[iOS代码] 根据文字生成图片UIImage

    CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

    CGContextRef context = CGBitmapContextCreate(NULL, dsize.width, dsize.height, 8, 4*dsize.width, colorSpace, kCGImageAlphaPremultipliedFirst);

    CGRect imageRect = CGRectMake(0, 0, dsize.width, dsize.height);

    UIColor* tColor = [[DisplayText sharedInstance] textColor];

    float tred = 0;

    float tgreen = 0;

    float tblue = 0;

    float tAlpha = 0;

    [tColor getRed:&tred green:&tgreen blue:&tblue alpha:&tAlpha];

    CGContextSetRGBFillColor(context, tred, tgreen, tblue, tAlpha);

    CGContextTranslateCTM(context, 0, imageRect.size.height);

    CGContextScaleCTM(context, 1, -1);

    UIGraphicsPushContext(context);

    UIFont* sFont = [UIFont boldSystemFontOfSize:fontSize];

    [[[DisplayText sharedInstance] displayText] drawAtPoint:CGPointMake(0, 0)

                                                   withFont:sFont];

    UIGraphicsPopContext();

    

    CGImageRef  bgRef = CGBitmapContextCreateImage(context);

CGContextRelease(context);

CGColorSpaceRelease(colorSpace);

UIImage * newBg = [UIImage imageWithCGImage:bgRef];

CGImageRelease(bgRef);