"iOS Dev-60" case Study: TableView settings for multiple sets of data, increased right group index, multi-tier data model settings, and Valueforkeypath

Effect:

The data model here has two layers: each group of cars is a model, and each row of cars is a model.

(1) We first create a wscars model.

In the WSCars.h:

#import <Foundation/Foundation.h> @interface wscars:nsobject@property (nonatomic,copy) NSString *icon;@ Property (nonatomic,copy) NSString *name;+ (Wscars *) Carswithdict: (Nsdictionary *) dict;-(Wscars *) Initwithdict: ( Nsdictionary *) dict; @end

In the WSCARS.M:

#import "WSCars.h" @implementation wscars+ (Wscars *) Carswithdict: (nsdictionary *) dict{    return [[Self alloc] Initwithdict:dict];} -(Wscars *) Initwithdict: (nsdictionary *) dict{    if ([Super init]) {        [self setvaluesforkeyswithdictionary:dict] ;    }    return self;} @end

(2) Create a car group model again, Wscargroup.

In the WSCarGroup.h:

#import <Foundation/Foundation.h> @interface wscargroup:nsobject@property (nonatomic,copy) NSString * title;@ Property (Nonatomic,strong) Nsarray *cars;+ (Wscargroup *) Cargroupwithdict: (Nsdictionary *) dict;-(Wscargroup *) Initwithdict: (nsdictionary *) dict; @end

In wscargroup.m: (1 times a dictionary-to-model, which turns each car data into a Wscars object)

#import "WSCarGroup.h" #import "WSCars.h" @implementation wscargroup+ (Wscargroup *) Cargroupwithdict: (Nsdictionary *) dict{    return [[Self alloc]initwithdict:dict];} -(Wscargroup *) Initwithdict: (nsdictionary *) dict{    if ([Super init]) {        self.title=dict[@ "title"];                Nsarray *dictarray=dict[@ "Cars"];        Nsmutablearray *muarray=[[nsmutablearray Alloc]init];        For (Nsdictionary * dic in Dictarray) {            wscars *car=[[wscars alloc]initwithdict:dic];            [Muarray Addobject:car];        }        Self.cars=muarray;    }    return self;} @end

(3) Then in VIEWCONTROLLER.M, define the array and turn the dictionary to the model

@property (Nonatomic,strong) Nsarray *carsarray;

Dictionary to model-(Nsarray *) carsarray{    if (_carsarray==nil) {        nsstring *path=[[nsbundle mainbundle]pathforresource:@ "Cars_total.plist" Oftype:nil];        Nsarray *totalarray=[nsarray Arraywithcontentsoffile:path];        Nsmutablearray *muarray=[[nsmutablearray Alloc]init];        For (Nsdictionary *dict in Totalarray) {            wscargroup *cargroup=[[wscargroup alloc]initwithdict:dict];            [Muarray Addobject:cargroup];        }        _carsarray=muarray;    }    return _carsarray;}

The array work is done here.

(4) Drag a tableview and define the variables. This controller is treated as a data source and therefore complies with the Protocol.

@interface Viewcontroller () <UITableViewDataSource> @property (weak, nonatomic) Iboutlet UITableView *tableview;

(5) and set the data source to the current controller, by the way, set the line height

-(void) Viewdidload {    //Set data source    self.tableview.datasource=self;    Set line height    self.tableview.rowheight=60;    [Super Viewdidload];}

(6) Set the group, row, and cell data and group names of the TableView.

Set how many groups-(Nsinteger) Numberofsectionsintableview: (UITableView *) tableview{return self.carsArray.count;} Set number of lines-(Nsinteger) TableView: (UITableView *) TableView numberofrowsinsection: (nsinteger) section{Wscargroup *    Cargroup=self.carsarray[section]; return carGroup.cars.count;} Set cell contents-(UITableViewCell *) TableView: (UITableView *) TableView Cellforrowatindexpath: (Nsindexpath *) indexpath{//    Cache pool First, performance optimization static nsstring *[email protected] "car";    UITableViewCell *cell=[self.tableview Dequeuereusablecellwithidentifier:id];    if (cell==nil) {Cell=[[uitableviewcell alloc]initwithstyle:uitableviewcellstyledefault ReuseIdentifier:ID];    }//Remove data wscargroup *cargroup=self.carsarray[indexpath.section];    Wscars *cars=cargroup.cars[indexpath.row];    Assigning values to cell cell.textlabel.text=cars.name;    Cell.imageview.image=[uiimage ImageNamed:cars.icon]; return cell;} Set group name-(NSString *) TableView: (UITableView *) TableView titleforheaderinsection: (nsinteger) section{WSCArgroup *cargroup=self.carsarray[section]; return cargroup.title;}

(7) Set up Group index

-(Nsarray *) Sectionindextitlesfortableview: (UITableView *) tableview{    //need to return an array    // Valueforkey can only be found in this level dictionary, and Self.carsarray is an array, and there is no title keyword    //with Valueforkeypath to find in this and subordinate dictionary arrays, there is a path path    return [Self.carsarray valueforkeypath:@ "title"];}

(8) for easy display viewing:

Hide Status bar-(BOOL) prefersstatusbarhidden{    return YES;}

Summarize:

-The difficulty lies in the dictionary-to-model place, because the model has 2 levels.

--Added a knowledge point that displays the group index. With the Sectionindextitlesfortableview method, the return value is an array, so here we also use the Valueforkeypath method to get a string group.

iOS Development-60 case Study: TableView settings for multiple sets of data, increased right group index, multi-tier data model settings, and Valueforkeypath