DXStringPaginator.m

//
//  DXStringPaginator.m
//  DoxOnBox
//
//  Created by Arshad Tayyeb on 7/21/12.
//  Copyright (c) 2012 __MyCompanyName__. All rights reserved.
//

#import "DXStringPaginator.h"

@interface DXStringPaginator()
+ (DXStringPaginator *)sharedPaginator;
- (NSArray *)pagesInString:(NSString *)string withFont:(UIFont *)font frameSize:(CGSize)frameSize;
@end

static DXStringPaginator *g_stringPaginator = nil;

@implementation DXStringPaginator
{
    
}

+ (DXStringPaginator *)sharedPaginator
{
    if (!g_stringPaginator)
    {
        g_stringPaginator = [[DXStringPaginator alloc] init];
    }
    return g_stringPaginator;
}

- (id)init
{
    if (self = [super init])
    {
    }
    return self;
}

- (NSArray *)sentencesInString:(NSString *)string
{
    __block NSMutableArray *sentences = [[NSMutableArray alloc] init];
    [string enumerateSubstringsInRange:NSMakeRange(0, string.length) options:NSStringEnumerationBySentences usingBlock:^(NSString *substring, NSRange substringRange, NSRange enclosingRange, BOOL *stop) {
        [sentences addObject:[string substringWithRange:substringRange]];
    }];
    return sentences;
}

+ (NSArray *)sentencesInString:(NSString *)string
{
    return [[DXStringPaginator sharedPaginator] sentencesInString:string];
}


- (NSArray *)pagesInString:(NSString *)string withFont:(UIFont *)font frameSize:(CGSize)frameSize
{
    NSArray *sentences = [self sentencesInString:string];
        
    NSMutableArray *allPages = [NSMutableArray array];
    
    NSMutableString *onePageString = [[NSMutableString alloc] init];
    
    for (NSString *sentence in sentences)
    {
        [onePageString appendString:sentence];
        
        CGSize constraintSize = CGSizeMake(frameSize.width, MAXFLOAT);
        CGSize textSize = [onePageString sizeWithFont:font 
                                               constrainedToSize:constraintSize lineBreakMode:UILineBreakModeWordWrap];
        
        if (textSize.height > frameSize.height - font.pointSize * (font.pointSize/2))
        {
            [allPages addObject:onePageString];
            onePageString = [NSMutableString string];
        }
    }
    
    if (onePageString.length> 0)
    {
        [allPages addObject:onePageString];
    }
        
    return allPages;    
}

+ (NSArray *)pagesInString:(NSString *)string withFont:(UIFont *)font frameSize:(CGSize)frameSize
{
    return [[DXStringPaginator sharedPaginator] pagesInString:string withFont:font frameSize:frameSize];
}

@end