JLPieProgressView
仿新浪微博图片加载进度条
实现代码如下：
#import "JLPieProgressView.h"
@implementation JLPieProgressView
- (void)setProgressValue:(CGFloat)progressValue{
_progressValue = progressValue;
//重绘
[self setNeedsDisplay];
}
- (void)drawRect:(CGRect)rect {
//开始角度
CGFloat startAngle = -M_PI/2;
//结束角度
CGFloat endAngle = startAngle+M_PI*2*_progressValue;
CGFloat smallRadius = 10;//内圆半径
CGFloat bigRadius = smallRadius*2+2;//外圆半径
CGContextRef ctx = UIGraphicsGetCurrentContext();
//画外圆
[[UIColor colorWithRed:1.0 green:1.0 blue:1.0 alpha:0.8] set];
CGContextAddArc(ctx, rect.size.width/2, rect.size.height/2,bigRadius,0 , M_PI*2, 0);
CGContextStrokePath(ctx);
//画内圆
CGContextSetLineWidth(ctx, smallRadius*2);
CGContextAddArc(ctx, rect.size.width/2, rect.size.height/2, smallRadius,startAngle , endAngle, 0);
CGContextStrokePath(ctx);
}
效果图
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