IOS学习（十四）城市级联操作（两个tabview）

#import "MainViewController.h"

@interface MainViewController ()<UITableViewDelegate, UITableViewDataSource>

@property(nonatomic, strong) UITableView *areaTabview;
@property(nonatomic, strong) UITableView *subAreaTabview;
@property(nonatomic, strong) NSArray *areaArray;
@property(nonatomic, strong) NSArray *subAreaArray;
@end

@implementation MainViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.view.backgroundColor = [UIColor whiteColor];
    self.title = @"城市级联";
    
    CGFloat with = CGRectGetWidth(self.view.bounds) / 2;
    CGFloat height = CGRectGetHeight(self.view.bounds);
    
    
    self.areaTabview = [[UITableView alloc] initWithFrame:CGRectMake(0, 0, with, height) style:UITableViewStylePlain];
    self.areaTabview.backgroundColor = [UIColor whiteColor];
    self.areaTabview.delegate = self;
    self.areaTabview.dataSource = self;
    [self.areaTabview registerClass:[UITableViewCell class] forCellReuseIdentifier:@"areaTabview"];
    [self.view addSubview:self.areaTabview];
    
    self.subAreaTabview = [[UITableView alloc] initWithFrame:CGRectMake(with, 64, with, height-64) style:UITableViewStylePlain];
    self.subAreaTabview.backgroundColor = [UIColor lightGrayColor];
    self.subAreaTabview.delegate = self;
    self.subAreaTabview.dataSource = self;
    [self.subAreaTabview registerClass:[UITableViewCell class] forCellReuseIdentifier:@"subAreaTabview"];
    [self.view addSubview:self.subAreaTabview];
    
}

-(NSArray *)areaArray{
    if (!_areaArray){

        NSString *path = [[NSBundle mainBundle] pathForResource:@"cities" ofType:@"plist"];
        _areaArray = [NSArray arrayWithContentsOfFile:path];
        
    }
    
    return _areaArray;
}


- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath{
    if (tableView == self.areaTabview){
        self.subAreaArray = [self.areaArray[indexPath.row] valueForKey:@"cities"];
        [self.subAreaTabview scrollRectToVisible:CGRectMake(0, 0, 1, 1) animated:NO];
        [self.subAreaTabview reloadData];
    }
}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
    if (tableView == self.areaTabview){
        return self.areaArray.count;
    }else{
        return self.subAreaArray.count;
    }
}

// Row display. Implementers should *always* try to reuse cells by setting each cell's reuseIdentifier and querying for available reusable cells with dequeueReusableCellWithIdentifier:
// Cell gets various attributes set automatically based on table (separators) and data source (accessory views, editing controls)

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
    UITableViewCell *cell;
    if (tableView == self.areaTabview){
        cell = [tableView dequeueReusableCellWithIdentifier:@"areaTabview"];
        cell.textLabel.text = [self.areaArray[indexPath.row] valueForKey:@"name"] ;
    }else{
        cell = [tableView dequeueReusableCellWithIdentifier:@"subAreaTabview"];
        cell.backgroundColor = [UIColor lightGrayColor];
        cell.textLabel.text = self.subAreaArray[indexPath.row];
    }
    
    return cell;
}
@end