添加颜色渐变

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 [self.layer addSublayer:[self shadowAsInverse]];

- (CAGradientLayer *)shadowAsInverse

{

    CAGradientLayer *newShadow = [[[CAGradientLayer alloc] init] autorelease];

    CGRect newShadowFrame =self.frame;

    newShadow.frame = newShadowFrame;

    //添加渐变的颜色组合

    newShadow.colors = [NSArray arrayWithObjects:(id)[UIColor whiteColor].CGColor,(id)[UIColor grayColor].CGColor,nil];

    return newShadow;

}

添加颜色渐变

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原文地址：http://www.cnblogs.com/woaixixi/p/4806715.html