废话不多说，直接上代码 --

//保护左右侧，中间1像素进行mode

UIImage * imageProtectLeftRight(UIImage *image, UIImageResizingMode mode)

{

    CGFloat top = 0;

    CGFloat bottom = 0;

    CGFloat left = image.size.width*0.5-1;

    CGFloat right = image.size.width*0.5-1;

    UIEdgeInsets insets = UIEdgeInsetsMake(top, left, bottom, right);

    UIImage *img = [image resizableImageWithCapInsets:insets resizingMode:mode];

    return img;

}

//保护上下侧，中间1像素进行mode

UIImage * imageProtectTopBottom(UIImage *image, UIImageResizingMode mode)

{

    CGFloat top = image.size.height*0.5-1;

    CGFloat bottom = image.size.height*0.5-1;

    CGFloat left = 0;

    CGFloat right = 0;

    UIEdgeInsets insets = UIEdgeInsetsMake(top, left, bottom, right);

    UIImage *img = [image resizableImageWithCapInsets:insets resizingMode:mode];

    return img;

}

//保护上下左右侧，中间1像素进行mode

UIImage * imageProtect(UIImage *image, UIImageResizingMode mode)

{

    CGFloat top = image.size.height*0.5-0.5;

    CGFloat bottom = image.size.height*0.5-0.5;

    CGFloat left = image.size.width*0.5-0.5;

    CGFloat right = image.size.width*0.5-0.5;

    UIEdgeInsets insets = UIEdgeInsetsMake(top, left, bottom, right);

    UIImage *img = [image resizableImageWithCapInsets:insets resizingMode:mode];

    return img;

}