Question

我的项目是创建一个热图应用程序。为了访问以前记录的团队的热图，我需要知道如何使用图像上下文保存图纸。

- (void)drawRect
{
    CGFloat dashes[2] = {25,25};

    UIGraphicsBeginImageContext(self.field.frame.size);
    [self.field.image drawInRect:CGRectMake(0, 0, self.field.frame.size.width, self.field.frame.size.height)];
    if([_diagramselect selectedSegmentIndex]==3){
        CGContextSetLineDash(UIGraphicsGetCurrentContext(), 0,dashes, 2);
    }
    CGContextMoveToPoint(UIGraphicsGetCurrentContext(), startlocation.x-56, startlocation.y-92);
    CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), endlocation.x-56, endlocation.y-92);
    CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapSquare);
    CGContextSetLineWidth(UIGraphicsGetCurrentContext(), brush );
    CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), red, green, blue, 1.0);
    CGContextSetBlendMode(UIGraphicsGetCurrentContext(),kCGBlendModeNormal);

    CGContextStrokePath(UIGraphicsGetCurrentContext());
    self.field.image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();
}

如何保存我在场图像上绘制的内容以便以后访问？有可能吗？

Answer 1

您可以从上下文创建图片参考。

CGImageRef imageMasked = CGBitmapContextCreateImage(context);
UIImage *finalImage = [UIImage imageWithCGImage:imageMasked];

保存imageContext的内容？

1 个答案: