CODEWITHSUNDEEP
iosxcodeuiimageuitextview
Dark Knight
Dark Knight

Reputation: 307

UITextView won't rotate

I'm adding a text label on top of a UIImage. I am successfully able to add the text label, however I would like to rotate it 90 degrees so that it's vertical.

This is the code that I have:

UIGraphicsBeginImageContext(image.size);
[image drawInRect:CGRectMake(0,0,image.size.width,image.size.height)];

UITextView *myText = [[UITextView alloc] init];
myText.font = [UIFont fontWithName:@"font-name" size:300.0f];
myText.textColor = [UIColor whiteColor];
myText.text = @"Text";
myText.backgroundColor = [UIColor clearColor];
[myText setTransform:CGAffineTransformMakeRotation(-90* M_PI/180)];

CGSize maximumLabelSize = CGSizeMake(image.size.width,image.size.height);
CGSize expectedLabelSize = [myText.text sizeWithFont:myText.font
                                   constrainedToSize:maximumLabelSize
                                       lineBreakMode:UILineBreakModeWordWrap];


myText.frame = CGRectMake(image.size.width - expectedLabelSize.width, image.size.height - expectedLabelSize.height, image.size.width, image.size.height);

[[UIColor whiteColor] set];
[myText.text drawInRect:myText.frame withFont:myText.font];
UIImage *myNewImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();

I tried transforming the Text View using this:

[myText setTransform:CGAffineTransformMakeRotation(-90* M_PI/180)];

as well as:

[myText setTransform:CGAffineTransformMakeRotation(-M_PI / 2)];

But it's not working at all, nothing happens. Would appreciate any help!

Upvotes: 1

Views: 47

Answers (1)

beyowulf
beyowulf

Reputation: 15331

You are drawing the text using [myText.text drawInRect:myText.frame withFont:myText.font]; but you are rotating the view that you are getting the text from. If you want to draw a string this way you need to rotate the context then draw. For example:

CGContextRef context = UIGraphicsGetCurrentContext();
CGContextSaveGState(context);
CGContextRotateCTM(context,-M_PI / 2);
[myText.text drawInRect:myText.frame withFont:myText.font];
CGContextRestoreGState(context);

This will essentially rotate the canvas, draw the string, then rotate the canvas back.

It is likely easier to just rotate a view with a transparent background though.

Upvotes: 2

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