让 UILabel 发光并看起来明亮的最佳方法是什么？

我制作了 UILabel 显示当前时间，我希望时间（UILabel）在屏幕上发光，我尝试了通过谷歌找到的许多答案，但没有人正常工作， 需要这样,

https://i.stack.imgur.com/4REJp.png https://i.stack.imgur.com/4REJp.png

我尝试了一些想法，如下所示，

在 ViewDidLoad 中

 colorOne = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1.0];
colorTwo = [UIColor colorWithRed:0.0 green:0.0 blue:0.0 alpha:1.0];

//Create the gradient and add it to our view's root layer
gradientLayer = [[[CAGradientLayer alloc] init] autorelease];
gradientLayer.frame = CGRectMake(0.0, 0.0, 320.0, 480.0);
[gradientLayer setColors:[NSArray arrayWithObjects:(id)colorOne.CGColor,      (id)colorTwo.CGColor, nil]];
[self.view.layer insertSublayer:gradientLayer atIndex:0];

为了使背景变黑，然后我做了

CGRect rect = CGRectMake(15, 130, 320, 200);
    label = [[UILabel alloc] initWithFrame:rect];
    label.backgroundColor = [UIColor clearColor];
    dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setTimeStyle:NSDateFormatterNoStyle];
    [dateFormatter setDateStyle:NSDateFormatterMediumStyle];
    [dateFormatter setTimeZone:[NSTimeZone localTimeZone]];
    currentDateTime = [NSDate date];
    [dateFormatter setDateFormat:@"hh:mm:ss "];

    label.font=[UIFont fontWithName:@"DBLCDTempBlack" size:60.0];
    label.textColor = [UIColor colorWithRed:0.0 green:1.0 blue:0.0 alpha:1.0];

    glowOffset = CGSizeMake(10.0, 2.0);
    glowColor = label.textColor;
    glowAmount = 150.0f;
    //[self drawRect:rect];
    [self drawTextInRect:rect];

    [self.view addSubview:label];

ViewDidLoad之后

在方法drawTextInRect的主体中，我做了如下

 - (void)drawTextInRect:(CGRect)rect {

    CGContextRef context = UIGraphicsGetCurrentContext();
    CGContextSaveGState(context);

    CGContextSetShadow(context, glowOffset, glowAmount);
   CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();

   CGColorRef color = CGColorCreate(colorSpace,    CGColorGetComponents(glowColor.CGColor));
CGContextSetShadowWithColor(context, glowOffset, glowAmount, color);

  // [label drawTextInRect:rect]; 

   /*
   I can't understand this because I tried an code which was doing glow but was making     class that inheriting UILabel, then making Label from that class
   */

   CGColorRelease(color);
   CGColorSpaceRelease(colorSpace);
   CGContextRestoreGState(context);
  }

我应该怎么办 ？ 我不想继承 UILabel 并创建新类，因为当你每秒更新时它会很重，然后它会在 2 或 3 秒后更新，即使你的计时器在一秒内被调用两次，

有什么建议吗？

看看这个：务实论坛 http://forums.pragprog.com/forums/57/topics/1183#posts-8493

或者也许是这样的：堆栈溢出 https://stackoverflow.com/questions/1420131/iphone-text-glow-effect