iOS 学习

菜单事件包括，剪切、拷贝、全选、分享...，此 demo 只有 copy、share

1.定义 field 继承与 UITextField

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender {
    if (action == @selector(copy:)) {
        return YES;
    }
    return NO;
}

- (void)copy:(id)sender {
    [self resignFirstResponder];
    //持久化，退出程序 copy 的内容还在
    [[UIPasteboard generalPasteboard]setPersistent:YES];
    //拷贝的内容
    [[UIPasteboard generalPasteboard]setValue:self.text forPasteboardType:[UIPasteboardTypeListString objectAtIndex:0]];
}

2.ViewController 加载

field = [[CCField alloc]initWithFrame:CGRectMake(100, 200, 100, 40)];
    field.backgroundColor = [UIColor greenColor];
    [self.view addSubview:field];
    
    UIMenuItem *shareItem = [[UIMenuItem alloc]initWithTitle:@"分享" action:@selector(click)];
    UIMenuController *menu = [UIMenuController sharedMenuController];
    [menu setMenuItems:[NSArray arrayWithObjects:shareItem, nil]];

3.分享的实现，以微信为例，准备工作在这里

    SendMessageToWXReq *sendReq = [[SendMessageToWXReq alloc]init];
    // 使用文本信息
    sendReq.bText = YES;
    // 发到还有列表 ， 默认是 0
    sendReq.scene = 0;
    
    sendReq.text = field.text;
    //发送分享信息
    [WXApi sendReq:sendReq];
    NSLog(@"213");

二 自定义，使用 UIMenuController

1.使 view 变成第一响应者

2.初始化 UIMenuItem 加入 UIMenuController 中

3.实现 canPerformAction: withSender: 方法

还是以复制为例

- (BOOL)canBecomeFirstResponder {
    return YES;
}

- (void)click:(UITapGestureRecognizer *)tap {
    //要显示 menu 必须将触碰的 View 设为第一响应对象
    [self.view becomeFirstResponder];
    UIMenuController *menuController = [UIMenuController sharedMenuController];
    UIMenuItem *copyItem = [[UIMenuItem alloc]initWithTitle:@"复制" action:@selector(click)];
    menuController.menuItems = @[copyItem];
    //设置 menu 的 frame和父 view
    [menuController setTargetRect:CGRectMake(_label.frame.origin.x, _label.frame.origin.y, 100, 50) inView:self.view];
    [menuController setMenuVisible:YES animated:YES];
}

完成demo 在 githud，点我查看