iOS帶動畫的環形進度條

本篇寫的是實現環形進度條，並帶動畫效果，要實現這些，僅能通過自己畫一個

方法直接看代碼

為了方便多次調用，用繼承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的調用並非精確，可以自行百度

  1 #import "LoopProgressView.h"
  2 #import <QuartzCore/QuartzCore.h>
  3 
  4 #define ViewWidth self.frame.size.width   //環形進度條的視圖寬度
  5 #define ProgressWidth 2.5                 //環形進度條的圓環寬度
  6 #define Radius ViewWidth/2-ProgressWidth  //環形進度條的半徑
  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     //繪製環形進度條底框
 39     CGContextAddArc(progressContext, xCenter, yCenter, Radius, 0, 2*M_PI, 0);
 40     CGContextDrawPath(progressContext, kCGPathStroke);
 41     
 42 //    //繪製環形進度環
 43     CGFloat to = self.progress * M_PI * 2; // - M_PI * 0.5為改變初始位置,此處可修改進度條的初始啟動位置
 44     
 45     // 進度數字字型大小,可自己根據自己需要，從視圖大小去適配字體字型大小，這裡就不做了
 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不會精準調用
 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 //定義動畫過程
 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

完成後在要調用的控制器里，僅需幾段代碼：傳進的參數：為0-1

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

實現後：

這裡沒有對數字和進度條做同步處理，有興趣的可以嘗試下：