Can't set font for drawInRect - ios

Question

I'm trying to draw text on a context, and it works.
I'm trying to set an UIfont to this text but it doesn't work. The text size remain the same.
Here my code
- (UIImage *)imageByDrawingCircleOnImage:(UIImage *)image
{
UIGraphicsBeginImageContextWithOptions((image.size), NO, [[UIScreen mainScreen]scale] );
[image drawAtPoint:CGPointZero];
CGContextRef context = UIGraphicsGetCurrentContext();
UIFont *font = [UIFont systemFontOfSize:30];;//[UIFont fontWithName: #"Helvetica" size:45.0];
CGContextSetRGBStrokeColor(context, 210.0/255.0f, 0.0f, 0.0f, 1.0f);
CGContextSetRGBFillColor(context, 192.0/255.0, 0.0/255.0 , 13.0/255.0, 1.0);
NSMutableParagraphStyle *textStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
textStyle.lineBreakMode = NSLineBreakByWordWrapping;
textStyle.alignment = NSTextAlignmentRight;
NSMutableDictionary *attributes = [NSMutableDictionary dictionary];
[attributes setObject:textStyle forKey:#"NSParagraphStyleAttributeName"];
[attributes setObject:font forKey:#"NSFontAttributeName"];
NSString *string = #"Tour de poitrine : 95 cm";
CGSize string_len =[string sizeWithAttributes:attributes];
[string drawInRect:CGRectMake(245 - string_len.width, 100.0, string_len.width , 100) withAttributes:[NSDictionary dictionaryWithDictionary:attributes]];
UIImage *retImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return retImage;
}
Thanks
Alexandre

Answer 1

Do not use strings for your attributes dictionary keys, use the constants provided by the framework.
Replace #"NSFontAttributeName" by NSFontAttributeName and #"NSParagraphStyleAttributeName" by NSParagraphStyleAttributeName.

Answer 2

Replace your code by this. It's working for me.
- (UIImage *)imageByDrawingCircleOnImage:(UIImage *)image
{
UIGraphicsBeginImageContextWithOptions((image.size), NO, [[UIScreen mainScreen]scale] );
[image drawAtPoint:CGPointZero];
CGContextRef context = UIGraphicsGetCurrentContext();
UIFont *font = [UIFont fontWithName: #"Chalkduster" size:20.0];
CGContextSetRGBStrokeColor(context, 210.0/255.0f, 0.0f, 0.0f, 1.0f);
CGContextSetRGBFillColor(context, 192.0/255.0, 0.0/255.0 , 13.0/255.0, 1.0);
NSMutableParagraphStyle *textStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];
textStyle.lineBreakMode = NSLineBreakByWordWrapping;
textStyle.alignment = NSTextAlignmentRight;
NSString *string = #"Tour de poitrine : 95 cm";
NSDictionary* attributes = #{NSFontAttributeName: font,
NSForegroundColorAttributeName: [UIColor redColor],
NSParagraphStyleAttributeName: textStyle
};
CGSize string_len =[string sizeWithAttributes:attributes];
[string drawInRect:CGRectMake(245 - string_len.width, 100.0, string_len.width , 100) withAttributes:[NSDictionary dictionaryWithDictionary:attributes]];
UIImage *retImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
return retImage;
}

Answer 3

Try this:
//// General Declarations
CGContextRef context = UIGraphicsGetCurrentContext();
//// Text Drawing
CGRect textRect = CGRectMake(CGRectGetMinX(frame) + 23, CGRectGetMinY(frame) + 28, 101, 27);
{
NSString* textContent = #"Hello, World!";
NSMutableParagraphStyle* textStyle = NSMutableParagraphStyle.defaultParagraphStyle.mutableCopy;
textStyle.alignment = NSTextAlignmentLeft;
NSDictionary* textFontAttributes = #{NSFontAttributeName: [UIFont systemFontOfSize: UIFont.labelFontSize], NSForegroundColorAttributeName: UIColor.blackColor, NSParagraphStyleAttributeName: textStyle};
CGFloat textTextHeight = [textContent boundingRectWithSize: CGSizeMake(textRect.size.width, INFINITY) options: NSStringDrawingUsesLineFragmentOrigin attributes: textFontAttributes context: nil].size.height;
CGContextSaveGState(context);
CGContextClipToRect(context, textRect);
[textContent drawInRect: CGRectMake(CGRectGetMinX(textRect), CGRectGetMinY(textRect) + (CGRectGetHeight(textRect) - textTextHeight) / 2, CGRectGetWidth(textRect), textTextHeight) withAttributes: textFontAttributes];
CGContextRestoreGState(context);
}