CSStickyHeaderFlowLayout/Project/CSStickyHeaderFlowLayoutDemo/CSGrowHeaderViewController.m at master · DevQC/CSStickyHeaderFlowLayout · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
//
//  CSGrowHeaderViewController.m
//  CSStickyHeaderFlowLayoutDemo
//
//  Created by James Tang on 13/2/14.
//  Copyright (c) 2014 Jamz Tang. All rights reserved.
//

#import "CSGrowHeaderViewController.h"
#import "CSCell.h"
#import "CSSectionHeader.h"
#import "CSStickyHeaderFlowLayout.h"

@interface CSGrowHeaderViewController ()

@property (nonatomic, strong) NSArray *sections;
@property (nonatomic, strong) UINib *headerNib;

@end

@implementation CSGrowHeaderViewController


- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        self.sections = @[
                          @{@"Twitter":@"http://twitter.com"},
                          @{@"Facebook":@"http://facebook.com"},
                          @{@"Tumblr":@"http://tumblr.com"},
                          @{@"Pinterest":@"http://pinterest.com"},
                          @{@"Instagram":@"http://instagram.com"},
                          @{@"Github":@"http://github.com"},
                          ];

        self.headerNib = [UINib nibWithNibName:@"CSGrowHeader" bundle:nil];
    }
    return self;
}

- (void)viewDidLoad
{
    [super viewDidLoad];

    [self reloadLayout];
    // Also insets the scroll indicator so it appears below the search bar
    self.collectionView.scrollIndicatorInsets = UIEdgeInsetsMake(44, 0, 0, 0);

    [self.collectionView registerNib:self.headerNib
          forSupplementaryViewOfKind:CSStickyHeaderParallaxHeader
                 withReuseIdentifier:@"header"];

}

- (void)willAnimateRotationToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation duration:(NSTimeInterval)duration {
    [self reloadLayout];
}

- (void)reloadLayout {
    CSStickyHeaderFlowLayout *layout = (id)self.collectionViewLayout;

    if ([layout isKindOfClass:[CSStickyHeaderFlowLayout class]]) {
        layout.parallaxHeaderReferenceSize = CGSizeMake(self.view.frame.size.width, 200);
        layout.itemSize = CGSizeMake(self.view.frame.size.width, layout.itemSize.height);
        // If we want to disable the sticky header effect
        layout.disableStickyHeaders = YES;
    }
}

#pragma mark UICollectionViewDataSource

- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView {
    return [self.sections count];
}

- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section {
    return 1;
}

- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath {

    NSDictionary *obj = self.sections[indexPath.section];

    CSCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:@"cell"
                                                             forIndexPath:indexPath];

    cell.textLabel.text = [[obj allValues] firstObject];

    return cell;
}

- (UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath {
    if ([kind isEqualToString:UICollectionElementKindSectionHeader]) {

        NSDictionary *obj = self.sections[indexPath.section];

        CSSectionHeader *cell = [collectionView dequeueReusableSupplementaryViewOfKind:kind
                                                          withReuseIdentifier:@"sectionHeader"
                                                                 forIndexPath:indexPath];

        cell.textLabel.text = [[obj allKeys] firstObject];

        return cell;
    } else if ([kind isEqualToString:CSStickyHeaderParallaxHeader]) {
        UICollectionReusableView *cell = [collectionView dequeueReusableSupplementaryViewOfKind:kind
                                                                            withReuseIdentifier:@"header"
                                                                                   forIndexPath:indexPath];

        return cell;
    }
    return nil;
}


@end