How to use the iOS navigation bar

This article is the effect of using pure code to implement a navigation bar. Click the button and generate the event. The basic ideas are:

1. Create a navigation bar (Uinavigationbar object)

2. Create a navigation bar collection (Uinavigationitem object)

3. Create a left button, a right button (Uibarbuttonitem object), and implement the corresponding event method

4. Add a navigation bar collection to the navigation bar, set the animation to close

5. Add the left and right two buttons to the navigation bar collection

6. Display the currently created navigation bar in the view

The specific implementation code is as follows:

The code in the ViewController.h file does not have to change, as follows:

[CPP]View Plaincopy < param name= "wmode" value= "Transparent" >

1. #import <UIKit/UIKit.h>
3. @interface Viewcontroller:uiviewcontroller
5. @end

Code in the VIEWCONTROLLER.M file:

[CPP]View Plaincopy

2. #import "ViewController.h"
6. @interface Viewcontroller ()
10. @end
14. @implementation Viewcontroller
18. -(void) Viewdidload
20. {
22. [Super Viewdidload];
24. additional setup after loading the view, typically from a nib.
28. //Create a navigation bar
30. Uinavigationbar *navbar = [[Uinavigationbar alloc] Initwithframe:cgrectmake (0, 0, 320, 44)];
32. //Create a navigation bar collection
34. Uinavigationitem *navitem = [[Uinavigationitem alloc] initwithtitle:nil];
36. //Add a caption to this collection item, button
38. //style: Set the style of the button, a total of three options
40. //action: @selector: Set Button's Click event
42. //Create a left button
44. Uibarbuttonitem *leftbutton = [[Uibarbuttonitem alloc] initwithtitle:@"left" style:uibarbuttonitemstylebordered  Target:self Action: @selector (Clickleftbutton)];
46. //Create a right button
48. Uibarbuttonitem *rightbutton = [[Uibarbuttonitem alloc] initwithtitle:@"right" style:uibarbuttonitemstyledone target  : Self action: @selector (Clickrightbutton)];
52. //Set the contents of the navigation bar
54. [Navitem settitle:@"lingling lacquer"];
58. //Add the navigation bar collection to the navigation bar, set the animation to close
60. [NavBar Pushnavigationitem:navitem Animated:no];
64. //Add the left and right two buttons to the navigation bar collection
66. [Navitem Setleftbarbuttonitem:leftbutton];
68. [Navitem Setrightbarbuttonitem:rightbutton];
72. //Add all the contents of the title bar to the main view
74. [Self.view Addsubview:navbar];
78. //Finally release the control in memory to avoid memory leaks
80. [Navitem release];
82. [LeftButton release];
84. [Rightbutton release];
86. }
90. -(void) ShowDialog: (NSString *) str
92. {
94. Uialertview *alert = [[Uialertview alloc] initwithtitle:@"This is a dialog box" Message:str delegate:self cancelbuttontitle:@  "OK" otherbuttontitles:nil];
96. [Alert show];
98. [Alert release];
100. }
104. -(void) Clickleftbutton
106. {
108. [Self showdialog:@ Click on theleft button of the navigation bar];
110. }
114. -(void) Clickrightbutton
116. {
118. [Self showdialog:@ Click theright button on the navigation bar];
120. }
124. -(void) Viewdidunload
126. {
128. [Super Viewdidunload];
130. //Release any retained subviews of the main view.
132. }
136. -(BOOL) Shouldautorotatetointerfaceorientation: (uiinterfaceorientation) interfaceorientation
138. {
140. return (interfaceorientation! = Uiinterfaceorientationportraitupsidedown);
142. }
146. @end

How to use the iOS navigation bar