如何使用splitViewController何时显示barButtonItem:willChangeToDisplayMode:在iOS8上
我的应用程序的结构,很喜欢这样的:如何使用splitViewController何时显示barButtonItem:willChangeToDisplayMode:在iOS8上
UISplitViewController: the master:NavigationController1->UITableViewController
the detail:NavigationController2->UIWebViewController
我想显示barButtonItem当视图那张肖像模式在iPad上 ,我知道如何实现它在通过iOS7 willHideViewController:
-(void)splitViewController:(UISplitViewController *)svc willHideViewController:(UIViewController *)aViewController withBarButtonItem:(UIBarButtonItem *)barButtonItem forPopoverController:(UIPopoverController *)pc{ barButtonItem.title = @"Course";
self.navigationItem.leftBarButtonItem = barButtonItem;
}
-(void)splitViewController:(UISplitViewController *)svc willShowViewController:(UIViewController *)aViewController invalidatingBarButtonItem:(UIBarButtonItem *)barButtonItem{
if (barButtonItem == self.navigationItem.leftBarButtonItem) {
self.navigationItem.leftBarButtonItem = nil;
}
}
然而,该方法是在IOS 8弃用,我试图使用:
-(void)splitViewController:(UISplitViewController *)svc willChangeToDisplayMode:(UISplitViewControllerDisplayMode)displayMode{ if (displayMode == UISplitViewControllerDisplayModePrimaryHidden) {
self.navigationItem.leftBarButtonItem = svc.displayModeButtonItem;
}else{
self.navigationItem.leftBarButtonItem = nil;
}
}
此方法仅适用于显示模式更改时,但不适用于应用程序首次以纵向方向启动时。 那么如何在第一次以纵向方向加载应用程序时显示barButtonItem。
回答:
当您的视图控制器显示出来,您可以添加栏按钮:
- (void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
if (self.splitViewController.displayMode == UISplitViewControllerDisplayModePrimaryHidden)
{
UIBarButtonItem *barButtonItem = self.splitViewController.displayModeButtonItem;
barButtonItem.title = @"Show master";
self.navigationItem.leftBarButtonItem = barButtonItem;
}
}
这只会增加该按钮时,主目前处于隐藏状态。
回答:
-(void)viewWillAppear:(BOOL)animated{ [super viewWillAppear:animated];
if (self.splitViewController.displayMode == UISplitViewControllerDisplayModePrimaryHidden){
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Course" style:self.splitViewController.displayModeButtonItem.style target:self.splitViewController.displayModeButtonItem.target action:self.splitViewController.displayModeButtonItem.action];
}
}
-(void)splitViewController:(UISplitViewController *)svc willChangeToDisplayMode:(UISplitViewControllerDisplayMode)displayMode{
if (displayMode == UISplitViewControllerDisplayModePrimaryHidden) {
self.navigationItem.leftBarButtonItem = [[UIBarButtonItem alloc] initWithTitle:@"Course" style:svc.displayModeButtonItem.style target:svc.displayModeButtonItem.target action:svc.displayModeButtonItem.action];
}else{
self.navigationItem.leftBarButtonItem = nil;
}
}
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