只需要把對應的空間，進行重寫。我開發的主要針對UIButton這個控件   .h文件，如下：     #import <UIKit/UIKit.h>   #import <QuartzCore/QuartzCore.h>   @interface ShadowButton : UIButton   {       UIColor *shadowColor;   }   @property(nonatomic  , strong)UIColor *shadowColor;   @end   .m文件，如下    #import "ShadowButton.h"         @implementation ShadowButton   @synthesize shadowColor;         -(void)setProperty   {       self.imageEdgeInsets = UIEdgeInsetsMake(0, -1, 3, 2);       self.shadowColor = [UIColor grayColor];   }         - (id)initWithFrame:(CGRect)frame   {       self = [super initWithFrame:frame];       if (self) {           // Initialization code       }       return self;   }         -(id)initWithCoder:(NSCoder *)aDecoder   {       self = [super initWithCoder:aDecoder];       if (self) {           [self setProperty];       }       return self;   }               // Only override drawRect: if you perform custom drawing.   // An empty implementation adversely affects performance during animation.   - (void)drawRect:(CGRect)rect   {       // Drawing code       CGContextRef context = UIGraphicsGetCurrentContext();                    CGRect frame = rect;       UIEdgeInsets insets = self.imageEdgeInsets;       frame.origin.x +=insets.left;       frame.origin.y +=insets.top;       frame.size.width -= (insets.left + insets.right);       frame.size.height -= (insets.top + insets.bottom);              if (shadowColor) {               CGContextSetShadowWithColor(context, CGSizeMake(insets.right, insets.bottom), 10, [shadowColor CGColor]);       }              UIImage *image = self.imageView.image;       [image drawInRect:frame];   }               @end