如何在iOS UIButton中添加陰影？

Question

需要專家的幫助

我在製作UIButton自定義，在這裏我裁剪的背景和顯示在UIButton如下。

[self setBackgroundImage:[self getSingleColorImageForLinear:self.frame] forState:UIControlStateSelected]; 




//Method to make take image 
-(UIImage *)getSingleColorImageForLinear:(CGRect)frame{ 


    CGSize size = CGSizeMake(frame.size.width,frame.size.height); 
    UIGraphicsBeginImageContextWithOptions(size, NO, 0); 
    CGContextRef context = UIGraphicsGetCurrentContext(); 

    CGColorSpaceRef colorspace = CGColorSpaceCreateDeviceRGB(); 

    size_t gradientNumberOfLocations = 1; 
    CGFloat gradientLocations[1] = { 0.0 }; 
    CGFloat gradientComponents[4] = { 0, 0, 0, 0.3, }; 

    CGGradientRef gradient = CGGradientCreateWithColorComponents (colorspace, gradientComponents, gradientLocations, gradientNumberOfLocations); 

    CGContextDrawLinearGradient(context, gradient, CGPointMake(0, 0), CGPointMake(0, size.height), 0); 


    UIImage *image = UIGraphicsGetImageFromCurrentImageContext(); 
    CGGradientRelease(gradient); 
    CGColorSpaceRelease(colorspace); 
    UIGraphicsEndImageContext(); 

    return image; 

} 

現在我想申請，陰影，在Adobe Photoshop看到這個圖片的屬性，

我怎麼能這樣做使用核芯顯卡或iOS庫的任何核心基礎？

的Adobe的陰影看起來如下

感謝

Answer 1

button.layer.shadowColor = [UIColor blackColor].CGColor; 
button.layer.shadowOffset = CGSizeMake(5, 5); 
button.layer.shadowRadius = 5; 
button.layer.shadowOpacity = 0.5;