拍摄圈IOS的屏幕截图

时间:2013-08-29 15:14:29

标签: ios screenshot

我正在拍摄一些UIButtons的截图,这些UIButtons是500宽度和500高度的圆圈。由于屏幕截图只能以方形形式制作,而且我没有使用此代码的图像周围的白色角落:

UIGraphicsBeginImageContext(self.Button3.layer.bounds.size);
[self.Button3.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage* image2 = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

    NSData* data = UIImagePNGRepresentation(image);
    [data writeToFile:BusinessCardPath atomically:YES];

这很完美,它只给我一张没有白角的圆圈的照片。但是它可以被放大,因为它将丢失像素,并且它不包括在镜头中所有元素,例如UILabel上方的UILabel,而不是UIButton的子视图。

如果我使用此代码:

CGSize imageSize = CGSizeMake(310, 310);

UIGraphicsBeginImageContext(self.Button3.layer.bounds.size);

CGContextRef context = UIGraphicsGetCurrentContext();
/*CGContextTranslateCTM(context, -5, -50);*/
// Iterate over every window from back to front
for (UIWindow *window in [[UIApplication sharedApplication] windows])
{
    if (![window respondsToSelector:@selector(screen)] || [window screen] == [UIScreen mainScreen])
    {
        // -renderInContext: renders in the coordinate space of the layer,
        // so we must first apply the layer's geometry to the graphics context
        CGContextSaveGState(context);
        // Center the context around the window's anchor point
        CGContextTranslateCTM(context, [window center].x, [window center].y);
        // Apply the window's transform about the anchor point
        CGContextConcatCTM(context, [window transform]);
        // Offset by the portion of the bounds left of and above the anchor point
        CGContextTranslateCTM(context,
                              -[window bounds].size.width * [[window layer] anchorPoint].x,
                              -[window bounds].size.height * [[window layer] anchorPoint].y);

        // Render the layer hierarchy to the current context
        [[window layer] renderInContext:context];

        // Restore the context
        CGContextRestoreGState(context);
    }
}

// Retrieve the screenshot image
UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

UIGraphicsEndImageContext();

......我得到了相反的效果。上面的元素包含在屏幕截图中,高分辨率,但图像周围的白色角落。

1 个答案:

答案 0 :(得分:2)

您可以使用CAShapeLayer屏蔽图像的某些部分。 .path属性用于定义将呈现的区域。

UIImageView *myImageView = [UIImageView alloc] init];
myImageView.image = [UIImage imageNamed:@"anImage.gif"];
[myImageView setClipsToBounds:YES];

UIBezierPath *maskPath = [UIBezierPath bezierPathWithRoundedRect:myImageView.bounds byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(48, 48)];
CAShapeLayer *maskLayer = [CAShapeLayer layer];
maskLayer.frame = myImageView.bounds;
maskLayer.path = maskPath.CGPath;

myImageView.layer.mask = maskLayer;

那应该给你一个圆形图像。您可能需要使用半径。