我想知道如何将活动指示器（在 HUD 中间）添加到这个 drawrect 方法（我正在尝试创建一个带有活动的 hud）
- (void)drawRect:(CGRect)rect {
// Sets the rectangle to be 96 X 96.
const CGFloat boxWidth = 120.0f;
const CGFloat boxHeight = 120.0f;
// This method is used to calculate the position of the rectangle.
CGRect boxRect = CGRectMake( roundf(self.bounds.size.width - boxWidth) / 2.0f, roundf(self.bounds.size.height - boxHeight) / 2.0f, boxWidth,boxHeight);
// This draws the rectangle with rounded corners.
UIBezierPath *roundedRect = [UIBezierPath bezierPathWithRoundedRect:boxRect cornerRadius:10.0f];
[[UIColor colorWithWhite:0.0f alpha:0.75] setFill];
[roundedRect fill];
[[UIColor whiteColor] set]; // Sets the color of the font to white.
UIFont *font = [UIFont boldSystemFontOfSize:16.0f]; // Sets the size of the font to 16.
CGSize textSize = [self.text sizeWithFont:font];
// Calculates where to draw the text.
CGPoint textPoint = CGPointMake( self.center.x - roundf(textSize.width / 2.0f), self.center.y - roundf(textSize.height / 2.0f) + boxHeight / 4.0f);
// Draws the text on the rectangle.
[self.text drawAtPoint:textPoint withFont:font];
}
谢谢！