How to combine UIImage and UILabel into one image

问题:

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

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.

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;

but not sure how to add in the UILabel.

Any reply is much appreciated.

回答1:

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

For eg:-

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

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)];

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);

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

回答2:

UIEdgeInsets insets = UIEdgeInsetsMake(1, 1, 1, 1);
CGSize imageSizeWithBorder = CGSizeMake(view.frame.size.width + insets.left + insets.right, view.frame.size.height + insets.top + insets.bottom);
UIGraphicsBeginImageContextWithOptions(imageSizeWithBorder, UIEdgeInsetsEqualToEdgeInsets(insets, UIEdgeInsetsZero), 0);
CGContextRef context = UIGraphicsGetCurrentContext();
CGContextClipToRect(context, (CGRect){{insets.left, insets.top}, view.frame.size});
CGContextTranslateCTM(context, -view.frame.origin.x + insets.left, -view.frame.origin.y + insets.top);
[view.layer renderInContext:context];
UIImage *viewCopy = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

Try this!

回答3:

 UIGraphicsBeginImageContextWithOptions(newImageSize, NO, scale); //retina res
        [COGI.layer renderInContext:UIGraphicsGetCurrentContext()];
        [COGI.image drawInRect:CGRectMake(0, 0, 248, 290)];
        [iconI.image drawInRect:CGRectMake(4, 20, 240, 240)];
        [stampI.image drawInRect:CGRectMake(0, -5, 248, 290)];
        [headerL drawTextInRect:CGRectMake(14, 35, 220, 40)];
        [detailL drawTextInRect:CGRectMake(16, 200, 215, 65)];

        UIImage *image = UIGraphicsGetImageFromCurrentImageContext();
        [[UIColor redColor] set]; 
        NSData *imgData =  UIImageJPEGRepresentation(image, 1.0); //UIImagePNGRepresentation ( image ); // get JPEG representation
        UIImage * imagePNG = [UIImage imageWithData:imgData]; // wrap UIImage around PNG representation

        UIGraphicsEndImageContext();
        return imagePNG;