UILabel * label = [[UILabel alloc]initWithFrame:self.view.bounds];
label.text = self.liveId;
label.backgroundColor = [UIColor redColor];
[self.view addSubview:label];

[label setShadowColor:[UIColor yellowColor]];//用法

// MSShadowLabel.h
// BPG_Scrollview
//
// Created by bai on 2016/11/23.
// Copyright © 2016年 bai. All rights reserved.
//

import <UIKit/UIKit.h>

import <SpriteKit/SpriteKit.h>

@interface MSShadowLabel : SKLabelNode

• (void)setShadowColor:(UIColor *)color;
• (void)setShadowOffset:(CGSize)offset;
• (void)setShadowOpacity:(CGFloat)opacity;
• (void)setShadowHidden:(BOOL)isHidden;
  @end

// MSShadowLabel.m
// MagicSword
//
// Created by Netease on 15/12/2.
// Copyright © 2015年 Jonear. All rights reserved.
//

import "MSShadowLabel.h"

@implementation MSShadowLabel {
SKLabelNode *_dropLabel;
SKLabelNode *_dropShadow;
}

• (id)initWithFontNamed:(NSString *)fontName {
  self = [super initWithFontNamed:fontName];
  if (self) {
  _dropLabel = [[SKLabelNode alloc] initWithFontNamed:fontName];
  [_dropLabel setPosition:CGPointMake(0, 0)];
  [_dropLabel setFontSize:self.fontSize];
  [_dropLabel setFontColor:[UIColor whiteColor]];
  [_dropLabel setZPosition:2];
  [self addChild:_dropLabel];

    _dropShadow = [[SKLabelNode alloc] initWithFontNamed:fontName];
    [_dropShadow setPosition:CGPointMake(1, -1)];
    [_dropShadow setFontSize:self.fontSize];
    [_dropShadow setFontColor:[UIColor blackColor]];
    [_dropShadow setZPosition:1];
    [self addChild:_dropShadow];
  

  }
  return self;
  }

• (void)setShadowColor:(UIColor *)color {
  [_dropShadow setFontColor:color];
  }

• (void)setShadowOffset:(CGSize)offset {
  [_dropShadow setPosition:CGPointMake(offset.width, -offset.height)];
  }

• (void)setShadowOpacity:(CGFloat)opacity {
  [_dropShadow setAlpha:opacity];
  }

• (void)setShadowHidden:(BOOL)isHidden {
  [_dropShadow setHidden:isHidden];
  }

• (void)setText:(NSString *)text {
  [_dropLabel setText:text];
  [_dropShadow setText:text];
  }

• (void)setFontSize:(CGFloat)fontSize {
  [_dropLabel setFontSize:fontSize];
  [_dropShadow setFontSize:fontSize];
  }

• (void)setFontColor:(UIColor *)fontColor {
  [_dropLabel setFontColor:fontColor];
  }

• (void)setPosition:(CGPoint)position {
  [super setPosition:position];
  }

• (void)setHorizontalAlignmentMode:(SKLabelHorizontalAlignmentMode)horizontalAlignmentMode {
  [_dropLabel setHorizontalAlignmentMode:horizontalAlignmentMode];
  [_dropShadow setHorizontalAlignmentMode:horizontalAlignmentMode];
  }

• (void)setVerticalAlignmentMode:(SKLabelVerticalAlignmentMode)verticalAlignmentMode {
  [_dropLabel setVerticalAlignmentMode:verticalAlignmentMode];
  [_dropShadow setVerticalAlignmentMode:verticalAlignmentMode];
  }

• (void)setName:(NSString *)name {
  [super setName:name];
  [_dropLabel setName:name];
  [_dropShadow setName:name];
  }
  @end