如何垂直對齊UISearchBar和右鍵欄按鈕項

Question

我正在iOS應用程序上工作。它有搜索欄和右欄按鈕項目（幾個按鈕）。

的東西被初始化如下：

UISearchController *searchController = [[UISearchController alloc] initWithSearchResultsController:nil]; 
UISearchBar *searchBar = searchController.searchBar; 
[searchBar sizeToFit]; 
searchBar.placeholder = @"Search"; 

UIButton *routeButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
[routeButton setBackgroundImage:[UIImage imageNamed:@"go_route"] forState:UIControlStateNormal]; 
routeButton.frame = CGRectMake(0., 0., 30., 30.); 

UIButton *cancelButton = [UIButton buttonWithType:UIButtonTypeCustom]; 
[cancelButton setBackgroundImage:[UIImage imageNamed:@"cancel"] forState:UIControlStateNormal]; 
cancelButton.frame = CGRectMake(0., 0., 30., 30.); 

UIBarButtonItem *routeButtonItem = [[UIBarButtonItem alloc] initWithCustomView:routeButton]; 
UIBarButtonItem *cancelButtonItem = [[UIBarButtonItem alloc] initWithCustomView:cancelButton]; 

self.navigationItem.rightBarButtonItems = @[cancelButtonItem, routeButtonItem]; 
self.navigationItem.titleView = searchBar; 

功能上，它工作正常，但看起來有點怪：按鈕繪製的位上比搜索欄：

我想讓按鈕稍微低一些，與搜索欄垂直對齊。我如何實現它？

P.S. 看來，如果我改變y座標cancelButton.frame = CGRectMake(0., y, 30., 30.); - 它沒有任何效果。

Answer 1

嘗試增加你的代碼在viewDidAppear如下，

- (void)viewDidAppear:(BOOL)animated { 
    [super viewDidAppear:animated]; 

    // Enter your code 

} 

您將獲得導航項目爲中心，如果仍然沒有更新框架的嘗試，

更新在viewDidAppear其「Y」的位置，否則試試如下設置幀恰好毗鄰搜索欄，

routeButton.center = CGPointMake(routeButton.center.x, searchBar.center.y);