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[操作系统]iOS空心圆下载进度指示器控件


self.layer = [CAShapeLayer layer];  self.layer.frame = CGRectMake(0, 0, 100, 100);  self.layer.position = self.view.center;  self.layer.lineWidth = 10.0;  self.layer.fillColor = [UIColor clearColor].CGColor;  self.layer.strokeColor = [UIColor lightGrayColor].CGColor;  self.layer.lineCap = kCALineCapSquare;  /*   CA_EXTERN NSString *const kCALineCapButt   __OSX_AVAILABLE_STARTING (__MAC_10_6, __IPHONE_3_0);   CA_EXTERN NSString *const kCALineCapRound   __OSX_AVAILABLE_STARTING (__MAC_10_6, __IPHONE_3_0);   CA_EXTERN NSString *const kCALineCapSquare   */  UIBezierPath *path = [UIBezierPath bezierPathWithOvalInRect:CGRectMake(0, 0, 100, 100)];  self.layer.path = path.CGPath;  [self.view.layer addSublayer:self.layer];  self.layer.strokeEnd = 0.0;  _progress = 0;  self.timer = [NSTimer scheduledTimerWithTimeInterval:0.1 target:self selector:@selector(updateProgress) userInfo:nil repeats:YES];//更新下载进度_progress += 0.01;  if (self.layer.strokeEnd >= 1) {    self.timer.fireDate = [NSDate distantFuture];  }  else  {    self.layer.strokeEnd = _progress;  }