导航栏: UINavigationBar用法

来源：雨松MOMO

利用代码在屏幕中添加一个标题栏，并且在标题栏左右两方在添加两个按钮，点击后响应这两个按钮。
这里设置标题栏的显示范围。

1//创建一个导航栏

2UINavigationBar *navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];

  有了标题栏后，须要在标题栏上添加一个集合Item用来放置 标题内容，按钮等。

1//创建一个导航栏集合

2UINavigationItem *navigationItem = [[UINavigationItem alloc] initWithTitle:nil];

在这个集合Item中添加标题，按钮。
style:设置按钮的风格，一共有3中选择。
action:@selector:设置按钮点击事件。

01//创建一个左边按钮

02  UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithTitle:@"左边"

03                                                            style:UIBarButtonItemStyleBordered

04                                                            target:self

05                                                            action:@selector(clickLeftButton)]; 

06 

07  //创建一个右边按钮

08  UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"右边"

09                                                                style:UIBarButtonItemStyleDone

10                                                                target:self

11                                                                action:@selector(clickRightButton)];

12  //设置导航栏内容

13  [navigationItem setTitle:@"雨松MOMO程序世界"];

将标题栏中的内容全部添加到主视图当中。

1//把导航栏添加到视图中

2[self.view addSubview:navigationBar];

最后将控件在内存中释放掉，避免内存泄漏。

1//释放对象

2[navigationItem release];

3[leftButton release];

4[rightButton release];

如图所示：添加这两个按钮的点击响应事件。

 

 

01-(void)clickLeftButton

02{

03 

04    [self showDialog:@"点击了导航栏左边按钮"];

05 

06}

07 

08-(void)clickRightButton

09{

10 

11    [self showDialog:@"点击了导航栏右边按钮"];

12 

13}

 

 

 

 

点击后打开一个Dialog对话框，根据点击不同的按钮传入不同的显示内容。

 

1-(void)showDialog:(NSString *) str

2{

3 

4    UIAlertView * alert= [[UIAlertView alloc] initWithTitle:@"这是一个对话框" message:str delegate:self cancelButtonTitle:@"确定" otherButtonTitles: nil];   

5 

6    [alert show];

7    [alert release];

8}

最后贴上完整的代码

 

view source

01#import "TitleViewController.h"

02 

03@implementation TitleViewController

04 

05- (void)didReceiveMemoryWarning

06{

07    // Releases the view if it doesn't have a superview.

08    [super didReceiveMemoryWarning];

09 

10    // Release any cached data, images, etc that aren't in use.

11}

12 

13#pragma mark - View lifecycle

14 

15// Implement viewDidLoad to do additional setup after loading the view, typically from a nib.

16- (void)viewDidLoad

17{

18    [super viewDidLoad];

19 

20    //创建一个导航栏

21    UINavigationBar *navigationBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)]; 

22 

23    //创建一个导航栏集合

24    UINavigationItem *navigationItem = [[UINavigationItem alloc] initWithTitle:nil]; 

25 

26    //创建一个左边按钮

27    UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithTitle:@"左边"

28                                                              style:UIBarButtonItemStyleBordered

29                                                              target:self

30                                                              action:@selector(clickLeftButton)]; 

31 

32    //创建一个右边按钮

33    UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"右边"

34                                                                  style:UIBarButtonItemStyleDone

35                                                                  target:self

36                                                                  action:@selector(clickRightButton)];

37    //设置导航栏内容

38    [navigationItem setTitle:@"雨松MOMO程序世界"];

39 

40    //把导航栏集合添加入导航栏中，设置动画关闭

41    [navigationBar pushNavigationItem:navigationItem animated:NO];

42 

43    //把左右两个按钮添加入导航栏集合中

44    [navigationItem setLeftBarButtonItem:leftButton];

45    [navigationItem setRightBarButtonItem:rightButton];

46 

47    //把导航栏添加到视图中

48    [self.view addSubview:navigationBar]; 

49 

50    //释放对象

51    [navigationItem release];

52    [leftButton release];

53    [rightButton release];

54 

55}

56 

57-(void)clickLeftButton

58{

59 

60    [self showDialog:@"点击了导航栏左边按钮"];

61 

62}

63 

64-(void)clickRightButton

65{

66 

67    [self showDialog:@"点击了导航栏右边按钮"];

68 

69}

70 

71-(void)showDialog:(NSString *) str

72{

73 

74    UIAlertView * alert= [[UIAlertView alloc] initWithTitle:@"这是一个对话框" message:str delegate:self cancelButtonTitle:@"确定" otherButtonTitles: nil];   

75 

76    [alert show];

77    [alert release];

78}

79 

80- (void)viewDidUnload

81{

82    [super viewDidUnload];

83    // Release any retained subviews of the main view.

84    // e.g. self.myOutlet = nil;

85}

86 

87- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

88{

89    // Return YES for supported orientations

90    return (interfaceOrientation == UIInterfaceOrientationPortrait);

91}

92 

93@end