自定义导航栏按钮UIBarButtonItem 文字或图片

在4.0里定义导航条按钮通常是生成普通按钮，再用它生成导航条专用按钮。

[java] view
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UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];  

[button setBackgroundImage:[UIImage imageNamed:@"button_main.png"]  

                                      forState:UIControlStateNormal];  

[button addTarget:self action:@selector(GotoSettings)  

             forControlEvents:UIControlEventTouchUpInside];  

button.frame = CGRectMake(x, y, x1, x2);  

  

UIBarButtonItem *menuButton = [[UIBarButtonItem alloc] initWithCustomView:menu];  

self.navigationItem.rightBarButtonItem = menuButton;  

  

[button release];  

[menuButton release];  

如果是在导航条一边创建多个button，在4.0里是通过segmentcontrol来间接实现

[java] view
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UISegmentedControl *SegmentedControl = [[UISegmentedControl alloc] initWithItems:  

                                         [NSArray arrayWithObjects:  

                                          @"开始",  

                                          @"暂停", nil]];  

[SegmentedControl addTarget:self action:@selector(segmentAction:)   

            forControlEvents:UIControlEventValueChanged];  

SegmentedControl.frame = CGRectMake(0, 0, 80, 30);  

SegmentedControl.segmentedControlStyle = UISegmentedControlStyleBar;  

SegmentedControl.momentary = YES;  

SegmentedControl.tintColor = [UIColor colorWithHue:0.6 saturation:0.33 brightness:0.69 alpha:0];  

//defaultTintColor = [segmentedControl.tintColor retain];    // keep track of this for later  

UIBarButtonItem *segmentBarItem = [[UIBarButtonItem alloc]   

                                       initWithCustomView:SegmentedControl];  

self.navigationItem.rightBarButtonItem = segmentBarItem;  

之后 通过Action方法判断是哪个button被按下

[java] view
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- (void)segmentAction:(id)sender  

{  

      

    //NSLog(@"segmentAction: selected segment = %d", [sender selectedSegmentIndex]);  

    if ([sender selectedSegmentIndex] == 0) {  

        //[self startAll];  

          

    }else if ([sender selectedSegmentIndex] == 1) {  

        //[self stopAll];  

    }  

      

}  

在iOS 5.0中，导航条引入了新的方法 setLeftBarButtonItems:animated:和setRightBarButtonItems:animated:来直接定义左右侧的多个button，方便了许多

[java] view
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UIBarButtonItem *startBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemPlay target:self action:@selector(startDownloadAll)];  

UIBarButtonItem *pauseBtn = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemPause target:self action:@selector(stopDownloadAll)];  

[self.navigationItem setRightBarButtonItems:[NSArray arrayWithObjects: pauseBtn,startBtn,nil]];  
转自：http://blog.csdn.net/bjash/article/details/9945405#1536434-tsina-1-71305-66a1f5d8f89e9ad52626f6f40fdeadaa