[IOS](转)使用SharedApplication进行传值

 

一般而言，在iOS中页面间传值，常见的方法有四种，

    1 使用SharedApplication,定义一个变量来传递.

使用文件plist，或者NSUserdefault来传递

   3 通过一个单例的class来传递

通过Delegate来传递。

     我先学习一下第一种方法，下面为范例：

(1)AppDelegate.h

 

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1. #import <UIKit/UIKit.h>
2. 
3. @interface AppDelegate : UIResponder <UIApplicationDelegate>
4. 
5. @property (strong, nonatomic) UIWindow *window;
6. @property (strong, nonatomic) NSString *dname;//定义dname传递帐号的值
7. @property (strong, nonatomic) NSString *dpass;//定义dpass传递密码的值
8. 
9. @end

    AppDelegate.m

 

 

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1. #import "AppDelegate.h"
2. #import "ViewController.h"
3. 
4. @interface AppDelegate ()
5. 
6. @end
7. 
8. @implementation AppDelegate
9. 
10. 
11. - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
12. 
13. //create the window
14. self.window = [[UIWindow alloc]initWithFrame:[[UIScreen mainScreen] bounds]];
15. self.window.backgroundColor = [UIColor whiteColor];
16. self.window.rootViewController = [[ViewController alloc]init];
17. self.window makeKeyAndVisible];
18. return YES;
19. }
20. 
21. @end

 

(2)ViewController.h

 

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1. #import <UIKit/UIKit.h>
2. #import "AppDelegate.h"
3. 
4. @interface ViewController : UIViewController
5. 
6. 
7. @end

  ViewController.m

 

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1. #import "ViewController.h"
2. #import "NavViewController.h"
3. 
4. UITextField* nameTextField;
5. UITextField *passTextField;
6. @interface ViewController ()
7. 
8. @end
9. 
10. @implementation ViewController
11. 
12. - (void)viewDidLoad {
13. super viewDidLoad];
14. alloc]initWithFrame:CGRectMake(30, 50, 50, 30)];
15. .text = @"账号";
16. self.view addSubview:nameLabel];
17. 
18. alloc]initWithFrame:CGRectMake(30, 100, 50, 30)];
19. .text = @"密码";
20. self.view addSubview:passLabel];
21. 
22. alloc]initWithFrame:CGRectMake(100, 50, 150, 30)];
23. .borderStyle = UITextBorderStyleRoundedRect;
24. self.view addSubview:nameTextField];
25. 
26. alloc]initWithFrame:CGRectMake(100, 100, 150, 30)];
27. .borderStyle = UITextBorderStyleRoundedRect;
28. self.view addSubview:passTextField];
29. 
30. buttonWithType:UIButtonTypeSystem];
31. .frame = CGRectMake(60, 180, 72, 30);
32. setTitle:@"登陆" forState:UIControlStateNormal];
33. self.view addSubview:loginBtn];
34. addTarget:self action:@selector(onLogin:) forControlEvents:UIControlEventTouchUpInside];
35. 
36. 
37. }
38. 
39. - (void) onLogin: (id) sender
40. {
41. AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication]delegate];
42. .dname = nameTextField.text; ;
43. .dpass = passTextField.text;
44. alloc] init];
45. self presentViewController:navCtr animated:YES completion:nil];
46. }
47. 
48. @end

(3) NavViewController.h

 

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1. #import <UIKit/UIKit.h>
2. #import "AppDelegate.h"
3. 
4. @interface NavViewController : UIViewController
5. 
6. @end

  NavViewController.m

 

 

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1. #import "NavViewController.h"
2. UILabel* welcomeLabel;
3. @interface NavViewController ()
4. 
5. @end
6. 
7. @implementation NavViewController
8. 
9. - (void)viewDidLoad {
10. super viewDidLoad];
11. AppDelegate *appdelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
12. alloc]initWithFrame: CGRectMake(30, 50, 150, 30)];
13. .text = @"欢迎您，";
14. self.view addSubview:helloLabel];
15. 
16. 
17. 
18. alloc]initWithFrame: CGRectMake(30, 100, 150, 30)];
19. .text = @"您的密码是，";
20. self.view addSubview:passLabel];
21. 
22. alloc]initWithFrame:CGRectMake(85, 50, 120, 30)];
23. .text = appdelegate.dname;
24. self.view addSubview: welcomeLabel];
25. 
26. 
27. alloc]initWithFrame:CGRectMake(120, 100, 120, 30)];
28. .text = appdelegate.dpass;
29. self.view addSubview: pwdLabel];
30. 
31. }
32. 
33. 
34. 
35. @end

 

效果图如下：