Question

我正在开发一个小应用程序。我需要在子类中创建三个按钮。一个按钮是add，另一个是search，最后一个是back。我还创建左右按钮。但我无法在导航栏的中心创建搜索按钮。我该如何创建它？我的代码是：

- (void)viewDidLoad 
{
[super viewDidLoad];
UIBarButtonItem *flipButton = [[UIBarButtonItem alloc] initWithTitle:@"Flip"                                            
                                   style:UIBarButtonItemStyleBordered 
                               target:self 
                               action:@selector(flipView)];
self.navigationItem.rightBarButtonItem = flipButton;
[flipButton release];

UIBarButtonItem *flipButtons = [[UIBarButtonItem alloc] 
                               initWithTitle:@"Add"                 
                               style:UIBarButtonItemStyleBordered 
                               target:self 
                               action:@selector(addbuttonview)];
self.navigationItem.leftBarButtonItem = flipButtons;
[flipButtons release];

}

如何在导航栏中创建中间按钮？请帮帮我。

Answer 1

以下是以编程方式在导航栏中使用段控件的代码

NSArray* arr = [[NSArray alloc] initWithObjects:[UIImage imageNamed:@"Log_Button.png"], [UIImage   imageNamed:@"Chart_Button.png"], nil];
segmentedControl = [[UISegmentedControl alloc] initWithItems:arr];
[segmentedControl addTarget:self action:@selector(action)   forControlEvents:UIControlEventValueChanged];
[segmentedControl setSegmentedControlStyle:UISegmentedControlStyleBar];
[arr release];
UIBarButtonItem *rb = [[UIBarButtonItem alloc] initWithCustomView:segmentedControl];
[self.navigationItem setRightBarButtonItem:rb];
[rb release];

Answer 2

UIButton *btnBack = [UIButton buttonWithType:UIButtonTypeCustom];
        btnBack.frame = CGRectMake(10, 4, 100, 50);
        [btnBack setImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"button_back" ofType:@"png"]] forState:UIControlStateNormal];    
        [btnBack addTarget:self action:@selector(btnBackPressed:) forControlEvents:UIControlEventTouchUpInside];
        [self.navigationController.navigationBar addSubview:btnBack];

UIButton *btnHome = [UIButton buttonWithType:UIButtonTypeCustom];
        btnHome.frame = CGRectMake(115, 4, 38, 30);
        [btnHome setImage:[UIImage imageWithContentsOfFile:[[NSBundle mainBundle] pathForResource:@"header_icon_home" ofType:@"png"]] forState:UIControlStateNormal];
        [btnHome addTarget:self action:@selector(btnHomePressed:) forControlEvents:UIControlEventTouchUpInside];
        [self.navigationController.navigationBar addSubview:btnHome];



UIButton *searchBtn=[UIButton buttonWithType:UIButtonTypeCustom];
        searchBtn.frame=CGRectMake(175, 2, 60, 40);
        [searchBtn addTarget:self action:@selector(seachbtnPressed:) forControlEvents:UIControlEventTouchDown];
        [searchBtn setImage:[UIImage imageNamed:@"Search.jpg"] forState:0];
        [self.navigationController.navigationBar addSubview:searchBtn];

取三个UIButtons并添加到navigationBar.set帧图像为Per Ur Design。

如何以编程方式在iPhone中的UINavigationbar中创建三个按钮？

2 个答案: