[ios]如何分组具有 UICollectionReusableView (使用 JSON) 的单元格
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我填充一个 Rails 应用程序 (http://obscure-lake-7450.herokuapp.com/upcoming.json) 从 JSON 与我的应用程序。在我的 Rails 应用程序中的每一个岗位有"发布日期",和他们按 (基本上每个星期有释放某些运动鞋) 发布日期分组。我想要能做同样的事情在我的应用程序,但很难做的。
我的演示图板上有一个集合可重用视图与 UICollectionReusableView 类和标识符称为"releasesGroup",我也有一个连接到 UICollectionReusableView 称为"releasesHeader"的标签。
我也想要显示对应的日期在页眉中,像这样:
视图控制器
- (void)viewDidLoad{ [super viewDidLoad]; NSURL *upcomingReleaseURL = [NSURL URLWithString:@"http://obscure-lake-7450.herokuapp.com/upcoming.json"]; NSData *jsonData = [NSData dataWithContentsOfURL:upcomingReleaseURL]; NSError *error = nil; NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error]; self.upcomingReleases = [NSMutableArray array]; NSArray *upcomingReleasesArray = [dataDictionary objectForKey:@"upcoming_releases"]; for (NSDictionary *upcomingReleaseDictionary in upcomingReleasesArray) { UpcomingRelease *upcomingRelease = [UpcomingRelease upcomingReleaseWithName:[upcomingReleaseDictionary objectForKey:@"release_name"]]; upcomingRelease.release_date = [upcomingReleaseDictionary objectForKey:@"release_date"]; [self.upcomingReleases addObject:upcomingRelease]; } [self.collectionView registerClass:[UpcomingReleaseCell class] forCellWithReuseIdentifier:@"UpcomingReleaseCell"];}- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{ return 1;}- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section { return [self.upcomingReleases count];}- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { static NSString *identifier = @"Cell"; UpcomingReleaseCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath]; UpcomingRelease *upcomingRelease = [self.upcomingReleases objectAtIndex:indexPath.row]; cell.release_name.text = upcomingRelease.release_name; return cell;}
我的 UICollectionReusableView
@interface ReleasesGroup : UICollectionReusableView@property (weak, nonatomic) IBOutlet UILabel *releasesHeader;@end@implementation ReleasesGroup- (id)initWithFrame:(CGRect)frame{ self = [super initWithFrame:frame]; if (self) { // Initialization code } return self;}@end
谢谢你。
编辑:
我的继续
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender{ if ([[segue identifier] isEqualToString:@"showRelease"]) { NSIndexPath *selectedIndexPath = [[self.collectionView indexPathsForSelectedItems] objectAtIndex:0]; ReleaseViewController *releaseViewController = [segue destinationViewController]; releaseViewController.singleRelease = self.upcomingReleases[selectedIndexPath.row]; }}
ReleaseViewController.h
#import <UIKit/UIKit.h>#import "UpcomingRelease.h"@interface ReleaseViewController : UIViewController@property (strong, nonatomic) UpcomingRelease *singleRelease;@property (weak, nonatomic) IBOutlet UILabel *release_name;@property (weak, nonatomic) IBOutlet UILabel *release_price;@property (weak, nonatomic) IBOutlet UILabel *release_colorway;@property (weak, nonatomic) IBOutlet UILabel *release_date;@property (weak, nonatomic) IBOutlet UIImageView *thumb;@end
ReleaseViewController.m
#import "ReleaseViewController.h"@interface ReleaseViewController ()@end@implementation ReleaseViewController@synthesize singleRelease = _singleRelease;@synthesize release_name = _release_name;@synthesize release_price = _release_price;@synthesize release_colorway = _release_colorway;@synthesize release_date = _release_date;@synthesize thumb = _thumb;- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil{ self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil]; if (self) { // Custom initialization } return self;}- (void)viewDidLoad{ [super viewDidLoad]; NSString *thumbURL = nil; if ([_singleRelease.images isKindOfClass:[NSArray class]] && [_singleRelease.images count]) thumbURL = [[[[[_singleRelease.images objectAtIndex:0] objectForKey:@"image_file"] objectForKey:@"image_file"] objectForKey:@"medium"] objectForKey:@"url"]; if (thumbURL) { NSData *imageData = [NSData dataWithContentsOfURL:[NSURL URLWithString:thumbURL]]; UIImage *image = [UIImage imageWithData:imageData]; self.thumb.image = image; } else { self.thumb.image = [UIImage imageNamed:@"cover.png"]; } self.release_name.text = self.singleRelease.release_name; self.release_price.text = [NSString stringWithFormat:@"$%@", _singleRelease.release_price]; self.release_colorway.text = self.singleRelease.release_colorway; self.release_date.text = [NSString stringWithFormat:@"%@", _singleRelease.formattedDate];}- (void)didReceiveMemoryWarning{ [super didReceiveMemoryWarning]; // Dispose of any resources that can be recreated.}@end
解决方法 1:
