iboss-ios/IBOSS/Utils/PageModel/PageModel.m

//
//  PageModel.m
//  IBOSS
//
//  Created by guan hong hou on 2017/8/22.
//  Copyright © 2017年 elongtian. All rights reserved.
//
//  功能描述:分页模型

#import "PageModel.h"
@interface  PageModel (){
    NSInteger page; // 当前页
    NSInteger totalPages; // 总页数
    NSInteger pageRecorders;// 每页数据数
    NSInteger totalRows; // 总数据数
    NSInteger pageStartRow;// 每页的起始数
    NSInteger pageEndRow; // 每页显示数据的终止数
    Boolean hasNextPage; // 是否有下一页
    Boolean hasPreviousPage; // 是否有前一页
    NSMutableArray *dataList;//数据列表
}
@end

@implementation PageModel


/**
  初始化分页数组和记录数
 @param dataArray <#dataArray description#>
 @param recorders <#recorders description#>
 */
-(void)setPage:(NSMutableArray*)dataArray pageRecorders:(NSInteger)recorders{
    page=0;
    totalPages = 0;
    totalRows = 0;
    pageStartRow = 0;
    pageEndRow = 0;
    hasNextPage = NO;
    hasPreviousPage = NO;
    pageRecorders = recorders;
    dataList= dataArray;
    totalRows = dataList.count;
        hasPreviousPage = false;
    if ((totalRows % pageRecorders) == 0) {
        totalPages = totalRows / pageRecorders;
    } else {
        totalPages = totalRows / pageRecorders + 1;
    }
    
    if (page >= totalPages) {
        hasNextPage = false;
    } else {
        hasNextPage = true;
    }
    
    if (totalRows < pageRecorders) {
        pageStartRow = 0;
        pageEndRow = totalRows;
    } else {
        pageStartRow = 0;
        pageEndRow = pageRecorders;
    }
    
}


/**
  处理页数
 */
-(void)disposePage{
    if (page == 0) {
        page = 1;
    }
    
    if ((page - 1) > 0) {
        hasPreviousPage = true;
    } else {
        hasPreviousPage = false;
    }
    
    if (page >= totalPages) {
        hasNextPage = false;
    } else {
        hasNextPage = true;
    }
}


/**
 获取分页的子列表
 @param pageNumber <#pageNumber description#>
 @return <#return value description#>
 */
-(NSArray*)getObjects:(NSInteger)pageNumber{
   
    [self setPage:pageNumber];
    [self disposePage];
    if (page * pageRecorders < totalRows) {// 判断是否为最后一页
        pageEndRow = page * pageRecorders;
        pageStartRow = pageEndRow - pageRecorders;
    } else {
        pageEndRow = totalRows;
        pageStartRow = pageRecorders * (totalPages - 1);
    }
    
    NSArray *objects = nil;
    if (dataList!=nil&&dataList.count>0) {
      NSInteger recorders=  pageEndRow-pageStartRow;
        objects = [dataList subarrayWithRange:NSMakeRange(pageStartRow,recorders)];
           }
    
    return objects;
}


/**
 设置页号
 @param pageNumber <#pageNumber description#>
 */
- (void)setPage:(NSInteger)pageNumber {
    page = pageNumber;
}
@end