TextField神秘操作

// 禁用菜单

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender{

    if(action ==@selector(paste:))//禁止粘贴

        returnNO;

    if(action ==@selector(select:))// 禁止选择

        returnNO;

    if(action ==@selector(selectAll:))// 禁止全选

        returnNO;

    return[super canPerformAction:action withSender:sender];

}

截图为：