允许用户从UILabel中选择要复制的文本[复制]

这是不可能的 UILabel

你应该用 UITextField 为了这个。只是禁用编辑使用 textFieldShouldBeginEditing 委托方法。

使用create a UITextView并使其 .editable

一个穷人版本的复制粘贴,如果你不能,或不需要使用文本视图,将是添加一个手势识别器到标签,然后只是复制整个文本到粘贴板。如果不使用 UITextView

确保你让用户知道它已经被复制了,并且你同时支持一个点击手势和一个长按,因为它会让用户尝试突出显示文本的一部分。下面是一些示例代码:

创建时在标签上注册手势识别器:

UITapGestureRecognizer *tap = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(textTapped:)];
UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(textPressed:)];
                [myLabel addGestureRecognizer:tap];
                [myLabel addGestureRecognizer:longPress];
                [myLabel setUserInteractionEnabled:YES];

接下来处理手势:

- (void) textPressed:(UILongPressGestureRecognizer *) gestureRecognizer {
    if (gestureRecognizer.state == UIGestureRecognizerStateRecognized &&
        [gestureRecognizer.view isKindOfClass:[UILabel class]]) {
        UILabel *someLabel = (UILabel *)gestureRecognizer.view;
        UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
        [pasteboard setString:someLabel.text];
        ...
        //let the user know you copied the text to the pasteboard and they can no paste it somewhere else
        ...
    }
}

- (void) textTapped:(UITapGestureRecognizer *) gestureRecognizer {
    if (gestureRecognizer.state == UIGestureRecognizerStateRecognized &&
        [gestureRecognizer.view isKindOfClass:[UILabel class]]) {
            UILabel *someLabel = (UILabel *)gestureRecognizer.view;
            UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
            [pasteboard setString:someLabel.text];
            ...
            //let the user know you copied the text to the pasteboard and they can no paste it somewhere else
            ...
    }
}