自定义导航栏按钮UIBarButtonItem 文字或图片

来源：互联网发布：java工程师招聘上海编辑：程序博客网时间：2024/04/29 18:35

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。

 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

        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

- (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

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]];