How to render UILabel at certain point in UIImage?

I'm using code found here to create an image with text that is scaled to available size:

CGFloat size = 100.0;
CGRect drawRect = CGRectMake(10, 10, 80, 25);

UILabel *myLabel = [[UILabel alloc] initWithFrame:drawRect];
myLabel.font = [UIFont fontWithName:@"HelveticaNeue-BoldItalic" size:16];
myLabel.text = "Hello text!";
myLabel.minimumScaleFactor = 0.5;
myLabel.adjustsFontSizeToFitWidth = YES;
myLabel.textAlignment = NSTextAlignmentCenter;
myLabel.backgroundColor = [UIColor clearColor];

UIGraphicsBeginImageContextWithOptions(CGSizeMake(size, size), NO, 0);
[[myLabel layer] renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

[screenshot drawInRect:drawRect];

return screenshot;

This creates a 100x100 image with the rendered label in the top-left corner: (0, 0). How do I get the text at the desired point (10, 10)?

To clarify: I want the label to be the size I specify, be centred horizontally, and its text to scale according to the available size.

Also, what is the purpose of [screenshot drawInRect:drawRect] because I seem to get the same result without it?

To answer your specific questions...

First, as to "what is the purpose of [screenshot drawInRect:drawRect]" ...

It has no purpose there.

Presumably, the post you got that from intended to say something like: "Now you have a 100 x 100 UIImage "screenshot" which you can draw into some other rect in some other graphics context."

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Second...

The label is not drawing at (10, 10) because you are rendering the label's layer -- which has an origin of (0, 0).

If you want it rendered at (10, 10) you can modify the layer's bounds before drawing it:

myLabel.backgroundColor = [UIColor clearColor];

// change the label's layer bounds
//  to the drawRect rect
myLabel.layer.bounds = drawRect;

UIGraphicsBeginImageContextWithOptions(CGSizeMake(size, size), NO, 0);

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So, if we run your code (no idea why you have two let statements):

CGFloat size = 100.0;
CGRect drawRect = CGRectMake(10, 10, 80, 25);

UILabel *myLabel = [[UILabel alloc] initWithFrame:drawRect];
myLabel.font = [UIFont fontWithName:@"HelveticaNeue-BoldItalic" size:16];
myLabel.text = "Hello text!";
myLabel.minimumScaleFactor = 0.5;
myLabel.adjustsFontSizeToFitWidth = YES;
myLabel.textAlignment = NSTextAlignmentCenter;
myLabel.backgroundColor = [UIColor clearColor];

// change the label's layer bounds
//  to match the drawRect
myLabel.layer.bounds = drawRect;

UIGraphicsBeginImageContextWithOptions(CGSizeMake(size, size), NO, 0);
[[myLabel layer] renderInContext:UIGraphicsGetCurrentContext()];
UIImage *screenshot = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

// do something with screenshot, such as
someImageView.image = screenshot;

You will now have a 100 x 100 point (not pixel) UIImage named "screenshot" with the label frame at (10, 10) (again, 10-points not pixels).

This is the result... note that the code you posted specifies a CGContextRef at the device’s main screen scale factor. I'm running this on an iPhone 14 Pro which has a @3x factor, so the output is a 300x300 pixel image, with the label frame at (30, 30) pixels:

Since it has a clear background, that's how it looks in a paint app.

If we modify the code just a little to add color to fill the image rect and the label frame, it looks like this:

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As a side-note, you might want to look into the more "modern" UIGraphicsImageRenderer