[英]How to add a UIToolbar to a UITableViewController programmatically?
我選擇使用沒有筆尖的UITableViewController
。 我需要一個底部帶有兩個按鈕的UIToolbar。 這樣做最簡單的方法是什么?
PS我知道我可以輕松使用UIViewController
並添加UITableView
但是我希望在應用程序中看起來一致。
有人可以幫忙嗎?
我看到了以下示例,我不確定其有效性:
(void)viewWillAppear:(BOOL)animated {
[super viewWillAppear:animated];
//Initialize the toolbar
toolbar = [[UIToolbar alloc] init]; toolbar.barStyle = UIBarStyleDefault;
//Set the toolbar to fit the width of the app.
[toolbar sizeToFit];
//Caclulate the height of the toolbar
CGFloat toolbarHeight = [toolbar frame].size.height;
//Get the bounds of the parent view
CGRect rootViewBounds = self.parentViewController.view.bounds;
//Get the height of the parent view.
CGFloat rootViewHeight = CGRectGetHeight(rootViewBounds);
//Get the width of the parent view,
CGFloat rootViewWidth = CGRectGetWidth(rootViewBounds);
//Create a rectangle for the toolbar
CGRect rectArea = CGRectMake(0, rootViewHeight - toolbarHeight, rootViewWidth, toolbarHeight);
//Reposition and resize the receiver
[toolbar setFrame:rectArea];
//Create a button
UIBarButtonItem *infoButton = [[UIBarButtonItem alloc] initWithTitle:@"back"
style:UIBarButtonItemStyleBordered
target:self
action:@selector(info_clicked:)];
[toolbar setItems:[NSArray arrayWithObjects:infoButton,nil]];
//Add the toolbar as a subview to the navigation controller.
[self.navigationController.view addSubview:toolbar];
[[self tableView] reloadData];
}
(void) info_clicked:(id)sender {
[self.navigationController popViewControllerAnimated:YES];
[toolbar removeFromSuperview];
}
更簡單的方法是在UINavigationController
之上構建項目。 它已經有一個工具欄,默認情況下它只是隱藏了。 您可以通過切換toolbarHidden
屬性來顯示它,只要它在導航控制器層次結構中,您的表視圖控制器就能夠使用它。
在您的app委托中,或者您的app委托傳遞控件的對象中,使用您的UITableViewController
作為根視圖控制器創建導航控制器:
- ( void )application: (UIApplication *)application
didFinishLaunchingWithOptions: (NSDictionary *)options
{
MyTableViewController *tableViewController;
UINavigationController *navController;
tableViewController = [[ MyTableViewController alloc ]
initWithStyle: UITableViewStylePlain ];
navController = [[ UINavigationController alloc ]
initWithRootViewController: tableViewController ];
[ tableViewController release ];
/* ensure that the toolbar is visible */
navController.toolbarHidden = NO;
self.navigationController = navController;
[ navController release ];
[ self.window addSubview: self.navigationController.view ];
[ self.window makeKeyAndVisible ];
}
然后在MyTableViewController
對象中設置工具欄項:
- ( void )viewDidLoad
{
UIBarButtonItem *buttonItem;
buttonItem = [[ UIBarButtonItem alloc ] initWithTitle: @"Back"
style: UIBarButtonItemStyleBordered
target: self
action: @selector( goBack: ) ];
self.toolbarItems = [ NSArray arrayWithObject: buttonItem ];
[ buttonItem release ];
/* ... additional setup ... */
}
您還可以在NavigationController屬性檢查器中選中“顯示工具欄”選項。
這是一個簡單的例子,可能有所幫助
UIBarButtonItem *spaceItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nil action:nil];
UIBarButtonItem *trashItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemTrash target:self action:@selector(deleteMessages)];
UIBarButtonItem *composeItem = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemCompose target:self action:@selector(composeMail)];
NSArray *toolbarItems = [NSMutableArray arrayWithObjects:spaceItem, trashItem,spaceItem,composeItem,nil];
self.navigationController.toolbarHidden = NO;
[self setToolbarItems:toolbarItems];
謝謝,開發人員
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