iOS之UIMenuController的简单使用

UIMenuController的示例

UIMenuController须知

• 默认情况下, 有以下控件已经支持UIMenuController
  
  • UITextField
  • UITextView
  • UIWebView

让其他控件也支持UIMenuController(比如UILabel)

1. 自定义UILabel

- (void)setUp {   // 1.设置label可以交互   self.userInteractionEnabled = YES;    // 2.添加点击手势   [self addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(lableClick)]];}- (void)lableClick {   // 3.设置label为第一响应者,只有成为响应者才能够将MenuController显示在其上面   [self becomeFirstResponder];   // 4.初始化UIMenuController   UIMenuController *menuController = [UIMenuController sharedMenuController];    // 5.设置UIMenuController显示的位置   // targetRect : 将要显示所在label的frame;   // view : targetRect所在的坐标系参照物(父view或self)  [menuController setTargetRect:self.frame inView:self.superview];  // [menuController setTargetRect:self.bounds inView:self];作用同上    // 6.显示UIMenuController   [menuController setMenuVisible:YES animated:YES];}

1. 在UILable内重写2个方法

/** * 让label有资格成为第一响应者 */- (BOOL)canBecomeFirstResponder{    return YES;}/** * label能执行哪些操作(比如copy, paste等等) * @return  YES:支持这种操作 */- (BOOL)canPerformAction:(SEL)action withSender:(id)sender{    if (action == @selector(cut:) || action == @selector(copy:) || action == @selector(paste:)) return YES;    return NO;}

3.实现各种操作方法

- (void)cut:(UIMenuController *)menu{    // 将自己的文字复制到粘贴板    UIPasteboard *board = [UIPasteboard generalPasteboard];    // 清空文字    self.text = nil;}- (void)copy:(UIMenuController *)menu{    // 将自己的文字复制到粘贴板    UIPasteboard *board = [UIPasteboard generalPasteboard];    board.string = self.text;}- (void)paste:(UIMenuController *)menu{    // 将粘贴板的文字 复制 到自己身上    UIPasteboard *board = [UIPasteboard generalPasteboard];    self.text = board.string;}

自定义UIMenuController内部的Item(在cell中)

• 由于手动添加的MenuItem默认触发控制器中的方法,所以将MenuController的显示/隐藏,添加MenuItem写到控制器

  1. 添加item

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {   // 点击cell弹出UIMenuController   // 1.如果menuController已经在显示,就隐藏他  // 注意,如果有一个cell正在显示menuController,这时再点击另外一个cell,上一个cell的menuController会消失,当前点击cell会显示,这是因为上一个cell不再是第一响应者了,menuController会自动释放   UIMenuController *menuController = [UIMenuController sharedMenuController];   if (menuController.isMenuVisible) {     [menuController setMenuVisible:NO animated:YES];    }else {     // 2.显示MenuController     // 先设置cell为第一响应者,同时不要忘记在cell中重写canBecomeFirstResponder和canPerformAction:withSender:     JCMTopicCommentCell *cell = [tableView cellForRowAtIndexPath:indexPath];     [cell becomeFirstResponder];     // 添加menuItem     UIMenuItem *item01 = [[UIMenuItem alloc]initWithTitle:@"赞" action:@selector(zanClick:)];     UIMenuItem *item02 = [[UIMenuItem alloc]initWithTitle:@"回复" action:@selector(responseClick:)];     UIMenuItem *item03 = [[UIMenuItem alloc]initWithTitle:@"举报" action:@selector(reportClick:)];     menuController.menuItems = @[item01,item02,item03];     // 设置menuControoler显示位置      CGRect showRect = CGRectMake(cell.x, cell.y + cell.height/2, cell.width, cell.height);      [menuController setTargetRect:showRect inView:cell.superview];     // 显示menuController [menuController setMenuVisible:YES animated:YES];    }}

1. cell中实现两个方法

/** * 让label有资格成为第一响应者 */- (BOOL)canBecomeFirstResponder{    return YES;}/** * label能执行哪些操作(比如copy, paste等等) * @return  YES:支持这种操作 */- (BOOL)canPerformAction:(SEL)action withSender:(id)sender{    if (action == @selector(cut:) || action == @selector(copy:) || action == @selector(paste:)) return YES;    return NO;}

1. 处理方法的实现

“`objc

pragma mark - MenuControllerClick

// MenuController手动添加的item的方法实现必须放在controller中
- (void)zanClick:(UIMenuController *)menu {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
NSLog(@”%s %@”, func, [self commentInIndexPath:indexPath].content);
}
- (void)responseClick:(UIMenuController *)menu {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
NSLog(@”%s %@”, func, [self commentInIndexPath:indexPath].content);
}
- (void)reportClick:(UIMenuController *)menu {
NSIndexPath *indexPath = [self.tableView indexPathForSelectedRow];
NSLog(@”%s %@”, func, [self commentInIndexPath:indexPath].content);
}“`