好的它会出现您错过了不少事。首先: 要组由天发布,你将需要某种日期操纵,在 viewDidLoad 方法中,你将需要已分组的 json 数据到"水桶"对应的发布日期。一旦您有这,剩下的就一块蛋糕。所以放到它上面:
首先,你需要一个属性在您的视图控制器包含的所有数据。就像这样:
@property (strong, nonatomic) NSDictionary *upReleases;@property (strong, nonatomic) NSArray *releaseBuckets;
然后,在你 viewDidLoad
方法,您会需要填充这本词典:
- (void)viewDidLoad{ [super viewDidLoad]; NSURL *upcomingReleaseURL = [NSURL URLWithString:@"http://obscure-lake-7450.herokuapp.com/upcoming.json"]; NSData *jsonData = [NSData dataWithContentsOfURL:upcomingReleaseURL]; NSError *error = nil; NSDictionary *dataDictionary = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:&error]; NSArray *upcomingReleasesArray = [dataDictionary objectForKey:@"upcoming_releases"]; //This is the dateFormatter we'll need to parse the release dates NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"yyyy-MM-dd'T'HH:mm:ss.SSSv"]; NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT"]; [dateFormatter setTimeZone:gmt]; [dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_GB"]]; //A bit of an overkill to avoid bugs on different locales //Temp array where we'll store the unsorted bucket dates NSMutableArray *buckets = [[NSMutableArray alloc] init]; NSMutableDictionary *tmpDict = [[NSMutableDictionary alloc] init]; for (NSDictionary *upcomingReleaseDictionary in upcomingReleasesArray) { //We find the release date from the string NSDate *releaseDate = [dateFormatter dateFromString:[upcomingReleaseDictionary objectForKey:@"release_date"]]; //We create a new date that ignores everything that is not the actual day //(ignoring stuff like the time of the day) NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; NSDateComponents *components = [gregorian components:(NSDayCalendarUnit | NSMonthCalendarUnit | NSYearCalendarUnit) fromDate:releaseDate]; //This will represent our releases "bucket" NSDate *bucket = [gregorian dateFromComponents:components]; //We get the existing objects in the bucket and update it with the latest addition NSMutableArray *releasesInBucket = [tmpDict objectForKey:bucket]; if (!releasesInBucket){ releasesInBucket = [NSMutableArray array]; [buckets addObject:bucket]; } UpcomingRelease *upcomingRelease = [UpcomingRelease upcomingReleaseWithName:[upcomingReleaseDictionary objectForKey:@"release_name"]]; upcomingRelease.release_date = [upcomingReleaseDictionary objectForKey:@"release_date"]; [releasesInBucket addObject:upcomingRelease]; [tmpDict setObject:releasesInBucket forKey:bucket]; } [buckets sortUsingComparator:^NSComparisonResult(id obj1, id obj2) { NSDate* date1 = obj1; NSDate* date2 = obj2; //This will sort the dates in ascending order (earlier dates first) return [date1 compare:date2]; //Use [date2 compare:date1] if you want an descending order }]; self.upReleases = [NSDictionary dictionaryWithDictionary:tmpDict]; self.releaseBuckets = [NSArray arrayWithArray:buckets];}
下一步,您需要有尽可能多的部分作为释放存储桶。一块蛋糕:
-(NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{ return [self.releaseBuckets count];}
许多单元格每桶作为被释放在该日期的产品:
-(NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{ return [[self.upReleases objectForKey:self.releaseBuckets[section]] count];}
然后,您需要设置每节 (再次,一点点的操纵有必要你页眉节的正确格式的日期) 的标头:
-(UICollectionReusableView *)collectionView:(UICollectionView *)collectionView viewForSupplementaryElementOfKind:(NSString *)kind atIndexPath:(NSIndexPath *)indexPath{ ReleasesGroup* releaseGroup = [collectionView dequeueReusableSupplementaryViewOfKind:UICollectionElementKindSectionHeader withReuseIdentifier:@"releasesGroup" forIndexPath:indexPath]; //We tell the formatter to produce a date in the format "Name-of-the-month day" NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; [dateFormatter setDateFormat:@"MMMM dd"]; NSTimeZone *gmt = [NSTimeZone timeZoneWithAbbreviation:@"GMT"]; [dateFormatter setTimeZone:gmt]; [dateFormatter setLocale:[[NSLocale alloc] initWithLocaleIdentifier:@"en_GB"]]; //We read the bucket date and feed it to the date formatter NSDate* bucketDate = self.releaseBuckets[indexPath.section]; releaseGroup.releasesHeader.text = [[dateFormatter stringFromDate:bucketDate] uppercaseString]; return releaseGroup;}
最后,您需要安装的单个单元格:
- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath { static NSString *identifier = @"Cell"; UpcomingReleaseCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:identifier forIndexPath:indexPath]; UpcomingRelease *upcomingRelease = [self.upReleases objectForKey:self.releaseBuckets[indexPath.section]][indexPath.row]; cell.release_name.text = upcomingRelease.release_name; return cell;}
这整个代码已测试及工程。
编辑要包含已排序的数组的键
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