iOS带动画的环形进度条(进度条和数字同步)

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　　demo下载：LoopProgressViewDemo.zip

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 : UIView
4 
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

这里因为每0.01s启动一次定时器，所以要同步进度条和数字，就将self.progress赋值给动画的duration属性就可以了，duration为动画时间

在使用时我发现如果在tableviewcell中添加了这个环形进度条时有个缺点，就是定时器原本用的是系统的runloop，导致数据显示滞后，所以现更新为子线程里添加定时器，子线程的定时器必须添加

[[NSRunLoop currentRunLoop] run];才可启动定时器，因为子线程的runloop里是不带nstimer的，要手动添加运行

  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 
 16 @end
 17 
 18 @implementation LoopProgressView
 19 
 20 -(id)initWithFrame:(CGRect)frame
 21 {
 22     self = [super initWithFrame:frame];
 23     if (self) {
 24         self.backgroundColor = [UIColor clearColor];
 25     }
 26     return self;
 27 }
 28 
 29 -(void)drawRect:(CGRect)rect
 30 {
 31     _i=0;
 32     CGContextRef progressContext = UIGraphicsGetCurrentContext();
 33     CGContextSetLineWidth(progressContext, ProgressWidth);
 34     CGContextSetRGBStrokeColor(progressContext, 209.0/255.0, 209.0/255.0, 209.0/255.0, 1);
 35     
 36     CGFloat xCenter = rect.size.width * 0.5;
 37     CGFloat yCenter = rect.size.height * 0.5;
 38     
 39     //绘制环形进度条底框
 40     CGContextAddArc(progressContext, xCenter, yCenter, Radius, 0, 2*M_PI, 0);
 41     CGContextDrawPath(progressContext, kCGPathStroke);
 42     
 43     //    //绘制环形进度环
 44     CGFloat to = self.progress * M_PI * 2; // - M_PI * 0.5为改变初始位置
 45     
 46     // 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
 47     int fontNum = ViewWidth/6;
 48
 49     label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0,Radius+10, ViewWidth/6)];

 50     label.center = CGPointMake(xCenter, yCenter);

 51     label.textAlignment = NSTextAlignmentCenter;
 52     label.font = [UIFont boldSystemFontOfSize:fontNum];
 53     label.text = @"0%";
 54     [self addSubview:label];
 55     
 56     UIBezierPath *path=[UIBezierPath bezierPath];
 57     [path addArcWithCenter:CGPointMake(xCenter,yCenter) radius:Radius startAngle:0 endAngle:to clockwise:YES];
 58     arcLayer=[CAShapeLayer layer];
 59     arcLayer.path=path.CGPath;//46,169,230
 60     arcLayer.fillColor = [UIColor clearColor].CGColor;
 61     arcLayer.strokeColor=[UIColor colorWithRed:227.0/255.0 green:91.0/255.0 blue:90.0/255.0 alpha:0.7].CGColor;
 62     arcLayer.lineWidth=ProgressWidth;
 63     arcLayer.backgroundColor = [UIColor blueColor].CGColor;
 64     [self.layer addSublayer:arcLayer];
 65     
 66     
 67     dispatch_async(dispatch_get_global_queue(0, 0), ^{
 68         [self drawLineAnimation:arcLayer];
 69     });
 70     
 71     if (self.progress > 1) {
 72         NSLog(@"传入数值范围为 0-1");
 73         self.progress = 1;
 74     }else if (self.progress < 0){
 75         NSLog(@"传入数值范围为 0-1");
 76         self.progress = 0;
 77         return;
 78     }
 79     
 80     if (self.progress > 0) {
 81         NSThread *thread = [[NSThread alloc]initWithTarget:self selector:@selector(newThread) object:nil];
 82         [thread start];
 83     }
 84     
 85 }
 86 
 87 -(void)newThread
 88 {
 89     @autoreleasepool {
 90         progressTimer = [NSTimer scheduledTimerWithTimeInterval:0.01 target:self selector:@selector(timeLabel) userInfo:nil repeats:YES];
 91         [[NSRunLoop currentRunLoop] run];
 92     }
 93 }
 94 
 95 //NSTimer不会精准调用
 96 -(void)timeLabel
 97 {
 98     _i += 0.01;
 99     label.text = [NSString stringWithFormat:@"%.0f%%",_i*100];
100     
101     if (_i >= self.progress) {
102         [progressTimer invalidate];

103         progressTimer = nil;
104         
105     }
106     
107 }
108 
109 //定义动画过程
110 -(void)drawLineAnimation:(CALayer*)layer
111 {
112     CABasicAnimation *bas=[CABasicAnimation animationWithKeyPath:@"strokeEnd"];
113     bas.duration=self.progress;//动画时间
114     bas.delegate=self;
115     bas.fromValue=[NSNumber numberWithInteger:0];
116     bas.toValue=[NSNumber numberWithInteger:1];
117     [layer addAnimation:bas forKey:@"key"];
118 }
119 
120 @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：

已经实现进度条和数字的同步：