基本的navigationBar上面就左,中,右 3個位置，而且預設也是新增UIBarButtonItem/UINavigationBar按鈕，但是很多開發過程中會遇到在上面新增更多其它控制元件，經過研究後，所以特寫此文，算是做個筆記，也希望能夠幫助朋友解決正在解決的這方面的問題。
1.在固定位置新增UIBarButtonItem
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UIBarButtonItem *myButton = [[[UIBarButtonItem alloc]  
                initWithTitle:@"myButton" 
                style:UIBarButtonItemStyleBordered  
                target:self   
                action:@selector(action)]autorelease];  
self.navigationItem.leftBarButtonItem = myButton;  
//self.navigationItem.rightBarButtonItem = myButton;  
//self.navigationItem.backBarButtonItem = myButton;  
[myButton release]; 
 UIBarButtonItem *myButton = [[[UIBarButtonItem alloc]
     initWithTitle:@"myButton"
     style:UIBarButtonItemStyleBordered
     target:self
     action:@selector(action)]autorelease];
 self.navigationItem.leftBarButtonItem = myButton;
 //self.navigationItem.rightBarButtonItem = myButton;
 //self.navigationItem.backBarButtonItem = myButton;
 [myButton release];

  NavigationItem類有以下一些成員：

-title

-titleview

-backBarButtonItem//這是有返回上一級事件的後退按鈕

-rightBarButtonItem

-leftBarButtonItem

2.在任意位置新增一個UIToolbar疊加到navigationBar上，然後設定其背景透明，則可以實現在上這個navigationBar 上面新增多個按鈕的效果
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UIToolbar *mycustomToolBar;  
NSMutableArray *mycustomButtons = [[NSMutableArray alloc] init];  
UIBarButtonItem *myButton1 = [[[UIBarButtonItem alloc]  
                initWithTitle:@"Get5" 
                style:UIBarButtonItemStyleBordered  
                target:self   
                action:@selector(action)]autorelease];  
myButton1.width = 40;  
[mycustomButtons addObject: myButton1];  
UIBarButtonItem *myButton2 = [[[UIBarButtonItem alloc]  
                initWithTitle:@"Play5" 
                style:UIBarButtonItemStyleBordered  
                target:self   
                action:@selector(action)]autorelease];  
myButton2.width = 40;  
[mycustomButtons addObject: myButton2];   
 
mycustomToolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0f, 0.0f,320.0f, 44.0f)];  
//mycustomToolBar.center = CGPointMake(160.0f,200.0f);  
mycustomToolBar.barStyle = UIBarStyleDefault;  
[mycustomToolBar setItems:mycustomButtons animated:YES];  
[mycustomToolBar sizeToFit];      
[self.view addSubview:mycustomToolBar];  
//self.navigationItem.titleView = mycustomToolBar;//與上一句都可實現在上面疊加工具條  
//將toolbar的顏色設定為透明，總之使用兩個控制元件疊加完美  
[mycustomToolBar release];  
[mycustomButtons release]; 
 UIToolbar *mycustomToolBar;
 NSMutableArray *mycustomButtons = [[NSMutableArray alloc] init];
 UIBarButtonItem *myButton1 = [[[UIBarButtonItem alloc]
     initWithTitle:@"Get5"
     style:UIBarButtonItemStyleBordered
     target:self
     action:@selector(action)]autorelease];
 myButton1.width = 40;
 [mycustomButtons addObject: myButton1];
 UIBarButtonItem *myButton2 = [[[UIBarButtonItem alloc]
     initWithTitle:@"Play5"
     style:UIBarButtonItemStyleBordered
     target:self
     action:@selector(action)]autorelease];
 myButton2.width = 40;
 [mycustomButtons addObject: myButton2]; 
 
