捕获UIView的UIImage卡在DrawRect方法中

Question

我试图捕捉我的UIView的图像,但当我称这种方法

- (UIImage *) imageWithView:(UIView *)view
{
    UIGraphicsBeginImageContext(view.bounds.size);
    [view.layer renderInContext:UIGraphicsGetCurrentContext()];

    UIImage * img = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return img;
}

我的应用程序在我的视图的DrawRect方法中输入并停留在这些行的循环中

[super drawRect:rect];
[curImage drawAtPoint:CGPointMake(0, 0)];
mid1 = midPoint(previousPoint1, previousPoint2);
mid2 = midPoint(currentPoint, previousPoint1);

context = UIGraphicsGetCurrentContext();

[self.layer renderInContext:context];

这是我的drawRect方法

- (void)drawRect:(CGRect)rect
{

    [super drawRect:rect];
    [curImage drawAtPoint:CGPointMake(0, 0)];
    mid1 = midPoint(previousPoint1, previousPoint2);
    mid2 = midPoint(currentPoint, previousPoint1);

    context = UIGraphicsGetCurrentContext();

    [self.layer renderInContext:context];

    CGContextMoveToPoint(context, mid1.x, mid1.y);
    CGContextAddQuadCurveToPoint(context, previousPoint1.x, previousPoint1.y, mid2.x, mid2.y);

    CGContextSetLineCap(context, kCGLineCapRound);
    CGContextSetLineWidth(context, self.lineWidth);
    CGContextSetStrokeColorWithColor(context, self.lineColor.CGColor);

    CGContextStrokePath(context);
}

Answer 1

要捕获UIView图像,只需运行以下行并检查:

    CGRect screenRect = [[UIScreen mainScreen] bounds];
    UIGraphicsBeginImageContextWithOptions(screenRect.size, NO, 0.0);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();