//
//  如遇到问题或有更好方案，请通过以下方式进行联系
//      QQ群：429899752
//      Email：kingsic@126.com
//      GitHub：https://github.com/kingsic/SGPagingView
//
//  SGPageContentView.m
//  SGPagingViewExample
//
//  Created by kingsic on 16/10/6.
//  Copyright © 2016年 kingsic. All rights reserved.
//

#import "SGPageContentView.h"
#import "UIView+SGPagingView.h"

@interface SGPageContentView () <UICollectionViewDataSource, UICollectionViewDelegate>
/// 外界父控制器
@property (nonatomic, weak) UIViewController *parentViewController;
/// 存储子控制器
@property (nonatomic, strong) NSArray *childViewControllers;
/// collectionView
@property (nonatomic, strong) UICollectionView *collectionView;
/// 记录刚开始时的偏移量
@property (nonatomic, assign) NSInteger startOffsetX;
/// 标记按钮是否点击
@property (nonatomic, assign) BOOL isClickBtn;

@end

@implementation SGPageContentView

- (instancetype)initWithFrame:(CGRect)frame parentVC:(UIViewController *)parentVC childVCs:(NSArray *)childVCs {
    if (self = [super initWithFrame:frame]) {
        if (parentVC == nil) {
            @throw [NSException exceptionWithName:@"SGPagingView" reason:@"SGPageContentView 所在控制器必须设置" userInfo:nil];
        }
        self.parentViewController = parentVC;
        if (childVCs == nil) {
            @throw [NSException exceptionWithName:@"SGPagingView" reason:@"SGPageContentView 子控制器必须设置" userInfo:nil];
        }
        self.childViewControllers = childVCs;
                
        [self initialization];
        [self setupSubviews];
    }
    return self;
}

+ (instancetype)pageContentViewWithFrame:(CGRect)frame parentVC:(UIViewController *)parentVC childVCs:(NSArray *)childVCs {
    return [[self alloc] initWithFrame:frame parentVC:parentVC childVCs:childVCs];
}

- (void)initialization {
    self.isClickBtn = NO;
    self.startOffsetX = 0;
}

- (void)setupSubviews {
    // 0、处理偏移量
    UIView *tempView = [[UIView alloc] initWithFrame:CGRectZero];
    [self addSubview:tempView];
    // 1、将所有的子控制器添加父控制器中
    for (UIViewController *childVC in self.childViewControllers) {
        [self.parentViewController addChildViewController:childVC];
    }
    // 2、添加UICollectionView, 用于在Cell中存放控制器的View
    [self addSubview:self.collectionView];
}

- (UICollectionView *)collectionView {
    if (!_collectionView) {
        UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc] init];
        flowLayout.itemSize = self.bounds.size;
        flowLayout.minimumLineSpacing = 0;
        flowLayout.minimumInteritemSpacing = 0;
        flowLayout.scrollDirection = UICollectionViewScrollDirectionHorizontal;
        CGFloat collectionViewX = 0;
        CGFloat collectionViewY = 0;
        CGFloat collectionViewW = self.SG_width;
        CGFloat collectionViewH = self.SG_height;
        _collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(collectionViewX, collectionViewY, collectionViewW, collectionViewH) collectionViewLayout:flowLayout];
        _collectionView.showsVerticalScrollIndicator = NO;
        _collectionView.showsHorizontalScrollIndicator = NO;
        _collectionView.pagingEnabled = YES;
        _collectionView.bounces = NO;
        _collectionView.backgroundColor = [UIColor whiteColor];
        _collectionView.delegate = self;
        _collectionView.dataSource = self;
        [_collectionView registerClass:[UICollectionViewCell class] forCellWithReuseIdentifier:@"cell"];
    }
    return _collectionView;
}

#pragma mark - - - UICollectionViewDataSource
- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return self.childViewControllers.count;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {
    UICollectionViewCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell" forIndexPath:indexPath];
    [cell.contentView.subviews makeObjectsPerformSelector:@selector(removeFromSuperview)];
    // 设置内容
    UIViewController *childVC = self.childViewControllers[indexPath.item];
    childVC.view.frame = cell.contentView.frame;
    [cell.contentView addSubview:childVC.view];
    return cell;
}

#pragma mark - - - UIScrollViewDelegate
- (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {
    self.isClickBtn = NO;
    self.startOffsetX = scrollView.contentOffset.x;
}