 mycustomToolBar = [[UIToolbar alloc] initWithFrame:CGRectMake(0.0f, 0.0f,320.0f, 44.0f)];
 //mycustomToolBar.center = CGPointMake(160.0f,200.0f);
 mycustomToolBar.barStyle = UIBarStyleDefault;
 [mycustomToolBar setItems:mycustomButtons animated:YES];
 [mycustomToolBar sizeToFit]; 
 [self.view addSubview:mycustomToolBar];
 //self.navigationItem.titleView = mycustomToolBar;//與上一句都可實現在上面疊加工具條
 //將toolbar的顏色設定為透明，總之使用兩個控制元件疊加完美
 [mycustomToolBar release];
 [mycustomButtons release];
這裡是在UIToolbar 上面新增UIBarButtonItem,然而我們很多時候可能會新增其它控制元件，如：switch,label等等，所以在UIToolbar上面如何新增各種控制元件，就參考下一篇文章。

3.在任意位置新增UISegmentedControl
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UISegmentedControl * mySegment;  
mySegment = [[UISegmentedControl alloc]  
               initWithFrame:CGRectMake(5.0f, 10.0, 60.0f, 30.0f)];  
[mySegment insertSegmentWithTitle:@"mySeg1" atIndex:0 animated:YES];   
[get5Segment insertSegmentWithTitle:@"mySeg2" atIndex:1 animated:YES];    
mySegment.segmentedControlStyle = UISegmentedControlStyleBar;  
[mySegment addTarget:self action:@selector(segAction:) forControlEvents:UIControlEventValueChanged];  
mySegment.selectedSegmentIndex = -1;  
[self.navigationController.navigationBar addSubview: mySegment];  
[mySegment release]; 
 UISegmentedControl * mySegment;
 mySegment = [[UISegmentedControl alloc]
       initWithFrame:CGRectMake(5.0f, 10.0, 60.0f, 30.0f)];
 [mySegment insertSegmentWithTitle:@"mySeg1" atIndex:0 animated:YES];
 [get5Segment insertSegmentWithTitle:@"mySeg2" atIndex:1 animated:YES]; 
 mySegment.segmentedControlStyle = UISegmentedControlStyleBar;
 [mySegment addTarget:self action:@selector(segAction:) forControlEvents:UIControlEventValueChanged];
 mySegment.selectedSegmentIndex = -1;
 [self.navigationController.navigationBar addSubview: mySegment];
 [mySegment release];
 
如果要在navigationBar實現多個按鈕，而且某個功能塊的類似按鈕需要挨在一起，用segment實現還是很不錯，用UIBarButtonItem實現的話，按鈕間總是有一個間隔。
4.在任意位置新增UILabel
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UILabel* myLabel;  
myLabel=[[UILabel alloc] initWithFrame:CGRectMake(100.0f, 14.0f, 100.0f, 10.0f)];  
myLabel.font=[UIFont systemFontOfSize:10];  
myLabel.backgroundColor = [UIColor clearColor];  
[self.navigationController.navigationBar addSubview: myLabel];  
[myLabel release]; 
 UILabel* myLabel;
 myLabel=[[UILabel alloc] initWithFrame:CGRectMake(100.0f, 14.0f, 100.0f, 10.0f)];
 myLabel.font=[UIFont systemFontOfSize:10];
 myLabel.backgroundColor = [UIColor clearColor];
 [self.navigationController.navigationBar addSubview: myLabel];
 [myLabel release];
5.在任意位置新增UIProgressView
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    UIProgressView *myProgress;  
myProgress =[[UIProgressView alloc] initWithFrame:CGRectMake(80.0f, 28.0f, 150.0f, 8.0f)];  
[self.navigationController.navigationBar addSubview: myProgress];  
[myProgress release];    
  UIProgressView *myProgress;
 myProgress =[[UIProgressView alloc] initWithFrame:CGRectMake(80.0f, 28.0f, 150.0f, 8.0f)];
 [self.navigationController.navigationBar addSubview: myProgress];
 [myProgress release]; 
 
小結：通過上面的方法 ，應該可以拋磚引玉，讓你自己新增其他任意控制元件。還等什麼呢？趕快試一下吧，讓你的navigationBar條豐富多彩吧