第4课、UITableView专题（二）

#import <UIKit/UIKit.h>

@interface ViewController : UIViewController<UITableViewDataSource, UITableViewDelegate>

@end

#import "ViewController.h"

@interface ViewController ()


//城市字典
@property (strong, nonatomic) NSDictionary * arrCities;

//省数组
@property (strong, nonatomic) NSArray * arrProvinces;



@end

@implementation ViewController

- (void)viewDidLoad
{
    [super viewDidLoad];
    
    //初始化
    NSBundle * bundle = [NSBundle mainBundle];
    self.arrCities = [NSDictionary dictionaryWithContentsOfFile:[bundle pathForResource:@"cities" ofType:@"plist"]];
    self.arrProvinces = [NSArray arrayWithContentsOfFile:[bundle pathForResource:@"provinces" ofType:@"plist"]];
}






#pragma mark - tableView DataSource

#pragma mark 分组数量
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView
{
    return self.arrProvinces.count;
}

#pragma mark 每组行数
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    NSString * provinceName = self.arrProvinces[section];
    NSArray * arrCityName =[self.arrCities objectForKey:provinceName];
    
    return arrCityName.count;
}

#pragma mark 每行内容

-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell * cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:nil];
    
    NSString * provinceName = self.arrProvinces[indexPath.section];
    NSArray * arrCityNames = [self.arrCities objectForKey:provinceName];
    
    cell.textLabel.text = arrCityNames[indexPath.row];
    
    return cell;
}

#pragma mark 头部
-(NSString *)tableView:(UITableView *)tableView titleForHeaderInSection:(NSInteger)section
{
    return self.arrProvinces[section];
}


#pragma mark 分组信息
- (NSArray *)sectionIndexTitlesForTableView:(UITableView *)tableView
{
    return self.arrProvinces;
}



#pragma mark - tableView Delegate 

#pragma mark 点击一行
-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    NSString * provinceName = self.arrProvinces[indexPath.section];
    NSArray * arrCityNames = [self.arrCities objectForKey:provinceName];
    NSLog(@"%@", arrCityNames[indexPath.row]);
}

@end

#import "NSArray+log.h"

@implementation NSArray (log)


- (NSString *)descriptionWithLocale:(id)locale
{
    NSMutableString * strDescript = [NSMutableString string];
    
    [strDescript appendString:@"("];
    [strDescript appendFormat:@"(数量总数==%i)", self.count];
    for (id obj in self)
    {
        [strDescript appendFormat:@"\n\t\"%@\",", obj];　　//格式化数组格式。
    }
    [strDescript appendString:@")"];
    return strDescript;
}

@end