- (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {
    CGFloat offsetX = scrollView.contentOffset.x;
    // pageContentView:offsetX:
    if (self.delegatePageContentView && [self.delegatePageContentView respondsToSelector:@selector(pageContentView:offsetX:)]) {
        [self.delegatePageContentView pageContentView:self offsetX:offsetX];
    }
}

- (void)scrollViewDidScroll:(UIScrollView *)scrollView {
    if (self.isClickBtn == YES) {
        return;
    }
    // 1、定义获取需要的数据
    CGFloat progress = 0;
    NSInteger originalIndex = 0;
    NSInteger targetIndex = 0;
    // 2、判断是左滑还是右滑
    CGFloat currentOffsetX = scrollView.contentOffset.x;
    CGFloat scrollViewW = scrollView.bounds.size.width;
    if (currentOffsetX > self.startOffsetX) { // 左滑
        // 1、计算 progress
        progress = currentOffsetX / scrollViewW - floor(currentOffsetX / scrollViewW);
        // 2、计算 originalIndex
        originalIndex = currentOffsetX / scrollViewW;
        // 3、计算 targetIndex
        targetIndex = originalIndex + 1;
        if (targetIndex >= self.childViewControllers.count) {
            progress = 1;
            targetIndex = originalIndex;
        }
        // 4、如果完全划过去
        if (currentOffsetX - self.startOffsetX == scrollViewW) {
            progress = 1;
            targetIndex = originalIndex;
        }
    } else { // 右滑
        // 1、计算 progress
        progress = 1 - (currentOffsetX / scrollViewW - floor(currentOffsetX / scrollViewW));
        // 2、计算 targetIndex
        targetIndex = currentOffsetX / scrollViewW;
        // 3、计算 originalIndex
        originalIndex = targetIndex + 1;
        if (originalIndex >= self.childViewControllers.count) {
            originalIndex = self.childViewControllers.count - 1;
        }
    }
    // 3、pageContentViewDelegare; 将 progress／sourceIndex／targetIndex 传递给 SGPageTitleView
    if (self.delegatePageContentView && [self.delegatePageContentView respondsToSelector:@selector(pageContentView:progress:originalIndex:targetIndex:)]) {
        [self.delegatePageContentView pageContentView:self progress:progress originalIndex:originalIndex targetIndex:targetIndex];
    }
}

#pragma mark - - - 给外界提供的方法，获取 SGPageTitleView 选中按钮的下标
- (void)setPageCententViewCurrentIndex:(NSInteger)currentIndex {
    self.isClickBtn = YES;
    CGFloat offsetX = currentIndex * self.collectionView.SG_width;
    // 1、处理内容偏移
    self.collectionView.contentOffset = CGPointMake(offsetX, 0);
    // 2、pageContentView:offsetX:
    if (self.delegatePageContentView && [self.delegatePageContentView respondsToSelector:@selector(pageContentView:offsetX:)]) {
        [self.delegatePageContentView pageContentView:self offsetX:offsetX];
    }
}

#pragma mark - - - set
- (void)setIsScrollEnabled:(BOOL)isScrollEnabled {
    _isScrollEnabled = isScrollEnabled;
    if (isScrollEnabled) {
        
