UITextView 长按弹出菜单点击删除闪退2019-06-28

创建一个继承UITextView的textView
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender

{

if(action ==@selector(copy:) ||

action ==@selector(selectAll:)||

action ==@selector(cut:)||

action ==@selector(select:)||

action ==@selector(paste:)) {

return YES;//

}

returnNO;

}
禁止长按弹出UIMenuController菜单，但是这样做的话，想要复制UITextField内容的操作也一起被禁止了：

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender {
UIMenuController *menuController = [UIMenuController sharedMenuController];
if (menuController) {
[UIMenuController sharedMenuController].menuVisible = NO;
}
return NO;
}

其中下边这些是可以访问的公开方法

• (void)cut:(nullableid)senderNS_AVAILABLE_IOS(3_0);
• (void)copy:(nullableid)senderNS_AVAILABLE_IOS(3_0);
• (void)paste:(nullableid)senderNS_AVAILABLE_IOS(3_0);
• (void)select:(nullableid)senderNS_AVAILABLE_IOS(3_0);
• (void)selectAll:(nullableid)senderNS_AVAILABLE_IOS(3_0);
• (void)delete:(nullableid)senderNS_AVAILABLE_IOS(3_2);//该方法没有实现，直接不响应好了，或者实现下方法
• (void)makeTextWritingDirectionLeftToRight:(nullableid)senderNS_AVAILABLE_IOS(5_0);
• (void)makeTextWritingDirectionRightToLeft:(nullableid)senderNS_AVAILABLE_IOS(5_0);

实现部分方法：

• (void)copy:(UIMenuController *)menu
  {
  UIPasteboard *board = [UIPasteboard generalPasteboard];
  board.string = self.text;

}

• (void)paste:(UIMenuController *)menu
  {
  UIPasteboard *board = [UIPasteboard generalPasteboard];
  self.text = board.string;
  }
• (void)cut:(UIMenuController *)menu
  {
  [self copy:menu];
  self.text = nil;
  }
• (BOOL)canBecomeFirstResponder
  {
  return YES;
  }

也可以自定义自己的MenuController
//返回YES，会调起菜单 内部可以自定义菜单UIMenuItem
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{

UIMenuController *menuControl = [UIMenuController sharedMenuController];
UIMenuItem *item = [[UIMenuItem alloc]initWithTitle:@"插入表情" action:@selector(insertFace:)];
menuControl.menuItems = @[item];

//保留系统的拷贝和粘贴菜单
if (action==@selector(insertFace:) || action == @selector(copy:) || action == @selector(paste:)) {
return YES;
}
return NO;
}

• (void)insertFace:(UIMenuController *)menu
  {
  NSLog(@"插入表情");
  }
• (void)copy:(UIMenuController *)menu
  {
  UIPasteboard *board = [UIPasteboard generalPasteboard];
  board.string = self.text;

}

• (void)paste:(UIMenuController *)menu
  {
  UIPasteboard *board = [UIPasteboard generalPasteboard];
  self.text = board.string;
  }

• (BOOL)canBecomeFirstResponder
  {
  return YES;
  }

@end