如何将UIImage和UILabel组合成一个图像并保存 [英] How to combine UIImage and UILabel into one image and save

问题描述

我有2个UILabel和2个图像需要合并到一个UIImage中才能保存。

I have 2 UILabels and 2 images that i need to merge into a single UIImage to save.

我知道我可以用屏幕截图来做但我的主要图像是圆形的，所以如果我直接它，它仍然会显示锋利的边缘。

I know I could do it with screen shots but my main image is rounded so if I rect it, it will still show the sharp edge.

我可以这样做来组合图像：

I can do this to combine the images :

//CGSize newImageSize = CGSizeMake(cropImage.frame.size.width, cropImage.frame.size.height);
CGSize newImageSize = CGSizeMake(480, 320);
NSLog(@"CGSize %@",NSStringFromCGSize(newImageSize));

UIGraphicsBeginImageContextWithOptions(newImageSize, NO, 0.0); //retina res
[self.viewForImg.layer renderInContext:UIGraphicsGetCurrentContext()];

UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

NSData *imgData =  UIImageJPEGRepresentation(image, 0.9); //UIImagePNGRepresentation ( image ); // get JPEG representation
UIImage * imagePNG = [UIImage imageWithData:imgData]; // wrap UIImage around PNG representation

UIGraphicsEndImageContext();
return imagePNG;

但不确定如何添加UILabel。

but not sure how to add in the UILabel.

非常感谢任何回复。

推荐答案

使用 [myLabel.layer renderInContext：UIGraphicsGetCurrentContext（ ）]; 在当前上下文中绘制。

Use [myLabel.layer renderInContext:UIGraphicsGetCurrentContext()]; to draw in current context.

例如： -

    UIGraphicsBeginImageContextWithOptions(newImageSize, NO, 0.0); //retina res
    [self.viewForImg.layer renderInContext:UIGraphicsGetCurrentContext()];
    [myLabel.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

根据您的评论，如果您想在特定的框架中绘制它，请执行以下操作，

Based on your comments, if you want to draw this in a particular frame do it as follows,

[myLabel drawTextInRect:CGRectMake(0.0f, 0.0f, 100.0f, 50.0f)];

如果你想给背景上色，试试这个，

If you want to color the background, try this,

CGRect drawRect = CGRectMake(rect.origin.x, rect.origin.y,rect.size.width, rect.size.height); 
CGContextSetRGBFillColor(context, 100.0f/255.0f, 100.0f/255.0f, 100.0f/255.0f, 1.0f); 
CGContextFillRect(context, drawRect);

或者您可以查看此问题设置CGContext透明背景。

or you can check this question Setting A CGContext Transparent Background.

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