文本段的总体复制

Posted 2020-09-30 wzzkaifa

在做项目的时候常常遇到一些地方须要复制文本框的内容，尽管简单但还是稍做总结。

对复制的操作通常是在标签栏上（Label）。响应通常是长按手势（LongPressGesture），其它情况不做赘述。

首先声明一个方法：

- (void)copyActionWithView:(UIView *)view WithString:(NSString *)text WithSuperView:(UIView *)superView;

在标签栏上加入手势，设置可触摸属性：

_contentLabel.userInteractionEnabled = YES;
UILongPressGestureRecognizer * longPressGR = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(longPress:)];
[_contentLabel addGestureRecognizer:longPressGR];

- (void)longPress:(UILongPressGestureRecognizer *)sender{
    if (sender.state == UIGestureRecognizerStateBegan) {
        [self copyActionWithView:sender.view WithString:self.contentLabel.text WithSuperView:nil];
    }
}

实现：（一般在控制器上）

- (void)copyActionWithView:(UIView *)view WithString:(NSString *)text WithSuperView:(UIView *)superView{
    [self becomeFirstResponder];
    self.ownCopyString = text;
    UIMenuController *menu = [UIMenuController sharedMenuController];
    UIMenuItem * copy = [[UIMenuItem alloc] initWithTitle:@"复制" action:@selector(copyAction:)];
    menu.menuItems = [NSArray arrayWithObjects: copy, nil];
    CGRect targetRect;
    if (superView) {
        CGRect beginRcet = [view convertRect:view.frame toView:superView];
        CGRect minRect = [superView convertRect:superView.frame toView:superView.superview];
        CGRect endRect = [superView.superview convertRect:superView.superview.frame toView:self.view];
        targetRect.origin.y = endRect.origin.y + minRect.origin.y / 2.0 + beginRcet.origin.y / 2.0 + 8;
    }else{
        targetRect = [view convertRect:view.frame toView:self.view];
        targetRect.origin.y -= 20;
    }
    targetRect.origin.x = 110;
    targetRect.size.width = 100;
    targetRect.size.height = 17.1;
    [menu setTargetRect:targetRect inView:self.view];
    [menu setMenuVisible:YES animated:YES];
}

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

- (BOOL)canBecomeFirstResponder{
    return YES;
}

- (void)copyAction:(id)sender{
    UIPasteboard * pasteboard = [UIPasteboard generalPasteboard];
    [pasteboard setString:self.ownCopyString];
}

在通常情况下，须要复制的文本都是在较深层次的视图，一般要通过协议实现详细的方法。这里仅仅是简要说明。

另外还能够自己定义弹出点（复制小窗体）的位置。

上传一个演示样例。展示一下效果：