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

#import <UIKit/UIKit.h>

@interface LoopProgressView : UIView

@property (nonatomic, assign) CGFloat progress;


@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

#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;
 48
 49     label = [[UILabel alloc]initWithFrame:CGRectMake(0, 0,Radius+10, ViewWidth/6)];

    label.center = CGPointMake(xCenter, yCenter);

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) {
 [progressTimer invalidate];

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

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

 

实现后：

已经实现进度条和数字的同步：