UICollectionview控件学习

UICollectionView 和 UICollectionViewController 类是iOS6 新引进的API，用于展示集合视图，布局更加灵活，可实现多列布局，用法类似于UITableView 和 UITableViewController 类。

使用UICollectionView 必须实现UICollectionViewDataSource,UICollectionViewDelegate,UICollectionViewDelegateFlowLayout这三个协议。

#import <UIKit/UIKit.h>@interface ZYTMoreAppViewController : UIViewController<UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout>{    IBOutlet UICollectionView *appCollectionView;      NSMutableArray *appArray;}@end

<pre name="code" class="objc"><pre name="code" class="objc">//使用NSPredicate类 筛选需要的对象-(void) loadData{    NSString *plistPath = [[NSBundle mainBundle] pathForResource:@"AppInfo" ofType:@"plist"];    NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:plistPath];    NSArray *array = [data valueForKey:@"applist"];    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"status == %@", @"0"];    NSArray *filterArray = [array filteredArrayUsingPredicate:predicate];    for (NSDictionary *dic in filterArray) {        [appArray addObject:dic];    }    NSLog(@"test : %@", appArray);    [appCollectionView reloadData];}//定义每个UICollectionView 的大小- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{    return CGSizeMake(70, 92);}//定义每个UICollectionView 的 margin-(UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{    return UIEdgeInsetsMake(5, 5, 5, 5);}//定义展示的UICollectionViewCell的个数- (NSInteger) collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{    NSLog(@"appArray count : %d", [appArray count]);    return [appArray count];}//每个UICollectionView展示的内容- (ZYTAppCollectionCell *) collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{    static NSString * CellIdentifier = @"ZYTAppCollectionCell";    ZYTAppCollectionCell * appCell = (ZYTAppCollectionCell *)[collectionView dequeueReusableCellWithReuseIdentifier:CellIdentifier forIndexPath:indexPath];    NSDictionary *dic = [appArray objectAtIndex:indexPath.row];    [appCell.appIcon setImage:[UIImage imageNamed:[dic valueForKey:@"app_icon"]]];    [appCell.appName setText:[dic valueForKey:@"app_name"]];    return appCell;}//UICollectionView被选中时调用的方法- (void) collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{    NSDictionary *dic = [appArray objectAtIndex:indexPath.row];    SEL click = NSSelectorFromString([dic valueForKey:@"app_click"]);    [self performSelector:click withObject:nil afterDelay:0.f];}