UI 07 _ 導航視圖控制器 與 屬性傳值

首先, 先創建三個VC.
完成點擊按鈕, 進入下一頁, 並能夠返回.

要先把導航視圖控制器創建出來.
在AppDelegate.m 文件中代碼如下:

#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];

    //先創建一個ViewController
    MainViewController *mainVC = [[MainViewController alloc] init];
   //創建導航視圖控制器
    UINavigationController *navC = [[UINavigationController alloc] initWithRootViewController:mainVC];
    self.window.rootViewController = navC;
    //釋放
    [mainVC release];
    [navC release];

    return YES;
}

對於導航視圖控制器的一些設置.

  //導航視圖控制器的高度是44,上面的狀態欄高度是20,加在一起默認是64;
  // 加上一個標題.
    self.title = @"貓眼電影";
    // 對外觀進行設置,不是所有的顏色都是BackgroundColor;
 self.navigationController.navigationBar.barTintColor = [UIColor redColor];

  // 創建一個UIView
    UIView *view = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 100, 100)];
    view.backgroundColor = [UIColor orangeColor];
    [self.view addSubview:view];
    [view release];
    // 爲了防止座標系被篡改,我們把bar從半透明改爲全透明.這樣座標系的原點會自動向下推64
    self.navigationController.navigationBar.translucent = NO;

內容方面的設置

    //第二種標題的設置
    self.navigationItem.title = @"骨頭 商店";

    // 指定一些視圖,作爲titleView
    UISegmentedControl *seg = [[UISegmentedControl alloc] initWithItems:@[@"信息",@"通話"]];
    self.navigationItem.titleView = seg;
    [seg release];

創建左右兩個按鈕

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

    //右按鈕
    //如此創建,原本拖拽的圖標的顏色是黃色,但這麼創建後,圖標是藍色的.
    self.navigationItem.rightBarButtonItem = [[[UIBarButtonItem alloc] initWithImage:[UIImage imageNamed:@"狗.png"] style:UIBarButtonItemStylePlain target:self action:@selector(rightAction:)] autorelease];

    // 下面方法圖標將會顯示黃色.
    // 創建一個小button,把圖片裝上.
    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:@"下一頁" forState:UIControlStateNormal];

相應的, 左右兩個按鈕的點擊事件也要實現

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

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

點擊Button跳轉到下一頁.
用模態也可以跳轉 , 但是跳轉的頁面不再有導航視圖.
實現Button的點擊事件
其中我要完成從前向後傳值.

- (void)click:(UIButton *)button{
-    // 用導航視圖控制器跳轉.
    //1.先創建下一頁對象.
    SecondViewController *secondVC = [[SecondViewController alloc] init];
    //通過導航控制器找到
    [self.navigationController pushViewController:secondVC animated:YES];
    [secondVC release];

    // 屬性傳值第二步
    secondVC.number = 100;
    secondVC.string = self.textField.text;
    secondVC.arr = @[@"haha",@"啦啦"];   
}

第二個頁面的 .h 中代碼:

#import <UIKit/UIKit.h>

@interface SecondViewController : UIViewController
// 屬性傳值第一步,在第二個頁面寫一條屬性.
@property(nonatomic, assign)NSInteger number;

//屬性傳值第二種: 針對TextField中的字符串寫一條屬性.
@property(nonatomic, copy)NSString *string;

//屬性傳值第三種: 傳一個數組
@property(nonatomic, retain)NSArray *arr;

@end

第二個頁面的 .m 中代碼:

#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:@"下一頁" forState:UIControlStateNormal];

    //第三步:
    //第一種:
    NSLog(@"%ld",self.number);

    //第二種:
    self.label = [[UILabel alloc] initWithFrame:CGRectMake(100, 100, 200, 50)];
    [self.view addSubview:self.label];
    [_label release];
    self.label.layer.borderWidth = 1;

    //屬性傳值第三步:裏面的值賦給label
    self.label.text = self.string;
   // 第三種:
    NSLog(@"%@",self.arr[1]);  
}
- (void)click:(UIButton *)button{
    ThirdViewController *thirdVC = [[ThirdViewController alloc] init];
    [self.navigationController pushViewController:thirdVC animated:YES];
    [thirdVC release]; 
}

屬性傳值. 傳NSIntger . NSString . NSArray