import

Question

我首先要说的是IOS对IOS开发来说相当新！

我有一组数据，看起来像这样 -

    shopObjects *shop2 = [[shopObjects alloc] 
                initWithshopITitle:@"3 for 2 PT Sessions" 
                shopIGroup:@"standard" 
                shopIDesc:@"Special Offer - Get 3 bespoke PT sessions for the price of just one!" shopIPrice:@"00.20"  
                offer:false];

shopIgroup字段显示部分名称。

我已通过以下内容将数据列入表格视图 -

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
// NOT SURE HOW TO CALCULATE THIS!
return 3;
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{

 // NOT SURE HOW TO CALCULATE THIS!
return 0;
}

- (CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return 10; 
}


-(UITableViewCell *)tableView:(UITableView *)tableView
    cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
   static NSString *CellIdentifier =@"shopItems";
   shopObjects *s = [self.shopArray objectAtIndex:indexPath.row];
   UITableViewCell *cell = [tableView
                         dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    cell.selectionStyle = UITableViewCellSelectionStyleNone;
    cell.textLabel.text=s.shopITitle;
    cell.textLabel.backgroundColor=[UIColor clearColor];
 return cell;
}

我的问题是 -

如何计算上述方法中返回语句所需的每个部分的标题数和行数？
如何将我的单元格应用到相关部分？

更新我的ShopObjects.m文件供参考 -

@implementation shopObjects

-(id)initWithshopITitle:(NSString *)shopITitleD shopIGroup:(NSString *)shopIGroupD   shopIDesc:(NSString *)shopIDescD shopIPrice:(NSString *)shopIPriceD offer:(Boolean )offerD{
 self= [super init];
  if(self){
    self.shopITitle = shopITitleD;
    self.shopIGroup = shopIGroupD;
    self.shopIDesc = shopIDescD;
    self.shopIPrice = shopIPriceD;
    self.offer = (offerD);



  }
   return self;


 }

ShopObjects.h文件

import

@interface shopObjects : NSObject



@property(strong) NSString *shopITitle;
@property(strong) NSString *shopIGroup;
@property(strong) NSString *shopIDesc;
@property(strong) NSString *shopIPrice;
@property Boolean offer;


-(id)initWithshopITitle:(NSString *)shopITitleD shopIGroup:(NSString *)shopIGroupD shopIDesc:(NSString *)shopIDescD shopIPrice:(NSString *)shopIPriceD offer:(BOOL )offerD;


@end

阵列设置

    shopObjects *shop1 = [[shopObjects alloc] initWithshopITitle:@"1 x PT Session"     shopIGroup:@"running" shopIDesc:@"1 x 1hour fitness session with Zoe - bespoke fitness session.\n\nZoe's sessions focus on your general health and fitness so she will look at a bespoke fitness schedule that encompasses exersize, healthy eating, sleep and general lifestyle - to help you meet your goals.\n\nBe good to yourslef and give it a go.." shopIPrice:@"10.00"  offer:false];



  shopObjects *shop2 = [[shopObjects alloc] initWithshopITitle:@"3 for 2 PT Sessions" shopIGroup:@"offers" shopIDesc:@"Special Offer - Get 3 bespoke PT sessions for the price of just one!" shopIPrice:@"00.20"  offer:false];



  shopObjects *shop3 = [[shopObjects alloc] initWithshopITitle:@"1 x Running Club" shopIGroup:@"running" shopIDesc:@"1 x running club session - roup event - max group of 10." shopIPrice:@"15.00"  offer:false];


 shopObjects *shop4 = [[shopObjects alloc] initWithshopITitle:@"1 x Weights session" shopIGroup:@"weights" shopIDesc:@"1 x body building sesson" shopIPrice:@"10.90"  offer:false];



  self.shopArray = [NSArray arrayWithObjects:shop1, shop2, shop3,shop4,  nil];
  self.sectionData = [self.shopArray valueForKeyPath:@"@distinctUnionOfObjects.shopIGroup"];

