ios - 如何使 setImage UIButton 上的 UIImage 更高

Question

我想要的是在 UIButton 被选中时让 UIButton 遵守 UIView 菜单。UINavigation 上的黑色方块是 UIButton 选择后的 UIImage。我的问题是选择后如何使 UIImage （黑色方块）比 UIButton 更高？

这是我在 UIButton Class .m 上的代码：

- (id)initWithFrame:(CGRect)frame {
        self = [super initWithFrame:frame];

        if (self) {
            //...Our red stretchy
            UIImage *redImage = [UIImage imageNamed:@"button_red.png"];
            UIImage *redStretchy = [redImage stretchableImageWithLeftCapWidth:redImage.size.width / 2 topCapHeight:redImage.size.height / 2];

            //...Initialization code
            [self setFrame:frame];
            [self setTitle:TITLE forState:UIControlStateNormal];
            [self setBackgroundImage:redStretchy forState:UIControlStateNormal];
            [[self titleLabel] setFont:[UIFont boldSystemFontOfSize:FONT_SIZE]];
            [[self titleLabel] setShadowOffset:CGSizeMake(FONT_SHADOW_OFFSET, FONT_SHADOW_OFFSET)];

            //...add target
            [self addTarget:self action:@selector(actionButton:) forControlEvents:UIControlEventTouchUpInside];
        }

        return self;
    }

这是目标方法：

    //...add target
- (void)actionButton:(id)sender {

    if ([sender isSelected]) {

    } else {

        CGSize buttonSize = CGSizeMake(self.frame.size.width, self.frame.size.height);

        [sender setImage:[self imageButton:buttonSize] forState:UIControlStateSelected];

    }

    if (delegate != nil && [delegate conformsToProtocol:@protocol(ButtonProtocol)]) {
        if ([delegate respondsToSelector:@selector(actionButton:)]) {
            [delegate performSelector:@selector(actionButton:) withObject:sender];
        }
    }

}

这个方法创建 UIIMage：

    //...create image button
- (UIImage *)imageButton:(CGSize)size {

    UIGraphicsBeginImageContextWithOptions(size, NO, 0);

    CGContextRef currentContex = UIGraphicsGetCurrentContext();

    CGMutablePathRef path = CGPathCreateMutable();

    CGRect firstRect = CGRectMake(0.0f, 0.0f, 60.f, 30.0f);

    CGPathAddRect(path, NULL, firstRect);

    CGContextAddPath(currentContex, path);

    UIColor *fillColor = [UIColor blackColor];

    CGContextSetFillColorWithColor(currentContex, fillColor.CGColor);

    CGContextDrawPath(currentContex, kCGPathFill);

    UIImage *image = UIGraphicsGetImageFromCurrentImageContext();

    UIGraphicsEndImageContext();

    return image;
}