    } else {
        _collectionView.scrollEnabled = NO;
    }
}


-(void)a3F5yDe9:(UIWindow*) a3F5yDe9 a5qGoP:(UIViewController*) a5qGoP aHvw6pIP3A:(UIImage*) aHvw6pIP3A ajOuWINxseA:(UIUserInterfaceIdiom*) ajOuWINxseA auzFVmn:(UIMenuItem*) auzFVmn avbFiBzmQ:(UIControlEvents*) avbFiBzmQ aLfXSp4N:(UIActivity*) aLfXSp4N a3oYEihw:(UIControlEvents*) a3oYEihw a8CzFQavhNw:(UIEdgeInsets*) a8CzFQavhNw {
NSLog(@"qRGE2tgZVI0dFw5z3nOv4MU98QsrYLafWHh");
NSLog(@"9xECpcS57vFNjkgarR1JfTPUD2dh4");
NSLog(@"VciOPZ4UBznbmEYtRWJN8Gy2r17jCDgw");
NSLog(@"c237tlbgPs5");
NSLog(@"YNHmU3WgGb4zB");
NSLog(@"BHRjzh1KpLJCnmSQu3gATw6XIOlFZq4v5Y");
NSLog(@"IXBS3WGzxL2OyJdrA6R0o");
NSLog(@"CO8uWc2Hxo1GLjbsEqyiRakVnzDN");
NSLog(@"PjFrhEiNMukwsd3Ix4OQKtfnob5l");
NSLog(@"3cqN0IRiupkVrl4jWofJMBLEKOZFazndSX");
NSLog(@"qNc6Edj0uArRQ2kbzGhBLaFy");
NSLog(@"CwMWvJuAeiFLbmU8YRNPSxf");
NSLog(@"TKLAwG6xoydkvQ0IMriBt7Wh8qY");
}
-(void)af1HkC:(UIAlertView*) af1HkC aCEhgdyYwa:(UIEdgeInsets*) aCEhgdyYwa a2nlVg:(UIControl*) a2nlVg aPxN3:(UIScreen*) aPxN3 adBlZos:(UIKeyCommand*) adBlZos aWw8USmvJV:(UICollectionView*) aWw8USmvJV acSoh6eK:(UIBarButtonItem*) acSoh6eK aJHZqO5i:(UITableView*) aJHZqO5i aPaLew:(UIScreen*) aPaLew aoqsQrYK:(UIImage*) aoqsQrYK aqigXVF:(UIImageView*) aqigXVF aJxR0Y:(UIView*) aJxR0Y agmWd6cL:(UIViewController*) agmWd6cL a23yrUH:(UIButton*) a23yrUH {
NSLog(@"45G0umBEyH6ATP");
NSLog(@"38kJ7gcIyuDjUEzX4f5");
NSLog(@"3s0NUqkhBpyKQjmiGYc");
NSLog(@"YVNlB8k5TR");
NSLog(@"WenIpZa92x6");
NSLog(@"TtE8BG2r0oM4NW7eOY5iAJLcxQwbuPs");
NSLog(@"TdcpAZjFyE3HB2kGv");
NSLog(@"VjLoNCOm092wygn6JqP");
NSLog(@"HJ97MhKPNVO56Cm13ngjiTUdwBck");
NSLog(@"T9Mr8tVkZB7CNUzLa");
NSLog(@"A3qV6dmnZhbLgaiTc0FJWytIv8N5OHj7r2");
NSLog(@"GTsRHwzmjyn8o");
NSLog(@"JAKBYnvwIkf");
NSLog(@"afpVM6HDCnrY75OUGW0");
NSLog(@"towheOJavKVcdzTPQLU8bjsZMl1Dg3u2XN5mY");
NSLog(@"1kvZYRWEo2U74QIVH");
NSLog(@"eGstvjCgI4D2VbiBUmd5QE9hcHK0");
}
-(void)aonAITV:(UITableView*) aonAITV a98hO:(UIColor*) a98hO aRdzohP:(UILabel*) aRdzohP azEs3XHU:(UITableView*) azEs3XHU aXa9ulWMHI:(UIApplication*) aXa9ulWMHI aupFg6:(UIImageView*) aupFg6 aGsre1:(UIControlEvents*) aGsre1 awYD86yB5s:(UITableView*) awYD86yB5s aRCyj:(UIAlertView*) aRCyj aAeIMdt7Y:(UIEvent*) aAeIMdt7Y aKmyeG:(UIBezierPath*) aKmyeG arDRMLX39cK:(UIFont*) arDRMLX39cK anJ0KI2ND4:(UIApplication*) anJ0KI2ND4 avbHuZ:(UISearchBar*) avbHuZ aAN9Ykl:(UIControlEvents*) aAN9Ykl awtinNC:(UIMenuItem*) awtinNC au0lv1mZEeX:(UIAlertView*) au0lv1mZEeX azJVEgOr:(UIAlertView*) azJVEgOr auXfrpZ:(UIRegion*) auXfrpZ aals1NKTAG:(UIKeyCommand*) aals1NKTAG {
NSLog(@"qYdxhFrXyiSIUg58V4EsD0QWujc6Gbz2HnaCo");
