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我需要这样的东西 http://anishusite.appspot.com/hbimgs/Bills220.png

能够从导航栏中更改日期...这是如何完成的？我尝试添加一个带有数千个按钮的工具栏和一个带有日期标签的视图，但效果不佳

http://osmorphis.blogspot.ro/2009/05/multiple-buttons-on-navigation-bar.html

这是代码：

  //first create the view 
UIView *titleView = [[UIView alloc] initWithFrame:CGRectMake(0, 6, 157, 33)];
[titleView setBackgroundColor:[UIColor clearColor]];

//add the buttons to the view
UIButton *prevButton = [UIButton buttonWithType:UIButtonTypeCustom];
[prevButton setFrame:CGRectMake(0, 1, 32, 32)];
[prevButton setBackgroundImage:[UIImage imageNamed:@"36-circle-west"] forState:UIControlStateNormal];
[prevButton addTarget:self action:@selector(prevMonth) forControlEvents:UIControlEventTouchUpInside];
[titleView addSubview:prevButton];


UIButton *nextButton = [UIButton buttonWithType:UIButtonTypeCustom];
[nextButton setFrame:CGRectMake(145, 1, 32, 32)];
[nextButton setBackgroundImage:[UIImage imageNamed:@"20-circle-east"] forState:UIControlStateNormal];
[nextButton addTarget:self action:@selector(nextMonth) forControlEvents:UIControlEventTouchUpInside];
[titleView addSubview:nextButton];

[self.dateLabel setFrame:CGRectMake(33, 1, 90, 33)];
[self.dateLabel setBackgroundColor:[UIColor clearColor]];
[self.dateLabel setTextAlignment:UITextAlignmentCenter];

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
[dateFormatter setDateStyle:NSDateFormatterNoStyle];
[dateFormatter setTimeStyle:NSDateFormatterNoStyle];
[dateFormatter setDateFormat:@"MMMM,YYYY"];
NSString *dateString = [dateFormatter stringFromDate:self.beginDate];
NSLog(@"the title date string: %@",dateString);

[self.dateLabel setText:dateString];
[self.dateLabel setTextColor:[UIColor whiteColor]];
[self.dateLabel setBackgroundColor:[UIColor clearColor]];
[self.dateLabel setFont:[UIFont fontWithName:@"System" size:17.0]];

//create the toolbar itself

UIToolbar *toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 240, 44)];
[toolbar setBackgroundColor:[UIColor clearColor]];

NSMutableArray *items  = [NSMutableArray arrayWithCapacity:3];

UIBarButtonItem *addButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAdd target:self action:@selector(addTransaction)];
addButton.style = UIBarButtonItemStyleBordered;


UIBarButtonItem *spacer = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];

UIBarButtonItem *theView = [[UIBarButtonItem alloc] initWithCustomView:titleView];

[items addObject:theView];
[items addObject:spacer];
[items addObject:addButton];

[toolbar setItems:items animated:NO];

self.navigationItem.rightBarButtonItem = [[UIBarButtonItem alloc] initWithCustomView:toolbar];

http://www.shareimages.com/image.php?61601-qpyWmpSfk5.kmpyWmak-screen.png

如您所见，它看起来并不好。标签未显示...这些按钮似乎只有在上半部分点击时才起作用。（当被点击时，这些方法被称为 ok ）......有什么想法吗？顺便说一句，导航栏有一个背景图片，但是工具栏把它盖住了..为什么？我用清晰的彩色背景制作了工具栏....

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1 回答 1

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UINavigationItem 有一个 titleView 属性。您可以将其设置为您创建的任何视图。因此，创建一个具有透明背景的 UIToolbar 子类，向其中添加按钮和文本标签，然后：

self.navigationItem.titleView = myCustomView;

其中 myCustomView 是包含箭头按钮和标签的视图。此视图可能是 UIToolbar 子类，请阅读不能 UIToolBar 是透明的吗？有关创建透明 UIToolbar 子类的技巧，然后添加您的按钮：

flex spacer，左箭头，带有堆叠 UILabel 的自定义视图，右箭头，flex spacer

于 2012-08-22T15:05:22.320 回答