iOS长按UIlabel实现可复制功能

- (instancetype)initWithFrame:(CGRect)frame {
 if (self = [super initWithFrame:frame]) {
  [self pressAction];
 }
 return self;
}
// 初始化设置
- (void)pressAction {
 self.userInteractionEnabled = YES;
 UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPressAction:)];
 longPress.minimumPressDuration = 1;
 [self addGestureRecognizer:longPress];
}

 // 使label能够成为响应事件
 - (BOOL)canBecomeFirstResponder {
  return YES;
 }
 // 控制响应的方法
 - (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
  return action == @selector(customCopy:);
 }

 - (void)customCopy:(id)sender {
 UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
 pasteboard.string = self.text;
 }

- (void)longPressAction:(UIGestureRecognizer *)recognizer {
 [self becomeFirstResponder];
 UIMenuItem *copyItem = [[UIMenuItem alloc] initWithTitle:@"拷贝" action:@selector(customCopy:)];
 [[UIMenuController sharedMenuController] setMenuItems:[NSArray arrayWithObjects:copyItem, nil]];
 [[UIMenuController sharedMenuController] setTargetRect:self.frame inView:self.superview];
 [[UIMenuController sharedMenuController] setMenuVisible:YES animated:YES];
}

 - (void)cut:(nullable id)sender  NS_AVAILABLE_IOS(3_0);
 - (void)copy:(nullable id)sender  NS_AVAILABLE_IOS(3_0);
 - (void)paste:(nullable id)sender  NS_AVAILABLE_IOS(3_0);
 - (void)select:(nullable id)sender  NS_AVAILABLE_IOS(3_0);
 - (void)selectAll:(nullable id)sender  NS_AVAILABLE_IOS(3_0);
 - (void)delete:(nullable id)sender   NS_AVAILABLE_IOS(3_2);