake(xCenter, yCenter); 50   label.textAlignment = NSTextAlignmentCenter; 51   label.font = [UIFont boldSystemFontOfSize:fontNum]; 52   label.text = @"0%"; 53   [self addSubview:label]; 54    55   UIBezierPath *path=[UIBezierPath bezierPath]; 56   [path addArcWithCenter:CGPointMake(xCenter,yCenter) radius:Radius startAngle:0 endAngle:to clockwise:YES]; 57   arcLayer=[CAShapeLayer layer]; 58   arcLayer.path=path.CGPath;//46,169,230 59   arcLayer.fillColor = [UIColor clearColor].CGColor; 60   arcLayer.strokeColor=[UIColor colorWithRed:227.0/255.0 green:91.0/255.0 blue:90.0/255.0 alpha:0.7].CGColor; 61   arcLayer.lineWidth=ProgressWidth; 62   arcLayer.backgroundColor = [UIColor blueColor].CGColor; 63   [self.layer addSublayer:arcLayer]; 64    65    66   dispatch_async(dispatch_get_global_queue(0, 0), ^{ 67     [self drawLineAnimation:arcLayer]; 68   }); 69    70   if (self.progress>0) { 71     progressTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(timeLabel) userInfo:nil repeats:YES]; 72   } 73    74 } 75  76 //NSTimer不会精准调用 77 -(void)timeLabel 78 { 79   _i += 0.01; 80   label.text = [NSString stringWithFormat:@"%.0f%%",_i*100]; 81  82   if (_i>=self.progress) { 83     [progressTimer invalidate]; 84     progressTimer = nil; 85      86   } 87    88 } 89  90 //定义动画过程 91 -(void)drawLineAnimation:(CALayer*)layer 92 { 93   CABasicAnimation *bas=[CABasicAnimation animationWithKeyPath:@"strokeEnd"]; 94   bas.duration=1; 95   bas.delegate=self; 96   bas.fromValue=[NSNumber numberWithInteger:0]; 97   bas.toValue=[NSNumber numberWithInteger:1]; 98   [layer addAnimation:bas forKey:@"key"]; 99 }100 101 @end

 

 

完成后在要调用的控制器里,仅需几段代码:传进的参数:为0-1

1   LoopProgressView *custom = [[LoopProgressView alloc]initWithFrame:CGRectMake(50, 100, 100, 100)];2   custom.progress = 0.44;3   [self.view addSubview:custom];

 

实现后:

这里没有对数字和进度条做同步处理,有兴趣的可以尝试下: