Drawing NSString to UIImage

Question

I have a NSString object. I want to write it to existing UIImage object. UIImage object already has some image associate with it. I want to write string to same image. How do i

Answer 1

Here is my code. I have a 35x480 View and I draw text rotated by 90 degrees on it. I hope this helps. I draw the Image and then the text so it shows up. It looks like a window's window title.

I draw the image then the text on the drawRect.

@synthesize topView;
@synthesize delegate;

- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
    // Initialization code
    topView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 320, 480)];
    topView.backgroundColor = [UIColor clearColor];
    topView.opaque = NO;


    }
    return self;
}


// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    UIGraphicsBeginImageContext(img.image.size);
    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSaveGState(context);

    // draw titleborder
    CGRect titleRect = CGRectMake(0, 0, 35, 480);
    NSString *filePath = [[NSBundle mainBundle] pathForResource:@"titleborder" ofType:@"png"];  
    UIImage *titleImage = [[UIImage alloc] initWithContentsOfFile:filePath];
    [titleImage drawInRect:titleRect];
    [self bringSubviewToFront:topView];

    UIFont *font = [UIFont boldSystemFontOfSize:16.0];

    CGRect textRect = CGRectMake(0, rect.size.height/2, 480, 40);
    NSLog(@"text rect frame: %@", NSStringFromCGRect(textRect));

    [self drawText:[[NSString alloc] initWithFormat:@"My Window Title"] rect:textRect context:context font:font red:1.0 green:1.0 blue:1.0 alpha:1.0] ;

    CGContextRestoreGState(context);


}

- (void) drawText: (NSString *)text rect: (CGRect)rect context:(CGContextRef)context font:(UIFont *)font red:(CGFloat)r green: (CGFloat)g blue:(CGFloat)b alpha:(CGFloat)alpha {
    CGContextSetTextDrawingMode(context, kCGTextFill);

    CGContextSetRGBFillColor(context, r, g, b, alpha); // 6 
    CGContextSetRGBStrokeColor(context, 1, 1, 1, 1);
    CGAffineTransform transform1 = CGAffineTransformMakeRotation(-90.0 * M_PI/180.0);
    CGContextConcatCTM(context, transform1);

    CGSize sizeOfString = [text sizeWithFont:font];
    CGContextTranslateCTM(context, (sizeOfString.width/2) - 420,-232);

    [text drawInRect:rect withFont:font lineBreakMode:UILineBreakModeClip alignment:UITextAlignmentLeft];
}