[英]UIBarButton Title Only Shows Periodically
我以编程方式将UIToolbar添加到我的UIViewController中。
我的问题是,创建视图时,工具栏“ DO”中的按钮会显示,但它们不会显示标题文本。
如果我等待10-20秒甚至更长的时间,标题将最终显示出来。
我尝试调用setNeedsDisplay和setNeedsLayout来强制UI yo更新,但是它无法正常工作。
我在做一些荒谬的事情吗? 我一辈子都无法弄清楚为什么标题没有立即显示。
-(id)initWithFrame:(CGRect)frame
{
self= [super init];
if (self) {
UIView *view=[[UIView alloc]initWithFrame:frame];
self.view=view;
cellLoader = [UINib nibWithNibName:CellClassName bundle:[NSBundle mainBundle]] ;
self.tableView=[[UITableView alloc]initWithFrame:CGRectMake(self.view.frame.origin.x,
self.view.frame.origin.y+44,
self.view.frame.size.width,
self.view.frame.size.height-44)
style:UITableViewStylePlain];
[self.tableView registerClass:[MyCell class] forCellReuseIdentifier:@"mycell"];
[self.view addSubview:self.tableView];
self.tableView.dataSource=self;
self.tableView.delegate=self;
//[self.tableView setContentInset:UIEdgeInsetsMake(44, 0, 0, 0)];
navItem = [[UINavigationItem alloc] init];
UILabel* lbNavTitle = [[UILabel alloc] initWithFrame:CGRectMake(-200,50,100,40)];
[lbNavTitle setBackgroundColor:[UIColor clearColor]];
lbNavTitle.textAlignment = NSTextAlignmentLeft;
[lbNavTitle setTextColor:[UIColor whiteColor]];
lbNavTitle.text = NSLocalizedString(@"",@"");
navItem.titleView = lbNavTitle;
naviBar = [[UINavigationBar alloc] init];
naviBar.barStyle=UIBarStyleBlack;
naviBar.items = [NSArray arrayWithObject:navItem];
naviBar.frame = CGRectMake(0.0, 0, self.view.frame.size.width, 44.0);
toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 350, 44)];
toolbar.barStyle=UIBarStyleBlack;
NSMutableArray *buttons = [[NSMutableArray alloc] initWithCapacity:7];
button1=[[UIBarButtonItem alloc]
initWithTitle:@"Button 1 text"
style:UIBarButtonItemStyleBordered target:self
action:@selector(buttononepressed:)];
[buttons addObject: button1];
UIBarButtonItem *spacer1 = [[UIBarButtonItem alloc]
initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace
target:nil
action:nil];
[buttons addObject:spacer1];
button2=[[UIBarButtonItem alloc]
initWithTitle:@"Button 2 text"
style:UIBarButtonItemStyleBordered target:self
action:@selector(button2pressed:)];
[buttons addObject:button2];
[toolbar setItems:buttons animated:NO];
[self.view addSubview:toolBar];
[naviBar setNeedsDisplay];
[toolbar setNeedsDisplay];
[self.view setNeedsDisplay];
}
return self;
}
好的,如果这是您的viewController,则您不想在init方法中创建所有视图层次结构,而是使用viewDidLoad
方法。 (而且您不必自己设置self.view
, UIViewController
中的默认实现为您完成了此操作)
另外,您正在创建UINavigationBar
和UIToolBar
,当您仅将工具栏添加为子视图时,将两者设置为相同的框架...(我也会考虑此UINavigationBar
垃圾代码)
- (void)viewDidLoad
{
cellLoader = [UINib nibWithNibName:CellClassName bundle:[NSBundle mainBundle]] ;
self.tableView=[[UITableView alloc]initWithFrame:CGRectMake(self.view.frame.origin.x,
self.view.frame.origin.y+44,
self.view.frame.size.width,
self.view.frame.size.height-44)
style:UITableViewStylePlain];
[self.tableView registerClass:[MyCell class] forCellReuseIdentifier:@"mycell"];
[self.view addSubview:self.tableView];
self.tableView.dataSource=self;
self.tableView.delegate=self;
toolbar = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 350, 44)];
toolbar.barStyle=UIBarStyleBlack;
UIBarButtonItem *button1 = [[UIBarButtonItem alloc] initWithTitle:@"Button 1 text"
style:UIBarButtonItemStyleBordered target:self
action:@selector(buttononepressed:)];
UIBarButtonItem *spacer1 = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFixedSpace
target:nil
action:nil];
UIBarButtonItem *button2 = [[UIBarButtonItem alloc] initWithTitle:@"Button 2 text"
style:UIBarButtonItemStyleBordered target:self
action:@selector(button2pressed:)];
// using Objective-C litterals you shorter code than using NSMutableArray !
[toolbar setItems:@[button1, spacer1, button2] animated:NO];
[self.view addSubview:toolBar];
}
}
通常,这就是您所需要的(不调用setNeedsDisplay
,添加子视图时这些会自动完成)
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