ios:customcontrols:文字中间带条线条

StrikeLabel.m

//
//  StrikeLabel.h
//  UCBook
//
//  Created by apple on 13-1-23.
//  Copyright (c) 2013年 __MyCompanyName__. All rights reserved.
//

#import <UIKit/UIKit.h>

@interface StrikeLabel : UILabel
@property (nonatomic) BOOL strikeThroughEnabled;
@end


//
//  StrikeLabel.m
//  UCBook
//
//  Created by apple on 13-1-23.
//  Copyright (c) 2013年 __MyCompanyName__. All rights reserved.
//

#import "StrikeLabel.h"

@implementation StrikeLabel
@synthesize strikeThroughEnabled=_strikeThroughEnabled;

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];
    if (self) {
        // Initialization code
    }
    return self;
}


// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    // Drawing code
    [super drawTextInRect:rect];
    
    CGSize textSize = [[self text] sizeWithFont:[self font]];
    CGFloat strikeWidth = textSize.width;
    CGRect lineRect;
    
    if ([self textAlignment] == UITextAlignmentRight) {
        lineRect = CGRectMake(rect.size.width - strikeWidth, rect.size.height/2, strikeWidth, 1);
    } else if ([self textAlignment] == UITextAlignmentCenter) {
        lineRect = CGRectMake(rect.size.width/2 - strikeWidth/2, rect.size.height/2, strikeWidth, 1);
    } else {
        lineRect = CGRectMake(0, rect.size.height/2, strikeWidth, 1);
    }
    
    if (_strikeThroughEnabled) {
        CGContextRef context = UIGraphicsGetCurrentContext();
        CGContextFillRect(context, lineRect);
    }
}


- (void)setStrikeThroughEnabled:(BOOL)strikeThroughEnabled {
    
    _strikeThroughEnabled = strikeThroughEnabled;
    
    NSString *tempText = [self.text copy];
    self.text = @"";
    self.text = tempText;
}

@end

//范例
//[strikeLabel_instance setStrikeThroughEnabled:YES];