通常的添加阴影只能给label添加，但是不能给label的文字添加。这次就来说一下如何给文字添加阴影。废话不说，直接上代码吧，有问题或者更好的建议欢迎评论哦。其实一开始自己也是想写一个category的，但是发现不行，如果有谁有好办法，一定要告诉我哦，谢谢啦！

#import <UIKit/UIKit.h>

@interface BorderTextLabel : UILabel

/** 描边宽度*/

@property (nonatomic, assign) CGFloat textBorderWidth;

/** 描边颜色*/

@property (nonatomic, strong) UIColor *textBorderColor;

/** 带阴影的文字*/

@property (nonatomic, strong) NSString *shadowText;

@end

#import "BorderTextLabel.h"

@implementation BorderTextLabel

@synthesize textBorderWidth = _textBorderWidth, textBorderColor = _textBorderColor, shadowText = _shadowText;

- (void)drawTextInRect:(CGRect)rect {

    UIColor *textColor = self.textColor;
    
    CGContextRef c = UIGraphicsGetCurrentContext();
    CGContextSetLineWidth(c, self.textBorderWidth);
    CGContextSetLineJoin(c, kCGLineJoinRound);
    
    CGContextSetTextDrawingMode(c, kCGTextStroke);
    self.textColor = self.textBorderColor;
    [super drawTextInRect:rect];
    
    CGContextSetTextDrawingMode(c, kCGTextFill);
    self.textColor = textColor;
    self.shadowOffset = CGSizeMake(0, 0);
    [super drawTextInRect:rect];
}

-(void)setShadowText:(NSString *)shadowText {
    _shadowText = shadowText;
    NSShadow *shadow = [[NSShadow alloc] init];
    shadow.shadowBlurRadius = 1.5;
    shadow.shadowOffset = CGSizeMake(0, 0);
    shadow.shadowColor = [UIColor colorWithRed:0 green:0 blue:0 alpha:0.3];
    NSAttributedString *attributedStr = [[NSAttributedString alloc] initWithString:shadowText
                                                                        attributes:@{NSShadowAttributeName:shadow}];
    self.attributedText = attributedStr;
}

@end

synthesize一定要写，否则不生效哦。