08. THTextOverlay.m

08. THTextOverlay.m

#import "THTextOverlay.h"

@implementation THTextOverlay

-(instancetype)init
{
    return [self initWithImageText:@"DEFAULT TEXT"
                              Font:[UIFont systemFontOfSize:20]
                          FontSize:20
                     TextAlignment:NSTextAlignmentLeft
              ForViewFrameToDrawIn:CGRectMake(0,0,100,100)];
}

-(instancetype)initWithImageText:(NSString *)imageText
                            Font:(UIFont *)font
                        FontSize:(CGFloat)textSize
                   TextAlignment:(NSTextAlignment)textAlignment
            ForViewFrameToDrawIn:(CGRect)viewFrameToDrawIn
{
    self = [super init];
    if (self) {
        _imageText = imageText;
        _font = font;
        _textSize = textSize;
        _viewFrameToDrawIn = viewFrameToDrawIn;
        _textAlignment = textAlignment;
    }
    return self;
}

-(UIImage *)imageFromText
{
    UIColor *textColor = [UIColor colorWithRed:1.0
                                         green:1.0
                                          blue:1.0
                                         alpha:1.0];
    
    UIFont *font = [UIFont systemFontOfSize:self.textSize];
    
    NSMutableParagraphStyle *paragraphStyle = [[NSParagraphStyle defaultParagraphStyle] mutableCopy];

    paragraphStyle.alignment = NSTextAlignmentRight;
    
    NSDictionary *attr = @{NSForegroundColorAttributeName:textColor,
                           NSFontAttributeName:font,
                           NSParagraphStyleAttributeName:paragraphStyle};
    
    CGSize thetextSize = [self.imageText sizeWithAttributes:attr];

    CGRect textRect = CGRectMake(self.viewFrameToDrawIn.origin.x, self.viewFrameToDrawIn.origin.y, thetextSize.width, thetextSize.height);
    
    // Create the image
    UIGraphicsBeginImageContextWithOptions(textRect.size , NO , 0.0f);
    CGContextClearRect(UIGraphicsGetCurrentContext(), textRect);
    
    [self.imageText drawInRect:textRect withAttributes:attr];
    
    UIImage *resultImage = UIGraphicsGetImageFromCurrentImageContext();
    
    UIGraphicsEndImageContext();
    
    return resultImage;
}

@end