MBProgressHUD 添加关闭按钮

找到文件 MBProgressHUD

- (void)drawRect:(CGRect)rect {
    CGContextRef context = UIGraphicsGetCurrentContext();
    UIGraphicsPushContext(context);

    if (self.dimBackground) {
        //Gradient colours
        size_t gradLocationsNum = 2;
        CGFloat gradLocations[2] = {0.0f, 1.0f};
        CGFloat gradColors[8] = {0.0f,0.0f,0.0f,0.0f,0.0f,0.0f,0.0f,0.75f}; 
        CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
        CGGradientRef gradient = CGGradientCreateWithColorComponents(colorSpace, gradColors, gradLocations, gradLocationsNum);
        CGColorSpaceRelease(colorSpace);
        //Gradient center
        CGPoint gradCenter= CGPointMake(self.bounds.size.width/2, self.bounds.size.height/2);
        //Gradient radius
        float gradRadius = MIN(self.bounds.size.width , self.bounds.size.height) ;
        //Gradient draw
        CGContextDrawRadialGradient (context, gradient, gradCenter,
                                     0, gradCenter, gradRadius,
                                     kCGGradientDrawsAfterEndLocation);
        CGGradientRelease(gradient);
    }

    // Set background rect color
    if (self.color) {
        CGContextSetFillColorWithColor(context, self.color.CGColor);
    } else {
        CGContextSetGrayFillColor(context, 0.0f, self.opacity);
    }

    
    // Center HUD
    CGRect allRect = self.bounds;
    // Draw rounded HUD backgroud rect
    CGRect boxRect = CGRectMake(round((allRect.size.width - size.width) / 2) + self.xOffset,
                                round((allRect.size.height - size.height) / 2) + self.yOffset, size.width, size.height);
    float radius = self.cornerRadius;
    CGContextBeginPath(context);
    CGContextMoveToPoint(context, CGRectGetMinX(boxRect) + radius, CGRectGetMinY(boxRect));
    CGContextAddArc(context, CGRectGetMaxX(boxRect) - radius, CGRectGetMinY(boxRect) + radius, radius, 3 * (float)M_PI / 2, 0, 0);
    CGContextAddArc(context, CGRectGetMaxX(boxRect) - radius, CGRectGetMaxY(boxRect) - radius, radius, 0, (float)M_PI / 2, 0);
    CGContextAddArc(context, CGRectGetMinX(boxRect) + radius, CGRectGetMaxY(boxRect) - radius, radius, (float)M_PI / 2, (float)M_PI, 0);
    CGContextAddArc(context, CGRectGetMinX(boxRect) + radius, CGRectGetMinY(boxRect) + radius, radius, (float)M_PI, 3 * (float)M_PI / 2, 0);
    CGContextClosePath(context);
    CGContextFillPath(context);

    UIGraphicsPopContext();
    }

在drawRect函数最后添加：

    UIButton *view = [[UIButton alloc] initWithFrame:CGRectMake(boxRect.origin.x, boxRect.origin.y, 25, 25)];
        view.backgroundColor = UIColor.darkGrayColor;
    view.clipsToBounds = YES;
    view.layer.cornerRadius = 12.5;
    [view setTitle:@"✕" forState:UIControlStateNormal];
    [view addTarget:self action:@selector(touchToDismiss) forControlEvents:UIControlEventTouchUpInside];
    [self addSubview:view];

- (void)touchToDismiss {
    [self hide:YES];
    /// 发出通知以便后期接收处理对应的内容
    [[NSNotificationCenter defaultCenter] postNotificationName:@"cancelTask" object:nil];
}

效果图： QQ20190703-153606-HD.gif