我正在尝试在我的 UINavigationController 的工具栏中添加自定义标签。我遵循了这个 question 的最佳答案但它似乎对我不起作用,我也不知道为什么。自定义文本没有出现,但按钮在那里。当我按下它时它会突出显示,但它没有文字。
这是我的代码:
- (void) editToolbar{
NSArray *toolbarItemsCopy = [self.toolbarItems copy];
//set up the label
self.notificationsLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.0 , 11.0f, self.view.frame.size.width/0.25, 21.0f)];
self.notificationsLabel.font = [UIFont fontWithName:@"Helvetica" size:20];
self.notificationsLabel.backgroundColor = [UIColor clearColor];
//self.notificationsLabel.textColor = [UIColor colorWithRed:157.0/255.0 green:157.0/255.0 blue:157.0/255.0 alpha:1.0];
self.notificationsLabel.textColor = [UIColor blueColor];
self.notificationsLabel.text = @"Checking server";
self.notificationsLabel.textAlignment = UITextAlignmentCenter;
//init a button with custom view using the label
UIBarButtonItem *notif = [[UIBarButtonItem alloc] initWithCustomView:self.notificationsLabel];
//add to the toolbarItems
NSMutableArray *toolbarItemsMutableArray = [[NSMutableArray alloc]init];
NSLog(@"toolbar %i", self.toolbarItems.count);
//have to add the custom bar button item in a certain place in the toolbar, it should be the 3rd item
for (int i = 0; i < toolbarItemsCopy.count; i++) {
if (i == 2){
[toolbarItemsMutableArray addObject:notif];
}
NSLog(@"toolbar item %i %@", i,[toolbarItemsCopy objectAtIndex:i]);
[toolbarItemsMutableArray addObject:[toolbarItemsCopy objectAtIndex:i]];
}
if (toolbarItemsCopy.count == 4){
}else{
//remove the previous custom label
[toolbarItemsMutableArray removeObjectAtIndex:3];
}
self.toolbarItems = toolbarItemsMutableArray;
//[self.navigationController.toolbar setItems: toolbarItemsMutableArray animated:YES];
NSLog(@"toolbar %i", self.toolbarItems.count);
}https://stackoverflow.com/questions/ask
这是 NSLog 正在打印的内容:
Catalogue[361:10403] toolbar 4
Catalogue[361:10403] toolbar item 0 <UIBarButtonItem: 0x8a24650>
Catalogue[361:10403] toolbar item 1 <UIBarButtonItem: 0x8a36cd0>
Catalogue[361:10403] toolbar item 2 <UIBarButtonItem: 0x8a36d30>
Catalogue[361:10403] toolbar item 3 <UIBarButtonItem: 0x8a382f0>
Catalogue[361:10403] toolbar 5
我是这样解决的:
我必须在函数内部分配和初始化一个 UILabel,而不是使用 ivar。
UILabel *notificationsLabel = [[UILabel alloc] initWithFrame:CGRectMake(0.0 , 11.0f, self.view.frame.size.width, 21.0f)];
notificationsLabel.font = [UIFont fontWithName:@"Helvetica" size:16];
notificationsLabel.backgroundColor = [UIColor clearColor];
//self.notificationsLabel.textColor = [UIColor colorWithRed:157.0/255.0 green:157.0/255.0 blue:157.0/255.0 alpha:1.0];
notificationsLabel.textColor = [UIColor whiteColor];
notificationsLabel.text = @"Checking server";
notificationsLabel.textAlignment = UITextAlignmentCenter;
最佳答案
我相信这段代码会对你有所帮助。在记住此代码的同时更改您的代码。我已经研究过了,它运行良好,
UIToolbar *toolBar=[[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320, 44)];
[self.view addSubview:toolBar];
UILabel *titleLbl = [[UILabel alloc] initWithFrame:CGRectMake(0.0 , 11.0f, self.view.frame.size.width, 21.0f)];
[titleLbl setFont:[UIFont fontWithName:@"Helvetica-Bold" size:18]];
[titleLbl setBackgroundColor:[UIColor clearColor]];
[titleLbl setTextColor=[UIColor blueColor];
[titleLbl setText:@"Title"];
[titleLbl setTextAlignment:UITextAlignmentCenter];
UIBarButtonItem *button = [[UIBarButtonItem alloc] initWithCustomView:titleLbl];
NSArray *toolbarItemArr = [NSArray arrayWithObjects:button, nil];
[toolBar setItems:toolbarItemArr animated:YES];
为了更好地理解,您可以点击以下链接: UIToolBar Class Reference和 UIBarButtonItem Class Reference
关于iphone - 在工具栏中添加自定义标签不起作用,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9529106/