UICollectionView请求网络数据显示(Text)

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TEXT:

AppDelegate.m

    self.window.rootViewController = [[[UINavigationController alloc]initWithRootViewController:[RootViewController new]]autorelease];

RootViewController.m

#import "RootViewController.h"#import "ImageCell.h"#import "ImageURL.h"#define kImageCell @"imagecell"@interface RootViewController ()<UICollectionViewDataSource>@property(nonatomic,retain)NSMutableArray *dataSource;//存储model对象@end

//释放- (void)dealloc{    self.dataSource = nil;    [super dealloc];}//懒加载- (NSMutableArray *)dataSource{        if (_dataSource == nil) {        self.dataSource = [NSMutableArray arrayWithCapacity:0];    }    return [[_dataSource retain]autorelease];}

- (void)viewDidLoad {    [super viewDidLoad];    self.view.backgroundColor = [UIColor whiteColor];    //调用配置CollectionView    [self confgureCollectionView];    //调用解析    [self readDataFromFile];    }

解析数据：

- (void)readDataFromFile{    //获取文件的路径    NSString *filePath = [[NSBundle mainBundle]pathForResource:@"Data.json" ofType:nil];    //使用文件的初始化NSData对象    NSData *data = [NSData dataWithContentsOfFile:filePath];    //使用json解析 NSMutableArray *sourceArray =  [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingMutableContainers  error:nil];//    NSLog(@"%@",sourceArray);    //遍历字典    for (NSDictionary *dic in sourceArray) {        //创建model对象        ImageURL *URL = [[ImageURL alloc]init];        //添加到model        [URL setValuesForKeysWithDictionary:dic];        //添加到数组        [self.dataSource addObject:URL];        NSLog(@"%@",self.dataSource);            }}

配置CollectionView

//配置CollectionView- (void)confgureCollectionView{    //创建布局工具    UICollectionViewFlowLayout *flowLayout = [[UICollectionViewFlowLayout alloc]init];    //设置item的大小    flowLayout.itemSize = CGSizeMake(140, 160);    //设置分区缩进量    flowLayout.sectionInset = UIEdgeInsetsMake(5, 10, 5, 10);        //创建CollectionView对象    UICollectionView *collectionView = [[UICollectionView alloc]initWithFrame:[UIScreen mainScreen].bounds collectionViewLayout:flowLayout];    //配置数据源代理    collectionView.dataSource = self;    //注册cell    [collectionView registerClass:[ImageCell class] forCellWithReuseIdentifier:kImageCell];    //设置背景颜色    collectionView.backgroundColor = [UIColor whiteColor];          //添加到父视图上    [self.view addSubview:collectionView];    [collectionView release];    [flowLayout release];    }

#pragma mark 数据源代理方法

//返回分区个数- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{        return self.dataSource.count;    }- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{    ImageCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:kImageCell forIndexPath:indexPath];    //根据item的下标取出对应位置的数据    ImageURL *url = self.dataSource[indexPath.item];    //调用cell控件赋值的方法    [cell assignValueByImageURL:url];        return cell;}

自定义cell：

<span style="font-size:24px;">//ImageCell.h#import <UIKit/UIKit.h>@class ImageURL;@interface ImageCell : UICollectionViewCell//写一个方法给cell上控件赋值- (void)assignValueByImageURL : (ImageURL *)image;@end//ImageCell.m#import "ImageCell.h"#import "UIImageView+WebCache.h"#import "ImageURL.h"@interface ImageCell ()@property(nonatomic,retain)UIImageView *photoView;@end@implementation ImageCell- (void)dealloc{    self.photoView = nil;    [super dealloc];}- (id)initWithFrame:(CGRect)frame{    if (self = [super initWithFrame:frame]) {                [self.contentView addSubview:self.photoView];        }    return self;}- (UIImageView *)photoView{        if (_photoView == nil) {        self.photoView = [[UIImageView alloc]initWithFrame:self.bounds];        self.photoView.backgroundColor = [UIColor cyanColor];                    }    return [[_photoView retain]autorelease];    }//写一个方法给cell上控件赋值- (void)assignValueByImageURL : (ImageURL *)image{    //1.使用图片异步加载    [self.photoView sd_setImageWithURL:[NSURL URLWithString:image.thumbURL] placeholderImage:[UIImage imageNamed:@"占位1"]];}@end</span>

建一个model数据类：

<span style="font-size:24px;">//ImageURL.h@interface ImageURL : NSObject@property(nonatomic,copy)NSString *thumbURL;@end//ImageURL.m#import "ImageURL.h"@implementation ImageURL- (void)dealloc{    self.thumbURL= nil;    [super dealloc];}//防止Crash- (void)setValue:(id)value forUndefinedKey:(NSString *)key{}@end</span>

效果展示：

图片占位：

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Data文件下载：http://pan.baidu.com/s/1ntw5W3f

本节知识点：http://blog.csdn.net/qq_31810357/article/details/49154985

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