AppDelegate 、UIApplication 的用法

转载自  http://blog.chinaunix.net/uid-26768267-id-3300042.html

1. //AppDelegate.h 头文件
2. #import <UIKit/UIKit.h>
3. @class SwitchViewController;
4. @interface AppDelegate : UIResponder <UIApplicationDelegate>
5. {
6. UIApplication *mApp; //新建一个UIApplication对象
7. }
8. @property (strong, nonatomic) UIWindow *window;
9. @property (nonatomic, retain) SwitchViewController *switchViewController; //为窗口转换的类
10. @end
11. #import "AppDelegate.h"
12. #import "SwitchViewController.h"
13. @implementation AppDelegate
14. @synthesize window = _window;
15. @synthesize switchViewController;
16. - (void)dealloc
17. {
18. [_window release];
19. [switchViewController release];
20. mApp.idleTimerDisabled = NO;
21. [super dealloc];
22. }
23. - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
24. {
25. self.window = [[[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]] autorelease];
26. //初始化
27. switchViewController = [[SwitchViewController alloc]init];
28. //这两句话效果一样
29. //[[self window]setRootViewController:switchViewController];
30. self.window.rootViewController = self.switchViewController;
31. [switchViewController release];
32. mApp = application;
33. application.idleTimerDisabled = YES;
34. [[self window]makeKeyAndVisible]; //或[self.window makeKeyAndVisible];
35. return YES;
36. }
37. @end
38. //SwitchViewController 类头文件。集中实现窗口跳转
39. #import <UIKit/UIKit.h>
40. #import "ViewTestone.h"
41. #import "ViewController.h"
42. @class ViewTestone; //View
43. @class ViewController; //View
44. typedef int RequestId;
45. enum REQUESTVIEW
46. {
47. REQUEST_TESTONEVIEW,
48. };
49. @interface SwitchViewController :UIViewController
50. {
51. }
52. @property (nonatomic, retain)ViewTestone *viewTestone;
53. @property (nonatomic, retain) UIViewController *previousViewController;
54. @property (nonatomic, retain)ViewController *viewController;
55. -(void)switchToView:(RequestId)requestId;
56. -(void)gotoTestoneView; //跳转到TestoneView
57. @end
58. //SwitchViewController.m 文件
59. #import "SwitchViewController.h"
60. @implementation SwitchViewController
61. {
62. }
63. @synthesize viewTestone;
64. @synthesize previousViewController;
65. @synthesize viewController;
66. //当程序加载完AppDelegate里的 didFinishLaunchingWithOptions 方法后就会跳到这里 .下面可把ViewController实现为默认的View加载
67. -(void)viewDidLoad
68. {
69. NSLog(@"----------");
70. if(self.viewController ==nil)
71. {
72. //新建VIEWCONTRollerr 的一个对象
73. ViewController *viewcontroll = [[ViewController alloc]initWithNibName:@"ViewConTroller" bundle:nil];
74. self.viewController = viewcontroll;
75. [viewcontroll release];
76. }
77. [self.view insertSubview:viewController.view atIndex:0];
78. self.previousViewController = self.viewController;
79. }
80. -(void)viewDidUnload
81. {
82. self.viewController = nil;
83. self.viewTestone = nil;
84. [super viewDidLoad];
85. }
86. -(void)dealloc
87. {
88. [viewTestone release];
89. [viewController release];
90. [super dealloc];
91. }
92. //下面具体实现view之间的跳转。一般的程序都会有很多个这样的窗口跳转。所以把它们集中在一个公共的类里面这样会拿的代码看上去很简洁。明了，
93. -(void)switchToView:(RequestId)requestId
94. {
95. switch (requestId) {
96. case REQUEST_TESTONEVIEW:
97. [self gotoTestoneView];
98. break;
99. //....................
100. default:
101. break;
102. }
103. }
104. //这就到了具体到某一个窗口之间的跳转了。
105. -(void)gotoTestoneView
106. {
107. NSLog(@"test ok~");
108. if(self.viewTestone ==nil)
109. {
110. ViewTestone *testOneView = [[ViewTestone alloc]initWithNibName:@"ViewTestone" bundle:nil];
111. self.viewTestone = testOneView;
112. [testOneView release];
113. }
114. if(self.previousViewController.view.superview !=nil)
115. {
116. [previousViewController.view removeFromSuperview];
117. }
118. [self.view insertSubview:viewTestone.view atIndex:0];
119. self.previousViewController = [self viewTestone];
120. }
121. @end
122. //具体的实现方法。。应用～
123. -(void)addButtonToNewView
124. {
125. //新建一个按键
126. UIButton *toviewBtn = [UIButton buttonWithType:UIButtonTypeCustom];
127. //设置按钮的背景颜色 UIControlStateNormal按钮按之前的颜色 UIControlStateHighlighted反之
128. [toviewBtn setImage:[UIImage imageNamed:@"v_exit.png"]forState:UIControlStateNormal ] ;
129. //CGRect r;
130. //r = CGRectMake(120, 300, 100, 30);
131. //设置按钮的大小
132. toviewBtn.frame = CGRectMake(120, 300, 100, 30);;
133. //为按钮添加事件
134. [toviewBtn addTarget:self action:@selector(toOntViewPress:) forControlEvents:UIControlEventTouchUpInside];
135. //加载到当前的view
136. [self.view addSubview:toviewBtn];
137. }
138. -(void)toOntViewPress:(id)sender
139. {
140. NSLog(@"successfull");
141. //前面长长的AppDelegate SwitchViewController 都是为了下面这两句话。两句话就可以轻松的跳转到你想要去的页面。这样就显得很方便。
142. AppDelegate *app = [[UIApplication sharedApplication]delegate];
143. [app.switchViewController switchToView:0];
144. }