修改CCLabelTTF行间距的办法

因为策划需要修改文字面板上的行间距，看了一阵CCLabelTTF想不出怎么改，于是上网各种找，终于在stackoverflow上找到了前辈们的解决办法。特摘录如下：
问：
Is there anyway in ios app to adjust the linespacing between the multiple lines in CCLabelTTF in cocos2d?

答：
"homemade" solution

#import <Foundation/Foundation.h>
#import "cocos2d.h"

@interface CCLabelTTFLineSpaced : CCLayer {
}

+ (id) labelWithString:(NSString*)string dimensions:(CGSize)dimensions hAlignment:  (CCTextAlignment)alignment fontName:(NSString*)name fontSize:(CGFloat)size lineSpace:(CGFloat)space;

- (id) initWithString:(NSString*)str dimensions:(CGSize)dimensions hAlignment:(CCTextAlignment)alignment fontName:(NSString*)name fontSize:(CGFloat)size lineSpace:(CGFloat)space;

@end

@implementation CCLabelTTF(Extension)
+ (id)labelWithString:(NSString *)string dimensions:(CGSize)dimensions hAlignment:(CCTextAlignment)alignment fontName:(NSString *)name fontSize:(CGFloat)size lineSpace:(CGFloat)space{
    return [[[self alloc] initWithString:string dimensions:dimensions hAlignment:alignment fontName:name fontSize:size lineSpace:space] autorelease];
}

- (id)initWithString:(NSString *)string dimensions:(CGSize)dimensions hAlignment:(CCTextAlignment)alignment fontName:(NSString *)name fontSize:(CGFloat)size lineSpace:(CGFloat)space
{
    if (self = [super init]) {
        anchorPoint_ = ccp(0.5f, 0.5f);
        [self setContentSize:dimensions];
        
        int pos = 0;
        int ii = 0;
        while (pos < [string length]) {
            int end = 0;
            int lastCut = -1;
            bool finished = NO;
            while (finished == NO) {
                CGSize actualSize = [[string substringWithRange:NSMakeRange(pos, end)] sizeWithFont:[UIFont fontWithName:name size:size]];
                if (actualSize.width > dimensions.width || pos+end == [string length]) {
                    if (pos+end == [string length] && actualSize.width <= dimensions.width) {
                        lastCut = end;
                    }
                    finished = YES;
                }else {
                    if ([[string substringWithRange:NSMakeRange(pos+end, 1)] isEqualToString:@" "] ||
                        [[string substringWithRange:NSMakeRange(pos+end, 1)] isEqualToString:@"."] ||
                        [[string substringWithRange:NSMakeRange(pos+end, 1)] isEqualToString:@""]) {
                        lastCut = end;
                    }
                    end++;
                }
            }
            
            NSString *strLine = [string substringWithRange:NSMakeRange(pos, lastCut)];
            CCLabelTTF *line = [CCLabelTTF labelWithString:strLine dimensions:CGSizeMake(dimensions.width, size*2) hAlignment:alignment fontName:name fontSize:size];
            [line setAnchorPoint:ccp(0, 0)];
            [line setPosition:ccp(0, -ii*(space+size))];
            
            [self addChild:line];
            
            pos = pos + lastCut;
            ii++;
        }
    }
    return self;
}

@end

原地址：http://stackoverflow.com/questions/7856833/line-spacing-in-cclabelttf