How to convert text to Image on iOS?

Question

I am trying to write a function to convert the textfield text to an image (example). I have tried to search for an example, most of the sample also is overwrite text on imag

Answer 1

You could try creating your own custom UIView subclass, drawing an NSString on it (your text), then converting that to a UIImage. You can draw text on a UIView only in the -drawRect: method. Here is an idea for your subclass.

@interface TextView : UIView {
    NSString *_text;
}
- (id)initWithFrame:(CGRect)frame andText:(NSString *)text;
@end

@implementation TextView
- (id)initWithFrame:(CGRect)frame andText:(NSString *)text
{
    if (self = [super initWithFrame:frame]) {
        _text = text;
    }
    [self setNeedsDisplay]; // calls the -drawRect method
    return self;
}

- (void)drawRect:(CGRect)rect
{
    [_text drawAtPoint:/* location of text*/ 
        withAttributes:/* style    of text*/];
}

More information about drawing NSStrings can be found here. Once you have this view with your text on it, convert it to a UIImage with this technique.