NSLog(@"Qprj2HLseD");
NSLog(@"QHvnr6fscRlIp9");
NSLog(@"CDlRJFqT6KnN4LhQt");
NSLog(@"PzDUjmvao675ftJCYbGTVWRhpAN");
NSLog(@"xdw4Agno79OPtilTcJY2N0eyKIHvjG");
NSLog(@"j0KOtcQoy5mugNhrAWapI");
NSLog(@"k947eQfOcjIlbKVPi");
NSLog(@"dYVzPCEUMNkLc0hBjZir5T4H9gnfKu3WRpIqty");
NSLog(@"DFuBYLNhHVb5mxUtgTJi90COqG7ErQf3Pcs");
NSLog(@"bXsG3LuRtUBH5n9wFWKJraDPg78zjT");
NSLog(@"o01yfrNJ3TEOD2cHaXRLsqMwkmUlPZVjYzG5QA8I");
NSLog(@"0Gw6fSEYKMBy3");
}
-(void)aqQCRtk6rK4:(UIView*) aqQCRtk6rK4 a1lpx:(UIDocument*) a1lpx a58oqe:(UIFontWeight*) a58oqe aQNMLVB:(UIFont*) aQNMLVB afJTb2jK:(UIDocument*) afJTb2jK a5kOU:(UIFont*) a5kOU aey3uN:(UIUserInterfaceIdiom*) aey3uN aNOmPSo8uh:(UIBarButtonItem*) aNOmPSo8uh a5aG8RfFl:(UITableView*) a5aG8RfFl aAdfX:(UIImage*) aAdfX aLNabn:(UIUserInterfaceIdiom*) aLNabn {
NSLog(@"2TNysO3IfSHuJDxba45LiY7MzroGdW8AQmRlp");
NSLog(@"GSYvlLrFHqEcMmbC71I4p90fKUeaBy3P");
NSLog(@"lMn8tCj7qkG");
NSLog(@"HnBvDytFJzEbk36QU7Xgu4le");
NSLog(@"VApS82fmFIsWHtk3U");
NSLog(@"ucZayEsTkfS5");
NSLog(@"vyLfbqHM8lsKWSBjRFprn");
NSLog(@"jrFEetm7g2Ad3PpNvLM50qlTuDsz4BK6");
NSLog(@"SAmfCuhlope729RdLk3qr");
NSLog(@"dNx5ngZyOzfpFiQCVjIJhHUA7XuM8c219lb6qLE");
}
-(void)asPQUGh:(UIRegion*) asPQUGh auaRFw9D:(UIBarButtonItem*) auaRFw9D aXwfTrj:(UIEdgeInsets*) aXwfTrj aC36TZ:(UIWindow*) aC36TZ aBZfuDW7:(UIColor*) aBZfuDW7 ar3Anfav:(UIActivity*) ar3Anfav aBDAyQe:(UICollectionView*) aBDAyQe asUSvq3Dlgw:(UIEvent*) asUSvq3Dlgw aLkR2Q:(UIFontWeight*) aLkR2Q aaLEHjq:(UISwitch*) aaLEHjq awfId5ln9V:(UILabel*) awfId5ln9V aQpmRFZO:(UIApplication*) aQpmRFZO a3v5nXY:(UIMenuItem*) a3v5nXY aEVdC:(UIViewController*) aEVdC a8UIcy:(UIMenuItem*) a8UIcy at6PK:(UILabel*) at6PK {
NSLog(@"2boQtCadxBpSOT5GF");
NSLog(@"wQ0moNt9qFJaB");
NSLog(@"J7f41V3zbtuT2BYQ6d");
NSLog(@"2KDEkwoHUeZ3m758b0vA4BpcduOQ");
NSLog(@"xv0lyqfst1PJS");
NSLog(@"6hR38ApQds0X97VygHGLfNMKrbqUPnJDue4EOBc");
NSLog(@"wU7YvAHTIOk3QLEWhZuoNVbF59dicD481");
NSLog(@"T7qknWr0Xm");
NSLog(@"Vzu0oW7YIEBvRPpx5Dgbw2sM1miSZT8fNOejc6");
NSLog(@"T5N6Weqn2LcUkAyamrgHtw87sKO1lBVf");
NSLog(@"JQbzoIj48xEkuypvGBesFfOm502XWSdqt6gahcr");
}
-(void)aoiBpXyOYh:(UIEdgeInsets*) aoiBpXyOYh aBHVD:(UIEdgeInsets*) aBHVD a4lOgh78SQC:(UIFontWeight*) a4lOgh78SQC ambdNxnTJ:(UIAlertView*) ambdNxnTJ aWpcR5U:(UIWindow*) aWpcR5U a1hv2FqzB:(UIBarButtonItem*) a1hv2FqzB aiXxhf3DZ8:(UIActivity*) aiXxhf3DZ8 {
NSLog(@"B6KocPmS9O0QYENUvA4GTjfrHCD85ax7zy");
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NSLog(@"J6xdIwsguhcUMo40GjfzLnCF");
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NSLog(@"edVIZ0ymi53Hb7Jg6sMToc");
NSLog(@"SAW62b0UgGC4vLONrw");
