长按复制的UILabel

UILabel 长按复制

注意Swift中Runtime的UnsafeRawPointer的问题

自从某个版本iOS的Label不再支持复制之后，才有了这个需求，给出了两版代码，并且在写的过程中发现了Swift Runtime的UnsafeRawPointer问题

Swift版本

private var copyKey:String = "COPY"
private var titleKey:String = "TITLE"

extension UILabel {

    //设置是否可以拷贝
    var canCopy:Bool {
        get {
            return objc_getAssociatedObject(self,&copyKey) as! Bool
        }
        set {
            objc_setAssociatedObject(self, &copyKey, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_ASSIGN)
            addLongPressGesture()
        }
    }
    //设置复制文字
    var copyTitle:String {
        get {
            var title =  objc_getAssociatedObject(self, &titleKey)
            if(title == nil) {
                title = "复制"
            }
            return title as! String
        }
        set {
            objc_setAssociatedObject(self, &titleKey, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_COPY_NONATOMIC)
        }

    }
    //添加长按手势
    func addLongPressGesture() -> Void {
        self.isUserInteractionEnabled = true
        self.addGestureRecognizer(UILongPressGestureRecognizer.init(target: self, action:#selector(self.longPressToCopy(recognizer:))))
    }
    //处理长按收拾
    @objc fileprivate func longPressToCopy(recognizer: UILongPressGestureRecognizer) {
        if (recognizer.state == .ended) {
            becomeFirstResponder()
            let item = UIMenuItem(title: copyTitle, action: #selector(UILabel.copyText(sender:)))
            UIMenuController.shared.menuItems = [item]
            UIMenuController.shared.setTargetRect(self.frame, in: self.superview!)
            UIMenuController.shared.setMenuVisible(true, animated: true)
        }
    }

    @objc fileprivate func copyText(sender: Any) {
        //通用粘贴板
        let pasteBoard = UIPasteboard.general
        //有时候只想取UILabel得text中一部分
        if(self.text != nil) {
            pasteBoard.string = self.text;
            return
        }
        if(self.attributedText != nil) {
            pasteBoard.string = self.attributedText?.string
            return
        }
    }
    //使label成为第一响应者
    open override var canBecomeFirstResponder: Bool{
        return canCopy
    }

}

OC版本

/**
 * 使用Runtime给Label添加复制标签
 */
@interface UILabel (Copy)

/**
 * 是否可以复制
 */
@property (nonatomic, assign, getter=isCopy) BOOL canCopy;
@property (nonatomic, copy) NSString *copyTitle;

@end


@implementation UILabel (Copy)

/**
 * Get
 */
- (BOOL)isCopy {
    return [objc_getAssociatedObject(self, @"canCopy") boolValue];
}

/**
 * Set
 */
- (void)setCanCopy:(BOOL)canCopy {
    objc_setAssociatedObject(self, @"canCopy", @(canCopy), OBJC_ASSOCIATION_ASSIGN);
    [self attachTapHandler];

}

/**
 * Get 显示什么语言的复制
 */
- (NSString *)copyTitle {
    id title = objc_getAssociatedObject(self, @"copyTitle");
    if(title == nil) {
        title = @"复制";
    }
    return title;
}

/**
 * Set 显示什么语言的复制
 */
- (void)setCopyTitle:(NSString *)copyTitle {
    objc_setAssociatedObject(self, @"canCopy", copyTitle, OBJC_ASSOCIATION_COPY_NONATOMIC);
}


/**
 * 添加长按手势
 */
- (void)attachTapHandler {
    [self setUserInteractionEnabled:YES];
    UILongPressGestureRecognizer *longPress = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:@selector(handleLongPress:)];
    [self addGestureRecognizer:longPress];
}
/**
 * 添加MenuBar
 * @param gesture
 */
- (void)handleLongPress:(UILongPressGestureRecognizer *)gesture {
    if(gesture.state == UIGestureRecognizerStateEnded) {
        [self becomeFirstResponder];
        UIMenuItem *menuItem = [[UIMenuItem alloc] initWithTitle:[self copyTitle] action:@selector(copyText:)];
        [UIMenuController sharedMenuController].menuItems = @[menuItem];
        [[UIMenuController sharedMenuController] setTargetRect:self.frame inView:self.superview];
        [[UIMenuController sharedMenuController] setMenuVisible:YES animated:YES];
    }
}

/**
 * 添加复制功能
 * @param sender
 */
- (void)copyText:(id)sender {
    UIPasteboard *pasteboard = [UIPasteboard generalPasteboard];
    if(self.text) {
        [pasteboard setString:self.text];
        return;
    }
    if (self.attributedText) {
        [pasteboard setString:self.attributedText.string];
        return;
    }
}

/**
 * 重载是否能成为第一响应者
 * @return
 */
- (BOOL)canBecomeFirstResponder {
    return [self isCopy];
}


@end

赏

请问老板还招人么(/ω＼)

支付宝

微信