UI 07 _ 导航视图控制器 与 属性传值

Posted 2020-09-28 brucemengbm

首先, 先创建三个VC.
完毕点击按钮, 进入下一页, 并可以返回.

要先把导航视图控制器创建出来.
在AppDelegate.m 文件里代码例如以下:

#import "AppDelegate.h"
#import "MainViewController.h"
@interface AppDelegate ()
@end

@implementation AppDelegate
- (void)dealloc{
    [_window release];
    [super dealloc];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor whiteColor];
    [self.window makeKeyAndVisible];
    [_window release];

    //先创建一个ViewController
    MainViewController *mainVC = [[MainViewController alloc] init];
   //创建导航视图控制器
    UINavigationController *navC = [[UINavigationController alloc] initWithRootViewController:mainVC];
    self.window.rootViewController = navC;
    //释放
    [mainVC release];
    [navC release];

    return YES;
}

对于导航视图控制器的一些设置.

  //导航视图控制器的高度是44,上面的状态栏高度是20,加在一起默认是64;
  // 加上一个标题.
    self.title = @"猫眼电影";
    // 对外观进行设置,不是全部的颜色都是BackgroundColor;
 self.navigationController.navigationBar.barTintColor = [UIColor redColor];

  // 创建一个UIView
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    view.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:view];
    [view release];
    // 为了防止坐标系被篡改,我们把bar从半透明改为全透明.这样坐标系的原点会自己主动向下推64
    self.navigationController.navigationBar.translucent = NO;

内容方面的设置

    //另外一种标题的设置
    self.navigationItem.title = @"骨头 商店";

    // 指定一些视图,作为titleView
    UISegmentedControl *seg = [[UISegmentedControl alloc] initWithItems:@[@"信息",@"通话"]];
    self.navigationItem.titleView = seg;
    [seg release];

创建左右两个按钮

    //左按钮
    self.navigationItem.leftBarButtonItem = [[[UIBarButtonItem alloc] initWithBarButtonSystemItem: UIBarButtonSystemItemOrganize target:self action:@selector(leftAction:)] autorelease];

    //右按钮
    //如此创建,原本拖拽的图标的颜色是黄色,但这么创建后,图标是蓝色的.
    self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"狗.png"] style:UIBarButtonItemStylePlain target:self action:@selector(rightAction:)] autorelease];

    // 以下方法图标将会显示黄色.
    // 创建一个小button,把图片装上.
    UIButton *Littlebutton = [UIButton buttonWithType:UIButtonTypeCustom];
    Littlebutton.frame = CGRectMake(0, 0, 40, 40);
    [Littlebutton setImage:[UIImage imageNamed:@"狗.png"] forState:UIControlStateNormal];
    self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:Littlebutton];

    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(260, 530, 80, 40);
    button.backgroundColor = [UIColor yellowColor];
    [self.view addSubview:button];
    [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
    button.layer.cornerRadius = 10;
    [button setTitle:@"下一页" forState:UIControlStateNormal];

对应的, 左右两个按钮的点击事件也要实现

- (void)rightAction:(UIBarButtonItem *)button{
}

- (void)leftAction:(UIBarButtonItem *)barButton{   
}

点击Button跳转到下一页.
用模态也可以跳转 , 可是跳转的页面不再有导航视图.
实现Button的点击事件
当中我要完毕从前向后传值.

- (void)click:(UIButton *)button{
-    // 用导航视图控制器跳转.
    //1.先创建下一页对象.
    SecondViewController *secondVC = [[SecondViewController alloc] init];
    //通过导航控制器找到
    [self.navigationController pushViewController:secondVC animated:YES];
    [secondVC release];

    // 属性传值第二步
    secondVC.number = 100;
    secondVC.string = self.textField.text;
    secondVC.arr = @[@"haha",@"啦啦"];   
}

第二个页面的 .h 中代码:

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController
// 属性传值第一步,在第二个页面写一条属性.
@property(nonatomic, assign)NSInteger number;

//属性传值另外一种: 针对TextField中的字符串写一条属性.
@property(nonatomic, copy)NSString *string;

//属性传值第三种: 传一个数组
@property(nonatomic, retain)NSArray *arr;

@end

第二个页面的 .m 中代码:

#import "SecondViewController.h"
#import "ThirdViewController.h"
@interface SecondViewController ()
@property(nonatomic, retain)UILabel *label;
@end

@implementation SecondViewController
- (void)dealloc{
    [_label release];
    [_string release];
    [_arr release];
    [super dealloc];
}

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
    self.view.backgroundColor = [UIColor yellowColor];
    self.navigationController.navigationBar.barTintColor = [UIColor magentaColor];

    UIButton *button = [UIButton buttonWithType:UIButtonTypeSystem];
    button.frame = CGRectMake(260, 530, 80, 40);
    button.backgroundColor = [UIColor blueColor];
    [self.view addSubview:button];
    [button addTarget:self action:@selector(click:) forControlEvents:UIControlEventTouchUpInside];
    button.layer.cornerRadius = 10;
    [button setTitle:@"下一页" forState:UIControlStateNormal];

    //第三步:
    //第一种:
    NSLog(@"%ld",self.number);

    //另外一种:
    self.label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 200, 50)];
    [self.view addSubview:self.label];
    [_label release];
    self.label.layer.borderWidth = 1;

    //属性传值第三步:里面的值赋给label
    self.label.text = self.string;
   // 第三种:
    NSLog(@"%@",self.arr[1]);  
}
- (void)click:(UIButton *)button{
    ThirdViewController *thirdVC = [[ThirdViewController alloc] init];
    [self.navigationController pushViewController:thirdVC animated:YES];
    [thirdVC release]; 
}

属性传值. 传NSIntger . NSString . NSArray