IOS development UI-a simple car icon display program using nested models

YYcarsgroup. h file code: Copy code 1 // 2 // YYcarsgroup. h 3 // 07-car display (advanced) 4 // 5 // Created by apple on 14-5-28. 6 // Copyright (c) 2014 itcase. all rights reserved. 7 // 8 9 # import <Foundation/Foundation. h> 10 11 @ interface YYcarsgroup: NSObject12 @ property (nonatomic, copy) NSString * title; 13 @ property (nonatomic, strong) NSArray * cars; 14 15-(instancetype) initWithDict :( NSDictionary *) dict; 16 + (instancetype) carsgroupWithDict :( NSDictionary *) dict; 17 @ end copy code YYcarsgroup. m file code: Copy code 1 // 2 // YYcarsgroup. m 3 // 07-car display (advanced) 4 // 5 // Created by apple on 14-5-28. 6 // Copyright (c) 2014 itcase. all rights reserved. 7 // 8 9 # import "YYcarsgroup. h "10 # import" YYcars. h "11 12 @ implementation YYcarsgroup13-(instancetype) initWithDict :( NSDictionary *) dict14 {15 if (self = [super init]) {16 // nested dictionary to model 17 self. title = dict [@ "title"]; 18 19 // note 20 NSArray * dictcars = dict [@ "cars"]; 21 // write as follows to improve performance 22 NSMutableArray * arrayM = [NSMutableArray arrayWithCapacity: dictcars. count]; 23 for (NSDictionary * dict in dictcars) {24 YYcars * yycars = [[YYcars alloc] initWithDict: dict]; 25 [arrayM addObject: yycars]; 26} 27 // assign a value to the storage model array to attribute 28 self. cars = arrayM; 29} 30 return self; 31} 32 33 + (instancetype) carsgroupWithDict :( NSDictionary *) dict34 {35 return [[self alloc] initWithDict: dict]; 36} 37 @ end copy the code YYcars. h file copy code 1 // 2 // YYcars. h 3 // 07-car display (advanced) 4 // 5 // Created by apple on 14-5-28. 6 // Copyright (c) 2014 itcase. all rights reserved. 7 // 8 9 # import <Foundation/Foundation. h> 10 11 @ interface YYcars: NSObject12 @ property (nonatomic, copy) NSString * name; 13 @ property (nonatomic, copy) NSString * icon; 14 15-(instancetype) initWithDict :( NSDictionary *) dict; 16 + (instancetype) carsWithDict :( NSDictionary *) dict; 17 @ end copy code YYcars. m file copy code 1 // 2 // YYcars. m 3 // 07-car display (advanced) 4 // 5 // Created by apple on 14-5-28. 6 // Copyright (c) 2014 itcase. all rights reserved. 7 // 8 9 # import "YYcars. h "10 11 @ implementation YYcars12 13-(instancetype) initWithDict :( NSDictionary *) dict14 {15 if (self = [super init]) {16 self. name = dict [@ "name"]; 17 self. icon = dict [@ "icon"]; 18} 19 return self; 20} 21 + (instancetype) carsWithDict :( NSDictionary *) dict22 {23 return [[self alloc] initWithDict: dict]; 24} 25 @ end copy the code YYViewController. m file copy code 1 // 2 // YYViewController. m 3 // 07-car display (advanced) 4 // 5 // Created by apple on 14-5-28. 6 // Copyright (c) 2014 itcase. all rights reserved. 7 // 8 9 # import "YYViewController. h "10 # import" YYcarsgroup. h "11 # import" YYcars. h "12 13 @ interface YYViewController () <UITableViewDataSource> 14 @ property (strong, nonatomic) IBOutlet UITableView * tableview; 15 @ property (nonatomic, strong) NSArray * car; 16 @ end 17 18 @ implementation YYViewController 19 20-(void) viewDidLoad 21 {22 [super viewDidLoad]; 23 24 self. tableview. rowHeight = 60.f; 25 self. tableview. dataSource = self; 26 NSLog (@ "% d", self. car. count); 27} 28 # pragma mark-implement lazy loading 29 // 1. read data from the package 30 // 2. dictionary to model 31 // 3. returns cars 32-(NSArray *) car 33 {34 if (_ car = nil) {35 36 NSString * fullpath = [[NSBundle mainBundle] pathForResource: @ "cars_total.plist" ofType: nil]; 37 NSArray * arrayM = [NSArray arrayWithContentsOfFile: fullpath]; 38 39 NSMutableArray * carsarray = [NSMutableArray array]; 40 for (NSDictionary * dict in arrayM) {41 YYcarsgroup * carsgroup = [YYcarsgroup carsgroupWithDict: dict]; 42 [carsarray addObject: carsgroup]; 43} 44 _ car = [carsarray copy]; 45} 46 return _ car; 47} 48 49 50 # pragma mark-tableview data display 51 // 1. set the data source to comply with Protocol 52 // 2. return group 53 // 3. return row 54 // 4. the data corresponding to each row in each group is 55 // 4.1 to fetch the cell 56 // 4.2 in the cache. If no, the cell is created, stamp 57 // 4.3 set the cell data. 58 // 4.4 return cell 59 60-(NSInteger) numberOfSectionsInTableView :( UITableView *) tableView 61 {62 return self. car. count; 63} 64-(NSInteger) tableView :( UITableView *) tableView numberOfRowsInSection :( NSInteger) section 65 {66 YYcarsgroup * carsgroup = self. car [section]; 67 return carsgroup. cars. count; 68} 69-(UITableViewCell *) tableView :( UITableView *) tableView cellForRowAtIndexPath :( NSIndexPath *) indexPath 70 {71 static NSString * identifier = @ "car "; 72 // 4.1 fetch cell 73 UITableViewCell * cell = [tableView dequeueReusableCellWithIdentifier: identifier] in the cache; 74 // 4.2 if no cell exists, create a cell, stamp 75 if (cell = nil) {76 cell = [[UITableViewCell alloc] initWithStyle: UITableViewCellStyleDefault reuseIdentifier: identifier]; 77} 78 // 4.3 set the cell data 79 // set the corresponding group 80 YYcarsgroup * carsgroup = self. car [indexPath. section]; 81 // set the corresponding row 82 YYcars * yycars = carsgroup. cars [indexPath. row]; 83 84 cell. imageView. image = [UIImage imageNamed: yycars. icon]; 85 cell. textLabel. text = yycars. name; 86 // 4.4 return cell 87 return cell; 88} 89 90 // set the title of each group 91-(NSString *) tableView :( UITableView *) tableView titleForHeaderInSection :( NSInteger) section 92 {93 YYcarsgroup * carsgroup = self. car [section]; 94 return carsgroup. title; 95} 96 97 // set the Index 98-(NSArray *) sectionIndexTitlesForTableView :( UITableView *) tableView 99 {100 // use kvc to retrieve all titles. 101 NSArray * title = [self. car valueForKeyPath: @ "title"]; 102 return title; 103} 104 105 // hide Status Bar 106-(BOOL) prefersStatusBarHidden107 {108 return YES; 109} 110 @ end