更新

对于Greg - 我已经实现了你的代码和建议，应用程序仍然崩溃，我现在得到 -

NSLOG - 2013-12-05 10：16：18.595 blah [3321：70b]你好的价值= 0 2013-12-05 10：16：18.596 blah [3321：70b]你好的价值= 1 2013-12-05 10：16：18.596 blah [3321：70b]你好的价值= 2 2013-12-05 10：16：27.962 blah [3321：70b]部分：3 2013-12-05 10：16：27.962 blah [3321：70b] - [ NSCFConstantString shopIGroup]：无法识别的选择器发送到实例0x1c7c38 2013-12-05 10：16：27.965 blah [3321：70b] ***由于未捕获的异常终止应用程序＆＃39; NSInvalidArgumentException＆＃39;，原因：＆＃39; - [__ NSCFConstantString shopIGroup]：无法识别的选择器发送到实例0x1c7c38＆＃39; ***第一次抛出调用堆栈：（ 0 CoreFoundation 0x02bde5e4 __exceptionPreprocess + 180 1 libobjc.A.dylib 0x029618b6 objc_exception_throw + 44 2 CoreFoundation 0x02c7b903 - [NSObject（NSObject）doesNotRecognizeSelector：] + 275 3 CoreFoundation 0x02bce90b ___转发_ + 1019 4 CoreFoundation 0x02bce4ee _CF_forwarding_prep_0 + 14 5 blah 0x000198fb - [shopTVcontroller tableView：numberOfRowsInSection：] + 187 6 UIKit 0x00a33dc0 - [UISectionRowData refreshWithSection：tableView：tableViewRowData：] + 2510 7 UIKit 0x00a39384 - [UITableViewRowData rectForFooterInSection：heightCanBeGuessed：] + 288 8 UIKit 0x00a39495 - [UITableViewRowData heightForTable] + 68 9 UIKit 0x008ae181 - [UITableView _updateContentSize] + 400 10 UIKit 0x008c9333 - [UITableView setContentInset：] + 329 11 UIKit 0x008efeba - [UIViewController _setNavigationControllerContentInsetAdjustment：] + 538 12 UIKit 0x0091a9bc - [UINavigationController _computeAndApplyScrollContentInsetDeltaForViewController：] + 399 13 UIKit 0x0091ab2e - [UINavigationController _layoutViewController：] + 64 14 UIKit 0x0091b02b - [UINavigationController _updateScrollViewFromViewController：toViewController：] + 235 15 UIKit 0x0090f8ff - [UINavigationController _startCustomTransition：] + 2087 16 UIKit 0x0091c0c7 - [UINavigationController _startDeferredTransitionIfNeeded：] + 688 17 UIKit 0x0091ccb9 - [UINavigationController viewWillLayoutSubviews] + 57 18 UIKit 0x00a56181 - [UILayoutContainerView layoutSubviews] + 213 19 UIKit 0x0084c267 - [UIView（CALayerDelegate）layoutSublayersOfLayer：] + 355 20 libobjc.A.dylib 0x0297381f - [NSObject performSelector：withObject：] + 70 21 QuartzCore 0x0221a2ea - [CALayer layoutSublayers] + 148 22 QuartzCore 0x0220e0d4 _ZN2CA5Layer16layout_if_neededEPNS_11TransactionE + 380 23 QuartzCore 0x0220df40 _ZN2CA5Layer28layout_and_display_if_neededEPNS_11TransactionE + 26 24 QuartzCore 0x02175ae6 _ZN2CA7Context18commit_transactionEPNS_11TransactionE + 294 25 QuartzCore 0x02176e71 _ZN2CA11Transaction6commitEv + 393 26 QuartzCore 0x02177544 _ZN2CA11Transaction17observer_callbackEP19__CFRunLoopObservermPv + 92 27 CoreFoundation 0x02ba64ce __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION + 30 28 CoreFoundation 0x02ba641f __CFRunLoopDoObservers + 399 29 CoreFoundation 0x02b84344 __CFRunLoopRun + 1076 30 CoreFoundation 0x02b83ac3 CFRunLoopRunSpecific + 467 31 CoreFoundation 0x02b838db CFRunLoopRunInMode + 123 32 GraphicsServices 0x03c349e2 GSEventRunModal + 192 33 GraphicsServices 0x03c34809 GSEventRun + 104 34 UIKit 0x007e1d3b UIApplicationMain + 1225

36  libdyld.dylib                       0x0314f70d start + 1
)
libc++abi.dylib: terminating with uncaught exception of type NSException
(lldb)

错误屏幕 - enter image description here

Answer 1

您可以从数组中获取对象的不同部分。最好的方法是添加NSArray类型的新@property（稍后需要它），例如sectionData，并在viewDidLoad中加载不同的值：

self.sectionData = [self.shopArray valueForKeyPath:@"@distinctUnionOfObjects.shopIGroup"];

接下来，你可以只显示一些不同的对象，它可以为你提供多个部分

- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return [self.sectionData count];
}

要获得每个部分的行数，您必须过滤数组中的部分名称，如下所示：

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    //Get your section name from distinct array
    NSString *s = self.sectionData[section]
    //Filter your main array
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"shopIGroup like %@", s];
    NSArray *filteredArr = [self.shopArray filteredArrayUsingPredicate:pred];
    return [filteredArr count];
}

要显示数据，您必须在cellForRowAtIndexPathMethod中执行与上述类似的操作：

-(UITableViewCell *)tableView:(UITableView *)tableView
    cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
   static NSString *CellIdentifier =@"shopItems";
   UITableViewCell *cell = [tableView
                         dequeueReusableCellWithIdentifier:CellIdentifier forIndexPath:indexPath];
    cell.selectionStyle = UITableViewCellSelectionStyleNone;

    //Get your section name from distinct array
    NSString *s = self.sectionData[indexPath.section]
    //Filter your main array
    NSPredicate *pred = [NSPredicate predicateWithFormat:@"shopIGroup like %@", s];
    NSArray *filteredArr = [self.shopArray filteredArrayUsingPredicate:pred];
   shopObjects *rightS = filteredArr[indexPath.row]
    cell.textLabel.text=rightS.shopITitle;
    cell.textLabel.backgroundColor=[UIColor clearColor];
 return cell;
}

我建议你改变数据结构。在这种项目中，我使用array（mainArray）和另一个嵌入的数组（sectionArray），我保留了对象。所以我知道，例如我的第一个数组包含第一个部分的另一个对象数组。我可以这样的部分：

[mainArray count]

每个部分的行如下：

 mainArray[section].count

每行的数据：

mainArray[section][row]

希望你觉得它很有用。

Answer 2

您可以使用TLIndexPathDataModel中的TLIndexPathTools而不是数组。它可以将您的数据组织成各个部分，并提供一系列方便的API来实现您的数据源并委派[dataModel numberOfRowsInSection:]和[dataModel itemForRowAtIndexPath:]等方法。

在您的情况下，您可以像这样创建数据模型：

NAArray *items = ...;// array of shopObjects
TLIndexPathDataModel *dataModel = [[TLIndexPathDataModel alloc] initWithItems:items sectionNameKeyPath:@"shopIGroup" identifierKeyPath:nil];

UiTableView - 将内容添加到相关部分

import

2 个答案: