#在蓝懿学习iOS的日子#Day13

一、导航控制力器NavigationControeller

在第一个 ViewController前添加一个NavigationControeller，新建第二个页面 SecondViewController1、、在 ViewController.m导入

#import "SecondViewController.h"

@implementation ViewController
- (IBAction)leftAction:(UIBarButtonItem *)sender {
        NSLog(@"左按钮");
}
- (IBAction)clicked:(id)sender {
    SecondViewController *vc = [[SecondViewController alloc]init];
    [self.navigationController pushViewController:vc animated:YES];
   
}

- (void)viewDidLoad {
    [super viewDidLoad];
    //创建系统样式按钮
    UIBarButtonItem *bbi1 = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemCamera target:self action:@selector(rightAction)];
   
    //创建文字按钮
    UIBarButtonItem *bbi2 = [[UIBarButtonItem alloc]initWithTitle:@"右按钮" style:UIBarButtonItemStyleDone target:self action:@selector(rightAction)];
   
//    self.navigationItem.rightBarButtonItems = [NSArray arrayWithObjects:bbi1,bbi2, nil];
    self.navigationItem.rightBarButtonItems = @[bbi1,bbi2];
 
   
}
-(void)rightAction{
    NSLog(@"右按钮");

}

2、在   SecondViewController.m

- (void)viewDidLoad {
    [super viewDidLoad];
    self.title = @"第二个页面";
   
    [NSTimer scheduledTimerWithTimeInterval:2 target:self selector:@selector(backAction) userInfo:nil repeats:NO];
}
-(void)backAction{
    //跳回上一个页面
    [self.navigationController popViewControllerAnimated:YES];

}

二、 UITableView

@interface ViewController ()<UITableViewDataSource,UITableViewDelegate>
@property (weak, nonatomic) IBOutlet UITableView *tableView;
@property (nonatomic, strong)NSMutableArray *names;
@end

@implementation ViewController
//控制tableView有几个区
- (NSInteger)numberOfSectionsInTableView:(UITableView *)tableView{
    return 1;
}
//控制每个区有多少行
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section{
   
   
    return self.names.count;
}


//控制每行显示的内容
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{
   
 
   
    //去内存中找 有没有离开页面的cell 有得话 拿过来直接用 没有则为nil
    UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:@"cell"];
    //如果没有拿到离开页面的cell则需要创建一个
    if (!cell) {
          cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:@"cell"];
            NSLog(@"%ld-%ld",indexPath.section,indexPath.row);
    }
   
    NSString *name = self.names[indexPath.row];
   
   
    cell.textLabel.text = name;
    return cell;
}

- (void)viewDidLoad {
    [super viewDidLoad];
   
    self.names = [NSMutableArray array];
  
    [self.names addObject:@"刘德华"];
    [self.names addObject:@"张学友"];
    [self.names addObject:@"郭富城"];
   
    UIBarButtonItem *addItem = [[UIBarButtonItem alloc]initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addAction)];
    self.navigationItem.leftBarButtonItem = addItem;
}

-(void)addAction{
    NSString *name = @"王";
    [self.names addObject:name];
    //在ViewDidLoad方法之后 修改数据源数组的话 需要让tableView重新加载
    [self.tableView reloadData];
   
   
   

}