首先生成一个继承与UILabel的类SFPStrikeThroughAndUnderLineLabel
一，在.h文件里
@interface SFPStrikeThroughAndUnderLineLabel : UILabel
{
BOOL _isWithStrikeThrough;
}
@property (nonatomic, assign) BOOL isWithStrikeThrough; //控制是否显示删除线
@property (nonatomic, assign) CGFloat strikeThroughLineWidth;//设置删除线的宽度
@property (nonatomic, retain) NSArray *strikeThroughRGBAlphaArray;//设置删除线的颜色,数组里面的元素分别是RGB以及alpha值也就是说该数组有四个元素
@end
二，在.m文件里
#import "SFPStrikeThroughAndUnderLineLabel.h"
@implementation SFPStrikeThroughAndUnderLineLabel
@synthesize isWithStrikeThrough = _isWithStrikeThrough;
@synthesize strikeThroughRGBAlphaArray = _strikeThroughRGBAlphaArray;
@synthesize strikeThroughLineWidth = _strikeThroughLineWidth;
- (id)initWithFrame:(CGRect)frame
{
self = [super initWithFrame:frame];
if (self) {
// Initialization code
self.strikeThroughRGBAlphaArray = [[NSArrayalloc]initWithObjects:@"0",@"0",@"0",@"1", nil];//默认删除线的颜色是黑色切实不透明的，给个默认值，建立对象时该属性可以不必赋值
self.strikeThroughLineWidth = 1;//默认删除线的宽度是1pix
}
returnself;
}
// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
// Drawing code
if (self.isWithStrikeThrough)//显示删除线
{
CGContextRef c = UIGraphicsGetCurrentContext();
CGFloat color[4] = {[[self.strikeThroughRGBAlphaArrayobjectAtIndex:0] floatValue], [[self.strikeThroughRGBAlphaArrayobjectAtIndex:1] floatValue], [[self.strikeThroughRGBAlphaArrayobjectAtIndex:2] floatValue], [[self.strikeThroughRGBAlphaArrayobjectAtIndex:3] floatValue]};
CGContextSetStrokeColor(c, color);
CGContextSetLineWidth(c, self.strikeThroughLineWidth);
CGContextBeginPath(c);
CGFloat halfWayUp = (self.bounds.size.height - self.bounds.origin.y) / 2.0;
CGContextMoveToPoint(c, self.bounds.origin.x, halfWayUp );
CGContextAddLineToPoint(c, self.bounds.origin.x + self.bounds.size.width, halfWayUp);
CGContextStrokePath(c);
}
[super drawRect:rect];
}
三，使用：添加SFPStrikeThroughAndUnderLineLabel.h文件
SFPStrikeThroughAndUnderLineLabel *oneLabel = [[SFPStrikeThroughAndUnderLineLabelalloc]initWithFrame:CGRectMake(20, 20, 100, 200)];
oneLabel.backgroundColor = [UIColorwhiteColor];
oneLabel.numberOfLines = 0;
oneLabel.text = @"朱冬玲,我爱你一万年；朱冬玲,我爱你一万年；朱冬玲,我爱你一万年；朱冬玲,我爱你一万年；朱冬玲,我爱你一万年";
oneLabel.isWithStrikeThrough = YES;
// 下面这两个属性可设可不设值，他们设的都有默认值
// oneLabel.rgbAlphaArray = [NSArray arrayWithObjects:@"255",@"255",@"0",@"1", nil];
// oneLabel.strikeThroughLineWidth = 20;
[self.view addSubview:oneLabel];
注意：这是给UILabel整个控件加删除线（一个label只会有一条删除线），而不是给label的text加删除线