ios 导航栏不能使用dismissviewcontrolleranimated方法吗

2025-05-09 19:35:18
推荐回答(1个)
回答1:

本文是使用纯代码实现一个导航栏的效果。单击按钮并且产生事件。基本思路是:

1.创建一个导航栏(UINavigationBar对象)

2.创建一个导航栏集合(UINavigationItem对象)

3.创建一个左边按钮、一个右边按钮(UIBarButtonItem对象),并实现对应的事件方法

4.将导航栏集合添加到导航栏中,设置动画关闭

5.把左右两个按钮添加到导航栏集合中去

6.在视图中显示当前创建的导航栏

可以用animated

具体的实现代码如下:

ViewController.h文件中的代码不用改变,如下所示:

[cpp] view
plaincopyprint?

#import

@interface ViewController : UIViewController

@end
#import

@interface ViewController : UIViewController

@end

ViewController.m文件中的代码:

[cpp] view
plaincopyprint?

#import "ViewController.h"

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad

{

[super viewDidLoad];

// Do any additional setup after loading the view, typically from a nib.

//创建一个导航栏

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

//创建一个导航栏集合

UINavigationItem *navItem = [[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,一共有三种选择

//action:@selector:设置按钮的点击事件

//创建一个左边按钮

UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithTitle:@"左边" style:UIBarButtonItemStyleBordered target:self action:@selector(clickLeftButton)];

//创建一个右边按钮

UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"右边" style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)];

//设置导航栏的内容

[navItem setTitle:@"凌凌漆"];

//把导航栏集合添加到导航栏中,设置动画关闭

[navBar pushNavigationItem:navItem animated:NO];

//把左右两个按钮添加到导航栏集合中去

[navItem setLeftBarButtonItem:leftButton];

[navItem setRightBarButtonItem:rightButton];

//将标题栏中的内容全部添加到主视图当中

[self.view addSubview:navBar];

//最后将控件在内存中释放掉,以避免内存泄露

[navItem release];

[leftButton release];

[rightButton release];

}

-(void)showDialog:(NSString *)str

{

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

[alert show];

[alert release];

}

-(void) clickLeftButton

{

[self showDialog:@"点击了导航栏左边按钮"];

}

-(void) clickRightButton

{

[self showDialog:@"点击了导航栏右边按钮"];

}

- (void)viewDidUnload

{

[super viewDidUnload];

// Release any retained subviews of the main view.

}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation

{

return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);

}

@end