由于沒有用過collectionview,也是剛開始純代碼布局铜异,所以查了很多資料和問了一些朋友哥倔,總算解決問題
在vc里用到了另外的一些分類,如有需要歡迎追問揍庄,互相學(xué)習(xí)咆蒿。歡迎大神指點
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步驟:
? 1.自定義collectionviewCell類
??2.模型類 ?
? 3. 在一個UIViewController里添加一個collectionView
第一步:自定義cell
在cell的.h 里:
#import#import "LocalWorkModel.h"
NS_ASSUME_NONNULL_BEGIN
@class LocalWorkCell;
typedef void(^CellSelectedHander)(LocalWorkCell * cell,BOOL isSelected);
@interface LocalWorkCell : UICollectionViewCell
/** model */
@property(nonatomic,strong)LocalWorkModel *model;
/** 選中圖片 */
@property(nonatomic,strong)UIImageView *selectedImage;
/// 點擊進(jìn)行的回調(diào)
@property (nonatomic, copy)CellSelectedHander selectedHandler;
/// 表示選中
- (void)didSelected;
@end
在cell的.m 里:
#import "LocalWorkCell.h"
@interface LocalWorkCell ()
//圖片
@property(nonatomic,weak) UIImageView? *imageView;
@end
@implementation LocalWorkCell
//通過純代碼的方式創(chuàng)建此類實例 會調(diào)用該方法? 在此方法中,添加子控件
- (instancetype)initWithFrame:(CGRect)frame{
if(self = [super initWithFrame:frame]){
UIImageView *imageView = [[UIImageView alloc] init];
[self addSubview:imageView];
self.imageView = imageView;
//選中cell的圖片
UIImageView *selectedImage = [[UIImageView alloc]init];
[self addSubview:selectedImage];
self.selectedImage = selectedImage;
self.selectedImage.hidden = YES;
}
return self;
}
//當(dāng)子控件發(fā)生變化(包括子控件增減和位置大小改變)時,都會調(diào)用此方法 來重新布局所有子控件
- (void)layoutSubviews{
[super layoutSubviews];
//設(shè)置 imageView 的 frame
//? ? CGFloat imageViewX = 10;
//? ? CGFloat imageViewY = 0;
//? ? CGFloat imageViewW = self.cc_w - 2 * imageViewX;
//? ? CGFloat imageViewH = imageViewW;
self.imageView.frame = CGRectMake(0, 0, self.cc_w + 5 , self.cc_h);
self.selectedImage.frame = self.imageView.frame;
}
//設(shè)置子控件的內(nèi)容
-(void)setModel:(LocalWorkModel *)model{
_model = model;
self.imageView.image = [UIImage imageNamed:model.icon];
self.selectedImage.image = [UIImage imageNamed:@"cover_ selected"];
}
-(void)didSelected
{
self.selectedImage.hidden = !self.selectedImage.hidden;
if (self.selectedHandler) {
self.selectedHandler(self,!self.selectedImage.hidden);//已經(jīng)隱藏表示需要移除
}
}
@end
第二步:模型類
在模型類的.h:
#import@interface LocalWorkModel : NSObject
//名稱
@property(nonatomic,copy)NSString *name;
//圖片
@property(nonatomic,copy)NSString *icon;
//快速創(chuàng)建實例
+ (instancetype)appWithDict:(NSDictionary *)dict;
@end
模型類的.m:
#import "LocalWorkModel.h"
@implementation LocalWorkModel
+ (instancetype)appWithDict:(NSDictionary *)dict{
//這樣寫會通用 可以把這個 作為代碼塊了
id obj = [[self alloc] init];
[obj setValuesForKeysWithDictionary:dict];
return obj;
}
@end
第三步:在一個UIViewController里添加一個collectionView
在.h里沒有代碼蚂子,所以直接.m:
#import "LocalWorkVC.h"
#import "UIBarButtonItem+Extension.h"
#import "LocalWorkCell.h"
#import "LocalWorkModel.h"
#import "PlayLocalVideoVC.h"
static NSString *ID = @"LocalWorkcell";
@interface LocalWorkVC ()@property(nonatomic,strong)UICollectionView *collectionview;
@property(nonatomic,strong)UICollectionViewFlowLayout *flowLayout;
/** 數(shù)組 */
@property(nonatomic,strong)NSMutableArray *models;
/** 操作本地數(shù)據(jù)的VIEW */
@property(nonatomic,strong)UIView *operationDataView;
@property(nonatomic,strong)UIButton *deleteButton;
//選中cell的圖片獲取
/** cell */
@property(nonatomic,strong)LocalWorkCell *selectedCellImage;
/// 表示選中的cache
@property (nonatomic, strong)NSMutableSet * cacheSet;
@end
@implementation LocalWorkVC
- (void)viewDidLoad {
[super viewDidLoad];
[self setupUI];
[self setupnavigation];
}
-(void)setupUI{
//1.創(chuàng)建 UICollectionView 實例
//1.1創(chuàng)建流水布局
UICollectionViewFlowLayout *layout = [[UICollectionViewFlowLayout alloc] init];
//? ? layout.itemSize = CGSizeMake(150, 150);
//1.2通過流水布局創(chuàng)建UICollectionView
UICollectionView *collectionView = [[UICollectionView alloc] initWithFrame:CGRectMake(0, 0, kScreenWidth, kScreenHeight-64) collectionViewLayout:layout];
//1.3設(shè)置UICollectionView的背景色
collectionView.backgroundColor = [UIColor whiteColor];
//1.4設(shè)置數(shù)據(jù)源
collectionView.dataSource = self;
collectionView.delegate = self;
//1.5添加到View中
[self.view addSubview:collectionView];
//1.6設(shè)置為全局變量
self.collectionview = collectionView;
//3 注冊cell
[self.collectionview registerClass:[LocalWorkCell class] forCellWithReuseIdentifier:ID];
//彈出底部view
UIWindow *window = [UIApplication sharedApplication].keyWindow;
[window addSubview:self.operationDataView];
[self.operationDataView mas_makeConstraints:^(MASConstraintMaker *make) {
make.left.equalTo(0);
make.right.equalTo(0);
make.bottom.equalTo(0);
make.height.equalTo(44);
}];
self.operationDataView.hidden = YES;
//刪除delete
[self.operationDataView addSubview:self.deleteButton];
[self.deleteButton mas_makeConstraints:^(MASConstraintMaker *make) {
make.top.bottom.right.left.equalTo(0);
}];
//collection
[self.view addSubview:_collectionview];
//初始化模擬數(shù)據(jù)源
self.cacheSet = [NSMutableSet set];
}
-(void)setupnavigation{ ? ? ?self.title = @"本地作品";? ? self.navigationController.navigationBar.titleTextAttributes = @{NSForegroundColorAttributeName : [CCTools stringToColor:@"#333333"]};? ? //導(dǎo)航欄右邊按鈕沃测,系統(tǒng)的不能修改,自己寫個按鈕上去? ? UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"選擇" style:UIBarButtonItemStylePlain target:self action:@selector(navChooseRightButton)];? ? rightButton.tintColor = RGB(51, 51, 51);? ? [rightButton setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIFont fontWithName:@"" size:17.0], NSForegroundColorAttributeName, nil] forState:UIControlStateNormal];? ? self.navigationItem.rightBarButtonItem = rightButton;}-(void)navChooseRightButton{? ? ? ? if ([self.navigationItem.rightBarButtonItem.title isEqualToString:@"選擇"]) {? ? ? ? [self.navigationItem.rightBarButtonItem setTitle:@"取消"];? ? ? ? self.operationDataView.hidden = NO;? ? }else if ([self.navigationItem.rightBarButtonItem.title isEqualToString:@"取消"]){? ? ? ? [self.navigationItem.rightBarButtonItem setTitle:@"選擇"];? ? ? ? self.operationDataView.hidden = YES;? ? ? ? ? ? }? ? }-(void)deleteEvent{? ? DLog(@"事件");? ? [self p_deleteHandler];? ? _deleteButton.userInteractionEnabled = NO;? ? _deleteButton.alpha = 0.4;}#pragma mark - 進(jìn)行刪除操作- (void)p_deleteHandler{? ? //如果沒有選擇缆镣,return? 這里也可以判斷是否有選中的cell? ? if (self.cacheSet.count == 0) {? return;? }? ? ? //獲得無序序列? ? NSArray * indexPaths = self.cacheSet.allObjects;? ? ? ? //變?yōu)橛行? ? NSSortDescriptor * descirptor = [NSSortDescriptor sortDescriptorWithKey:@"row" ascending:true];? ? ? ? NSArray* deleteIndexPath = [indexPaths sortedArrayUsingDescriptors:@[descirptor]];
//逆序刪除數(shù)據(jù)源
for (NSInteger i = deleteIndexPath.count - 1; i >= 0; i--) {
NSInteger row = deleteIndexPath[i].row;
//刪除
[self.models removeObjectAtIndex:row];
}
//刷新collectionView
[self.collectionview deleteItemsAtIndexPaths:deleteIndexPath];
//刪除所有數(shù)據(jù)
[self.cacheSet removeAllObjects];
//返回
//? ? [self.navigationController popViewControllerAnimated:true];
}
-(void)viewWillAppear:(BOOL)animated{
[super viewWillAppear:animated];
[self.navigationController setNavigationBarHidden:NO];
}
- (void)viewWillDisappear:(BOOL)animated{
[super viewWillDisappear:animated];
[self.navigationController setNavigationBarHidden:YES];
}