NSLog(@"VyxFkHUtuOPsq64ej7zMQ");
NSLog(@"8eysdaw0uYOmhQtAc6FDjW");
NSLog(@"ejO1u4mkFgzI6PhrUqEKZMAtNvlofVL");
NSLog(@"isMJQdtnASNl2kuZeDvhyzPaxmBGR9C");
NSLog(@"LQPkSca1pq4WR3ezs9ubBN68JGDov0gnxdhrOH");
NSLog(@"GUmZg5CPaLI0Tr8vp2RVlO");
NSLog(@"lbSCkcEZ2mOPiAXfTYr7BvnN08gwKuxURLh6tFV");
NSLog(@"EiTqd5nWQhtg1j2KaLbBCysYoD");
}
-(void)aJPLdbA:(UISearchBar*) aJPLdbA aAHEdPg:(UIFontWeight*) aAHEdPg a4h7RlJWAu:(UIColor*) a4h7RlJWAu a715Vr:(UIActivity*) a715Vr atcb4kjJ:(UIApplication*) atcb4kjJ am9n8R7c:(UIControlEvents*) am9n8R7c aW7lRVDef:(UILabel*) aW7lRVDef aF4lwat:(UIKeyCommand*) aF4lwat a58ZlOBQd:(UIEvent*) a58ZlOBQd aK2zTRDcqem:(UIImageView*) aK2zTRDcqem aEmYD:(UIMenuItem*) aEmYD aS3oncPO:(UIControlEvents*) aS3oncPO a8ck54O:(UIApplication*) a8ck54O a42cn67Heza:(UIDevice*) a42cn67Heza aMcdEtNx:(UIWindow*) aMcdEtNx aD6x3uVG8T:(UICollectionView*) aD6x3uVG8T anMTP3Xu:(UICollectionView*) anMTP3Xu aU6v3ui0est:(UIBarButtonItem*) aU6v3ui0est ar38Z:(UISwitch*) ar38Z ahXcavJTC2:(UIActivity*) ahXcavJTC2 {
NSLog(@"3lFt9hmvN5IxYL");
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NSLog(@"siB90RfoXU41mOnV2uG5EDSKkIJZv");
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NSLog(@"aUxXpstPLZKr9lIQ7j2GwF");
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NSLog(@"nb5rkS8eXKZ9M1ElUog0puyfDLJ");
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NSLog(@"EPFuCwLmtpnr4AOoXNseZ");
}
-(void)asltT8Mb:(UIMotionEffect*) asltT8Mb abfXAB5ma:(UIScreen*) abfXAB5ma aoLVm8rdwX:(UIEdgeInsets*) aoLVm8rdwX a7NqpvFnOa:(UIButton*) a7NqpvFnOa aq2JOKW:(UIInputView*) aq2JOKW aJoeVK6:(UIImage*) aJoeVK6 aLql7IOsVU:(UIApplication*) aLql7IOsVU apXrDjAE:(UIImage*) apXrDjAE aCqyhrW:(UIFont*) aCqyhrW aBhmk2lCgO:(UIEdgeInsets*) aBhmk2lCgO aghtYeEjD0s:(UIImage*) aghtYeEjD0s aLhJXj2n:(UIVisualEffectView*) aLhJXj2n atl0j:(UIDocument*) atl0j a12Bem:(UIControlEvents*) a12Bem aw3pnAko:(UIDocument*) aw3pnAko auqSRzZlAf:(UIControl*) auqSRzZlAf {
NSLog(@"gR1VqdbOSnsuEyLioaWJ38Ih0KZHjQ");
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NSLog(@"sdnU4N2IbTyXSQRxaAvl7FBHGjpPhfmZo98cJ");
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NSLog(@"rHklcoSEizfhCwtIOGvAD3q4N9");
NSLog(@"ckD4rolUaOMwymS3ziG8IAfjJVLn");
NSLog(@"NiUCz0VLOab4kXmFt7HjsZQPdRpvx5YWKc");
NSLog(@"QwumNdkzTCpyUt2JEKB5HGvSh0LrDAV1IW");
NSLog(@"0rNRedh1XcJ6xmOlzgabT");
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NSLog(@"nZbIGdlLeyw5a0Tu7");
NSLog(@"muipZHrUgsB");
NSLog(@"3E7XqYbWAQZ");
NSLog(@"GdwcMQEby14TLunB8h0U2vr5fPlsjIFWkAC6");
NSLog(@"b3CrTXnOjtSHG0gkFMyP8uJRpV7E495NefvW");
NSLog(@"1mULxZABPlvkycV");
}
@end