為啥會有LCFastBuildListKit的出現(xiàn)
我們在平時的開發(fā)中是否有遇到過這樣的界面需求,當(dāng)前界面元素非常多,種類多,常見的視圖處理方案便是使用UITableView或者UICollectionView去實(shí)現(xiàn),于是我們就在我們本身就臃腫的ViewController里開始寫UITableView的delegate和dataSource方法了,然后我們就可能會看到tableView:cellForRowAtIndexPath:方法里的代碼如下:
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {
NSInteger section = indexPath.section;
if (section == 0) {
if (indexPath.row == 0) {
OrderHeaderCell *cell = [tableView dequeueReusableCellWithIdentifier:@"OrderHeaderCell"];
cell.status = self.data.State;
return cell;
} else {
FBGroupPurchaseCell *cell = [tableView dequeueReusableCellWithIdentifier:@"FBGroupPurchaseCell"];
cell.list = self.productList;
return cell;
}
} else if (section == 2) {
NSArray *arr = self.resultArr[0];
if (arr.count == 0) {
VouchersWaitPayCell *cell = [tableView dequeueReusableCellWithIdentifier:@"VouchersWaitPayCell"];
return cell;
} else {
OrderInfoCell *cell = [tableView dequeueReusableCellWithIdentifier:@"OrderInfoCell"];
cell.model = arr[indexPath.row];
return cell;
}
} else if (section == 1) {
OrderInfoCell *cell = [tableView dequeueReusableCellWithIdentifier:@"OrderInfoCell"];
return cell;
} else {
OrderInfoCell *cell = [tableView dequeueReusableCellWithIdentifier:@"OrderInfoCell"];
NSArray *arr = self.resultArr[section - 2];
cell.model = arr[indexPath.row];
if (section == 3 && indexPath.row == arr.count - 1) {
[cell addline];
}
return cell;
}
}
然后tableView:heightForRowAtIndexPath:方法下可能就是
- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath {
NSInteger section = indexPath.section;
if (section == 0) {
if (indexPath.row == 0) {
return 60;
} else {
return 105;
}
} else if (section == 1) {
return 0;
} else if (section == 2){
NSArray *arr = self.resultArr[0];
if (arr.count > 0) {
return 30;
} else {
return 110;
}
} else {
return 30;
}
}
對于業(yè)務(wù)需求不大的場景來說無可厚非,一旦需要在頁面中新增一個Cell的時候,缺點(diǎn)一下就出來了,這個時候發(fā)現(xiàn)需要改的的地方好像略多了,需要去更改tableView:numberOfRowsInSectio:n、tableView:cellForRowAtIndexPath:等方法,而且原來對應(yīng)的indexPath全都不適用了。
然后呢我就思考了一下,有沒有比較好的方式來控制這種方式,讓我在以后的維護(hù)的時候,少做這樣的修改呢?
于是乎,我做過往tableView的數(shù)據(jù)源里裝identifier來區(qū)分cell,這樣我不再去考慮因?yàn)?code>Cell順序改變帶來的會很大程度影響我之前寫的代碼。但是后來發(fā)現(xiàn)還是不夠,我們還是需要在tableView:cellForRowAtIndexPath:或者tableView:heightForRowAtIndexPath:寫大量的判斷邏輯。
為了解決上面的尷尬,我就想封裝了一下UITableView和UICollectionView的代理方法,統(tǒng)一了對TableViewCell、CollectionViewCell、TableViewHeaderView等的描述:
TableViewCell:
@property (nonatomic, copy) NSString *identifier;
@property (nonatomic, assign) CGFloat cellHeight;
@property (nonatomic, strong) id data;
CollectionViewCell:
@property (nonatomic, copy) NSString *identifier;
@property (nonatomic, assign) CGSize cellSize;
@property (nonatomic, strong) id data;
TableView的組:
@property (nonatomic, copy) NSString *headerIdentifier;
@property (nonatomic, copy) NSString *footerIdentifier;
@property (nonatomic, strong) NSArray<ZLTableViewRowModel *> *items;
@property (nonatomic, strong) id headerData;
@property (nonatomic, strong) id footerData;
@property (nonatomic, assign) CGFloat headerHeight;
@property (nonatomic, assign) CGFloat footerHeight;
CollectionView的組:
@property (nonatomic, copy) NSString *headerIdentifier;
@property (nonatomic, copy) NSString *footerIdentifier;
@property (nonatomic, strong) NSArray<ZLCollectionViewRowModel *> *items;
@property (nonatomic, strong) id headerData;
@property (nonatomic, strong) id footerData;
@property (nonatomic, assign) CGSize headerSize;
@property (nonatomic, assign) CGSize footerSize;
@property (nonatomic, assign) UIEdgeInsets insets;
@property (nonatomic, assign) CGFloat minimumLineSpacing;
@property (nonatomic, assign) CGFloat minimumInteritemSpacing;
看到這里大家應(yīng)該都知道我在做什么了吧。。。。雖然不高級,但是用起來真的方便很多了。
最后的看一下使用之后的代碼是怎么樣的:
@implementation LCTableViewController
- (void)viewDidLoad {
[super viewDidLoad];
[self.manager reloadData];
}
- (NSArray<ZLTableViewSectionModel *> *)dataSource:(ZLTableViewDelegateManager *)manager {
NSMutableArray *sectionModels = [NSMutableArray array];
//組1
[sectionModels addObject:({
ZLTableViewSectionModel *sectionModel = [ZLTableViewSectionModel new];
NSMutableArray *items = [NSMutableArray array];
sectionModel.items = items;
[items addObject:({
ZLTableViewRowModel *rowModel = [ZLTableViewRowModel new];
rowModel.identifier = @"UITableViewCell1";
rowModel.cellHeight = 40;
rowModel;
})];
[items addObject:({
ZLTableViewRowModel *rowModel = [ZLTableViewRowModel new];
rowModel.identifier = @"UITableViewCell3";
rowModel.cellHeight = 100;
rowModel;
})];
[items addObject:({
ZLTableViewRowModel *rowModel = [ZLTableViewRowModel new];
rowModel.identifier = @"UITableViewCell4";
rowModel.cellHeight = 90;
rowModel;
})];
[items addObject:({
ZLTableViewRowModel *rowModel = [ZLTableViewRowModel new];
rowModel.identifier = @"UITableViewCell5";
rowModel.cellHeight = 50;
rowModel;
})];
sectionModel;
})];
//組2
[sectionModels addObject:({
ZLTableViewSectionModel *sectionModel = [ZLTableViewSectionModel new];
NSMutableArray *items = [NSMutableArray array];
sectionModel.items = items;
[items addObject:({
ZLTableViewRowModel *rowModel = [ZLTableViewRowModel new];
rowModel.identifier = @"UITableViewCell6";
rowModel.cellHeight = 60;
rowModel;
})];
[items addObject:({
ZLTableViewRowModel *rowModel = [ZLTableViewRowModel new];
rowModel.identifier = @"UITableViewCell2";
rowModel.cellHeight = 100;
rowModel;
})];
[items addObject:({
ZLTableViewRowModel *rowModel = [ZLTableViewRowModel new];
rowModel.identifier = @"UITableViewCell7";
rowModel.cellHeight = 30;
rowModel;
})];
[items addObject:({
ZLTableViewRowModel *rowModel = [ZLTableViewRowModel new];
rowModel.identifier = @"UITableViewCell4";
rowModel.cellHeight = 70;
rowModel;
})];
sectionModel;
})];
return sectionModels;
}
- (ZLTableViewDelegateManager *)manager {
if (!_manager) {
_manager = [[ZLTableViewDelegateManager alloc] init];
_manager.delegate = self;
_manager.tableView = self.tableView;
}
return _manager;
}
@end
具體使用
高度自適應(yīng)
正常情況下給ZLTableViewRowModel設(shè)置cellHeight即可,如果需要做到自適應(yīng)高度,這里需要把cellHeight設(shè)置成-1即可,(前提是cell自身已經(jīng)使用了AutoLayout撐起來了),如:
[items addObject:({
ZLTableViewRowModel *rowModel = [ZLTableViewRowModel new];
rowModel.identifier = @"UITableViewCell4";
rowModel.cellHeight = -1;
rowModel;
})];
cell需要設(shè)置代理或者更復(fù)雜的操作
設(shè)置代理這里可以給ZLTableViewRowModel賦值delegate,cell和viewController做好delegate的實(shí)現(xiàn)即可:
[items addObject:({
ZLTableViewRowModel *rowModel = [ZLTableViewRowModel new];
rowModel.identifier = @"UITableViewCell4";
rowModel.cellHeight = -1;
rowModel.delegate = self;//這里默認(rèn)是viewController來實(shí)現(xiàn)代理方法
rowModel;
})];