IOS導(dǎo)航欄的使用方法

2019-11-14 20:05:19

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來源：轉(zhuǎn)載

供稿：網(wǎng)友

本文是使用純代碼實現(xiàn)一個導(dǎo)航欄的效果。單擊按鈕并且產(chǎn)生事件?；舅悸肥牵?/p>

1.創(chuàng)建一個導(dǎo)航欄（UINavigationBar對象）

2.創(chuàng)建一個導(dǎo)航欄集合（UINavigationItem對象）

3.創(chuàng)建一個左邊按鈕、一個右邊按鈕（UIBarButtonItem對象），并實現(xiàn)對應(yīng)的事件方法

4.將導(dǎo)航欄集合添加到導(dǎo)航欄中，設(shè)置動畫關(guān)閉

5.把左右兩個按鈕添加到導(dǎo)航欄集合中去

6.在視圖中顯示當前創(chuàng)建的導(dǎo)航欄

具體的實現(xiàn)代碼如下：

ViewController.h文件中的代碼不用改變，如下所示：

[cpp] view plain copy

#import <UIKit/UIKit.h>
@interface ViewController : UIViewController
@end

ViewController.m文件中的代碼：

[cpp] view plain copy

#import "ViewController.h"
@interface ViewController ()
@end
@implementation ViewController
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
//創(chuàng)建一個導(dǎo)航欄
UINavigationBar *navBar = [[UINavigationBar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
//創(chuàng)建一個導(dǎo)航欄集合
UINavigationItem *navItem = [[UINavigationItem alloc] initWithTitle:nil];
//在這個集合Item中添加標題，按鈕
//style:設(shè)置按鈕的風格，一共有三種選擇
//action：@selector:設(shè)置按鈕的點擊事件
//創(chuàng)建一個左邊按鈕
UIBarButtonItem *leftButton = [[UIBarButtonItem alloc] initWithTitle:@"左邊" style:UIBarButtonItemStyleBordered target:self action:@selector(clickLeftButton)];
//創(chuàng)建一個右邊按鈕
UIBarButtonItem *rightButton = [[UIBarButtonItem alloc] initWithTitle:@"右邊" style:UIBarButtonItemStyleDone target:self action:@selector(clickRightButton)];
//設(shè)置導(dǎo)航欄的內(nèi)容
[navItem setTitle:@"凌凌漆"];
//把導(dǎo)航欄集合添加到導(dǎo)航欄中，設(shè)置動畫關(guān)閉
[navBar pushNavigationItem:navItem animated:NO];
//把左右兩個按鈕添加到導(dǎo)航欄集合中去
[navItem setLeftBarButtonItem:leftButton];
[navItem setRightBarButtonItem:rightButton];
//將標題欄中的內(nèi)容全部添加到主視圖當中
[self.view addSubview:navBar];
//最后將控件在內(nèi)存中釋放掉，以避免內(nèi)存泄露
[navItem release];
[leftButton release];
[rightButton release];
}
-(void)showDialog:(NSString *)str
{
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"這是一個對話框" message:str delegate:self cancelButtonTitle:@"確定" otherButtonTitles: nil];
[alert show];
[alert release];
}
-(void) clickLeftButton
{
[self showDialog:@"點擊了導(dǎo)航欄左邊按鈕"];
}
-(void) clickRightButton
{
[self showDialog:@"點擊了導(dǎo)航欄右邊按鈕"];
}
- (void)viewDidUnload
{
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end