#pragma mark -2.實現(xiàn)數(shù)據(jù)源方法//2.1 返回多少組- (NSInteger)numberOfSectionsInCollectionView:(UICollectionView *)collectionView{? ? return 1;}//2.2 返回每組有多少item- (NSInteger)collectionView:(UICollectionView *)collectionView numberOfItemsInSection:(NSInteger)section{? ? return self.models.count;}//2.3 返回每個item的cell- (UICollectionViewCell *)collectionView:(UICollectionView *)collectionView cellForItemAtIndexPath:(NSIndexPath *)indexPath{? ? //獲得可重用cell? ? LocalWorkCell *cell = [collectionView dequeueReusableCellWithReuseIdentifier:ID forIndexPath:indexPath];? ? __weak typeof(self) weakSelf = self;? ? //設(shè)置交互回調(diào)? ? cell.selectedHandler = ^(LocalWorkCell * _Nonnull cell,BOOL isSelected) {? ? ? ? ? ? ? ? /********? 使用回調(diào)獲得indexPath? **********/? ? ? ? ? ? ? ? //獲得indexPath? ? ? ? NSIndexPath * index = [weakSelf.collectionview indexPathForCell:cell];? ? ? ? ? ? ? ? if (isSelected) {//表示選中芽突,添加indexPath至Set? ? ? ? ? ? _deleteButton.userInteractionEnabled = YES;? ? ? ? ? ? _deleteButton.alpha = 1.0;? ? ? ? ? ? [weakSelf.cacheSet addObject:index];? ? ? ? }? ? ? ? ? ? ? ? else { //移除? ? ? ? ? ? _deleteButton.userInteractionEnabled = NO;? ? ? ? ? ? _deleteButton.alpha = 0.4;? ? ? ? ? ? [weakSelf.cacheSet removeObject:index];? ? ? ? }? ? };? ? //設(shè)置狀態(tài)? ? cell.selectedImage.hidden = ![self.cacheSet containsObject:indexPath];? ? //給cell設(shè)置數(shù)據(jù)? ? cell.model = self.models[indexPath.item];? ? //返回cell? ? return cell;}//_deleteButton.userInteractionEnabled = NO;//點擊item(cell)方法- (void)collectionView:(UICollectionView *)collectionView didSelectItemAtIndexPath:(NSIndexPath *)indexPath{? ? DLog(@"indexPath= %ld",indexPath.row);? ? ? if ([self.navigationItem.rightBarButtonItem.title isEqualToString:@"選擇"]) {? ? ? ? PUSH_CONTROL(PlayLocalVideoVC);? ? }? ? if ([self.navigationItem.rightBarButtonItem.title isEqualToString:@"取消"]){? ? ? ? //獲得cell? ? ? ? LocalWorkCell * cell = (LocalWorkCell *)[collectionView cellForItemAtIndexPath:indexPath];? ? ? ? ? ? ? ? [cell didSelected];? ? }}- (void)deleteItemsAtIndexPaths:(NSArray*)indexPaths{
[[[UICollectionView alloc] init] deleteItemsAtIndexPaths:@[[NSIndexPath indexPathForItem:0 inSection:0]]];
}
//返回每一個cell的大小
- (CGSize)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout sizeForItemAtIndexPath:(NSIndexPath *)indexPath{
return CGSizeMake(self.collectionview.cc_w / 3 -5, 150);
}
//設(shè)置每個item的UIEdgeInsets? 組內(nèi)邊距
- (UIEdgeInsets)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout *)collectionViewLayout insetForSectionAtIndex:(NSInteger)section{
return UIEdgeInsetsMake(5, 0, 44, 0);
}
//cover_ selected
//設(shè)置最小行間距,也就是前一行與后一行的中間最小間隔? 上下距離
- (CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumLineSpacingForSectionAtIndex:(NSInteger)section{
return 3;
}
// 設(shè)置最小列間距董瞻,也就是左行與右一行的中間最小間隔? 左右距離
-(CGFloat)collectionView:(UICollectionView *)collectionView layout:(UICollectionViewLayout*)collectionViewLayout minimumInteritemSpacingForSectionAtIndex:(NSInteger)section {
return 3;
}
#pragma mark -懶加載
-(NSMutableArray *)models{
if (_models == nil) {
//獲得app.plist的路徑
NSString *path = [[NSBundle mainBundle] pathForResource:@"localWork.plist" ofType:nil];
//加載app.plist中的字典為數(shù)組
NSArray *arr = [NSArray arrayWithContentsOfFile:path];
NSMutableArray *array = [NSMutableArray array];
//字典轉(zhuǎn)模型
for(NSDictionary *dict in arr){
LocalWorkModel *model = [LocalWorkModel appWithDict:dict];
[array addObject:model];
}
_models = array;
}
return _models;
}
-(UIView *)operationDataView{
if (_operationDataView == nil) {
_operationDataView = [[UIView alloc]init];
//? ? ? ? _operationDataView.backgroundColor = [UIColor grayColor];
}
return _operationDataView;
}
-(UIButton *)deleteButton{
if (_deleteButton == nil) {
_deleteButton = [[UIButton alloc]init];
_deleteButton.backgroundColor = [UIColor redColor];
[_deleteButton setTitle:@"刪 除" forState:UIControlStateNormal];
[_deleteButton setTitleColor:[UIColor whiteColor] forState:UIControlStateNormal];
_deleteButton.layer.cornerRadius = 4.5;? // 設(shè)置圓角
[_deleteButton addTarget:self action:@selector(deleteEvent) forControlEvents:UIControlEventTouchUpInside];
_deleteButton.userInteractionEnabled = NO;
_deleteButton.alpha = 0.4;
}
return _deleteButton;
}
@end