我要求在我的应用程序底部的某些时间显示状态栏。我可以很容易地将它放在我的应用程序主视图的底部，但每当我在其上推动一个视图控制器时（无论是否是模态）都隐藏了这个状态栏。
有没有办法可以添加这样的状态栏，让它超出我的应用程序本身的范围？理想情况下，我希望这可以像iPhone上的呼叫状态栏一样工作 - 当此栏出现时，应用程序被按下，并且对[[UIScreen mainScreen] applicationFrame]的呼叫返回正确的大小（即它占在计算应用程序的可用高度时，是否存在此状态栏。
答案 0 :(得分：1)
我也想这样做，所以我尝试View Controller Containment。我还在尝试，所以我不愿意给予这个响当的代言，但如果你在iOS5中，那么你可能想尝试一下自己。但它似乎会给你一个状态栏，它会从屏幕底部显示或消失。
这是一个视图控制器，它将打开另一个视图控制器，但如果有要显示的状态文本，它将从屏幕底部弹出并保持在那里直到你摆脱它。到目前为止我只进行了一些测试，但它看起来像处理pushViewController / popViewController，但可能不是模态视图。
我的标题如下：
// StatusBarViewController.h
//
// Created by Robert Ryan on 7/8/12.
#import <UIKit/UIKit.h>
@interface StatusBarViewController : UIViewController
@property (strong, nonatomic) UIViewController *appController;
- (void)setStatus:(NSString *)text;
@end
我的实施文件（这是ARC）如下所示：
// StatusBarViewController.m
//
// Created by Robert Ryan on 7/8/12.
#import "StatusBarViewController.h"
@interface StatusBarViewController ()
{
BOOL _statusHidden;
UIView *_appView;
UILabel *_statusLabel;
}
@end
@implementation StatusBarViewController
@synthesize appController = _appController;
- (void)dealloc
{
_appView = nil;
_statusLabel = nil;
[self setAppController:nil]; // usually I don't like setters in dealloc, but this does some special stuff
}
- (void)createControlsWithStatusHidden
{
// create default app view that takes up whole screen
CGRect frame = self.view.frame;
frame.origin = CGPointMake(0.0, 0.0);
_appView = [[UIView alloc] initWithFrame:frame];
_appView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
_appView.clipsToBounds = YES;
[self.view addSubview:_appView];
// create status label that is just off screen below the app view
_statusLabel = [[UILabel alloc] init];
_statusLabel.font = [UIFont fontWithName:@"Helvetica-Bold" size:12.0];
_statusLabel.backgroundColor = [UIColor darkGrayColor];
_statusLabel.textColor = [UIColor whiteColor];
CGSize size = [@"Hey!" sizeWithFont:_statusLabel.font]; // test size of box with random text
_statusLabel.frame = CGRectMake(0.0, frame.size.height, frame.size.width, size.height);
_statusLabel.textAlignment = UITextAlignmentCenter;
_statusLabel.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;
[self.view addSubview:_statusLabel];
}
- (void)viewDidLoad
{
[super viewDidLoad];
[self createControlsWithStatusHidden];
_statusHidden = YES;
// I'm instantiating from storyboard. If you're using NIBs, just create your controller controller using initWithNib and then set our appController accordingly.
self.appController = [self.storyboard instantiateViewControllerWithIdentifier:@"MainNavigator"];
}
- (void)setAppController:(UIViewController *)controller
{
if (controller)
{
controller.view.frame = CGRectMake(0.0, 0.0, _appView.frame.size.width, _appView.frame.size.height);
[self addChildViewController:controller];
[controller didMoveToParentViewController:self];
if (self.appController)
{
// if we have both a new controller and and old one, then let's transition, cleaning up the old one upon completion
[self transitionFromViewController:self.appController
toViewController:controller
duration:0.5
options:UIViewAnimationOptionTransitionCrossDissolve | UIViewAnimationOptionCurveEaseInOut
animations:nil
completion:^(BOOL finished){
if (self.appController)
{
[self.appController willMoveToParentViewController:nil];
[self.appController removeFromParentViewController];
}
}];
}
else
{
// if we have no previous controller (i.e. this is our first rodeo), then just add it to the view
[_appView addSubview:controller.view];
}
}
else
{
// no new controller, so we're just removing any old on if it was there
if (self.appController)
{
// if there was an old controller, remove it's view, and remove it from the view controller hierarchy
[self.appController.view removeFromSuperview];
[self.appController willMoveToParentViewController:nil];
[self.appController removeFromParentViewController];
}
}
_appController = controller;
}
- (void)hideStatusWithCompletion:(void (^)(BOOL finished))completion
{
[UIView animateWithDuration:0.25
animations:^{
CGRect labelFrame = _statusLabel.frame;
labelFrame.origin.y += labelFrame.size.height;
_statusLabel.frame = labelFrame;
CGRect appFrame = _appView.frame;
appFrame.size.height += labelFrame.size.height;
_appView.frame = appFrame;
}
completion:completion];
}
- (void)unhideStatusWithCompletion:(void (^)(BOOL finished))completion
{
[UIView animateWithDuration:0.25
animations:^{
CGRect labelFrame = _statusLabel.frame;
labelFrame.origin.y -= labelFrame.size.height;
_statusLabel.frame = labelFrame;
CGRect appFrame = _appView.frame;
appFrame.size.height -= labelFrame.size.height;
_appView.frame = appFrame;
}
completion:completion];
}
- (void)setStatus:(NSString *)text
{
BOOL hasText = (text && [text length] > 0);
if (hasText)
{
if (!_statusHidden)
{
// if we have text, but status is already shown, then hide it and unhide it with new value
[self hideStatusWithCompletion:^(BOOL finished){
_statusLabel.text = text;
[self unhideStatusWithCompletion:nil];
}];
}
else
{
// if we have text, but no status is currently shown, then just unhide it
_statusLabel.text = text;
[self unhideStatusWithCompletion:nil];
}
_statusHidden = NO;
}
else
{
if (!_statusHidden)
{
// if we don't have text, but status bar is shown, then just hide it
[self hideStatusWithCompletion:^(BOOL finished){
_statusLabel.text = text;
}];
_statusHidden = YES;
}
}
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end
然后，任何想要更新状态消息的视图控制器都会使用类似的方法：
- (void)setStatus:(NSString *)text
{
UIViewController *controller = [UIApplication sharedApplication].delegate.window.rootViewController;
if ([controller isKindOfClass:[StatusBarViewController class]])
{
[(StatusBarViewController *)controller setStatus:text];
}
}