通用分页配置。

UIViewController+HDPaging.h

//
//  UIViewController+HDPaging.h
//  Haidora
//
//  Created by Dailingchi on 15/5/29.
//  Copyright (c) 2015年 Haidora. All rights reserved.
//

#import <UIKit/UIKit.h>

/**
 *  分页逻辑
 */
@interface UIViewController (HDPaging)

/**
 *  当前页,默认加载HDPagingConfig中startPage.
 */
@property (nonatomic, assign) NSInteger currentPage;

/**
 *  分页大小,默认加载HDPagingConfig中pageSize.
 */
@property (nonatomic, assign, readonly) NSInteger pageSize;

/**
 *  分页标志,默认为NO
 */
@property (nonatomic, assign, getter=isHaveNextPage) BOOL haveNextPage;

@end

/**
 *  分页配置信息
 */
@interface HDPagingConfig : NSObject

/**
 *  起始页,默认为0.
 */
@property (nonatomic, assign) NSInteger startPage;

/**
 *  分页大小,默认为10.
 */
@property (nonatomic, assign) NSInteger pageSize;

+ (HDPagingConfig *)sharedInstance;

@end

UIViewController+HDPaging.m

//
//  UIViewController+Paging.m
//  Haidora
//
//  Created by Dailingchi on 15/5/29.
//  Copyright (c) 2015年 Haidora. All rights reserved.
//

#import "UIViewController+HDPaging.h"
#import <objc/runtime.h>
#import <Aspects.h>

static char *kHDCurrentPage = "kHDCurrentPage";
static char *kHDPageSize = "kHDPageSize";
static char *kHDHaveNextPage = "kHDHaveNextPage";

@implementation UIViewController (HDPaging)

//可以移动到一个拦截器里面
// https://gitcafe.com/casatwy/iOSViewArchDemo1/blob/master/Interceptor/CTViewControllerIntercepter.m
+ (void)load
{
    NSError *error;
    [UIViewController aspect_hookSelector:@selector(viewDidLoad)
                              withOptions:AspectPositionBefore
                               usingBlock:^(id<AspectInfo> aspectInfo) {
                                 //注入逻辑
                                 UIViewController *viewController = [aspectInfo instance];
                                 viewController.currentPage =
                                     [HDPagingConfig sharedInstance].startPage;
                                 viewController.pageSize = [HDPagingConfig sharedInstance].pageSize;
                                 viewController.haveNextPage = NO;
                               } error:&error];
#ifdef DEBUG
    if (error)
    {
        NSLog(@"%@", error);
    }
#endif
}

#pragma mark
#pragma mark Setter/Getter

- (void)setCurrentPage:(NSInteger)currentPage
{
    objc_setAssociatedObject(self, kHDCurrentPage, @(currentPage), OBJC_ASSOCIATION_ASSIGN);
}

- (NSInteger)currentPage
{
    return [objc_getAssociatedObject(self, kHDCurrentPage) integerValue];
}

- (void)setPageSize:(NSInteger)pageSize
{
    objc_setAssociatedObject(self, kHDPageSize, @(pageSize), OBJC_ASSOCIATION_ASSIGN);
}

- (NSInteger)pageSize
{
    return [objc_getAssociatedObject(self, kHDPageSize) integerValue];
}

- (void)setHaveNextPage:(BOOL)haveNextPage
{
    objc_setAssociatedObject(self, kHDHaveNextPage, @(haveNextPage), OBJC_ASSOCIATION_ASSIGN);
}

- (BOOL)isHaveNextPage
{
    return [objc_getAssociatedObject(self, kHDHaveNextPage) boolValue];
}

@end

@implementation HDPagingConfig

static HDPagingConfig *sharedHDPagingConfig = nil;

+ (HDPagingConfig *)sharedInstance
{
    static dispatch_once_t onceToken;
    dispatch_once(&onceToken, ^{
      sharedHDPagingConfig = [[HDPagingConfig alloc] init];
      sharedHDPagingConfig.startPage = 0;
      sharedHDPagingConfig.pageSize = 10;
    });
    return sharedHDPagingConfig;
}

@end