非常简单，没什么好说的，直接上代码吧；

#import 
    
     IB_DESIGNABLE@interface RBButton : UIButton@property (assign, nonatomic) IBInspectable CGFloat borderWidth;@property (strong, nonatomic) IBInspectable UIColor *borderColor;@property (assign, nonatomic) IBInspectable CGFloat cornerRadius;@end#import "RBButton.h"@implementation RBButton- (void)setBorderColor:(UIColor *)borderColor {    self.layer.masksToBounds = YES;    self.layer.borderColor = borderColor.CGColor;}- (void)setBorderWidth:(CGFloat)borderWidth {    self.layer.masksToBounds = YES;    self.layer.borderWidth = borderWidth;}- (void)setCornerRadius:(CGFloat)cornerRadius {    self.layer.masksToBounds = YES;    self.layer.cornerRadius = cornerRadius;}@end
    

然后->

参考文档：