UISearchController樣式設(shè)置

以下內(nèi)容是在 Swift 4.0,iOS 11 下的運(yùn)行結(jié)果

如果傳入的searchresultscontroller為nil,則表示搜索的結(jié)果在當(dāng)前控制器中顯示,現(xiàn)在我讓它在searchresultvc中顯示

默認(rèn)樣式

初始化一個(gè) UISearchController,并將 searchBar 設(shè)置為 tableView 的 headerView 時(shí),如以下代碼:

let searchController = UISearchController.init(searchResultsController: nil)

tableView.tableHeaderView = searchController.searchBar

自定義

下面我們通過(guò)修改 searchController 的 searchBar 屬性來(lái)調(diào)整樣式。

1. searchBarStyle

搜索框樣式

public enum UISearchBarStyle : UInt {

? ? case `default` // 默認(rèn)樣式,和 UISearchBarStyleProminent 一樣

? ? case prominent // 顯示背景,常用在my Mail, Messages and Contacts

? ? case minimal // 不顯示背景,系統(tǒng)自帶的背景色無(wú)效,自定義的有效,常用在Calendar, Notes and Music

}

用例:

letsearchBar = searchController.searchBar

searchBar.searchBarStyle = .default


2. tintColor

風(fēng)格顏色,可用于修改:

輸入框的光標(biāo)顏色

取消按鈕字體顏色

選擇欄被選中時(shí)的顏色

letsearchBar = searchController.searchBar

searchBar.tintColor = .red

3. barTintColor

搜索框背景顏色

letsearchBar = searchController.searchBar

searchBar.barTintColor = .orange

4. backgroundImage

搜索框背景圖片

createImage(_:size:)?方法為創(chuàng)建一個(gè)指定顏色,指定 size 的圖片。

letsearchBar = searchController.searchBar

searchBar.backgroundImage = self.createImage(UIColor.red, size: CGSize.init(width: 200, height: 100))



5. 設(shè)置(獲?。┧阉骺虮尘皥D片

可以通過(guò)以下方式設(shè)置(獲取)搜索框背景圖片:

// 設(shè)置

// Use UIBarMetricsDefaultPrompt toseta separate backgroundImagefora search bar with a prompt

funcsetBackgroundImage(_ backgroundImage: UIImage?,forbarPosition: UIBarPosition, barMetrics: UIBarMetrics)

// 獲取

open func backgroundImage(forbarPosition: UIBarPosition, barMetrics: UIBarMetrics) -> UIImage?


public enum UIBarMetrics : Int {

? ? case `default`

? ? case compact

? ? case defaultPrompt // Applicable only in bars with the prompt property, such as UINavigationBar and UISearchBar

? ? case compactPrompt

? ? @available(iOS, introduced: 5.0, deprecated: 8.0, message: "Use UIBarMetricsCompact instead")

? ? public static var landscapePhone: UIBarMetrics { get }

? ? @available(iOS, introduced: 7.0, deprecated: 8.0, message: "Use UIBarMetricsCompactPrompt")

? ? public static var landscapePhonePrompt: UIBarMetrics { get }

}

@available(iOS 7.0, *)

public enum UIBarPosition : Int {

? ? case any

? ? case bottom // The bar is at the bottom of its local context, and directional decoration draws accordingly (e.g., shadow above the bar).

? ? case top // The bar is at the top of its local context, and directional decoration draws accordingly (e.g., shadow below the bar)

? ? case topAttached // The bar is at the top of the screen (as well as its local context), and its background extends upward—currently only enough for the status bar.

}

用例:

letsearchBar = searchController.searchBar

searchBar.setBackgroundImage(createImage(.blue, size: CGSize.init(width: 20, height: 20)),for: .any, barMetrics: .default)



6. 文本框的背景圖片

open funcsetSearchFieldBackgroundImage(_ backgroundImage: UIImage?,forstate: UIControlState)

open func searchFieldBackgroundImage(forstate: UIControlState) -> UIImage?

letsearchBar = searchController.searchBar

searchBar.setSearchFieldBackgroundImage(createImage(UIColor.yellow, size: CGSize.init(width: 200, height: 40)),for: .normal)



7. barStyle

搜索框風(fēng)格 barStyle 的類(lèi)型為 UIBarStyle,定義如下:

public enum UIBarStyle : Int {

case`default`

caseblack

}

用例:

letsearchBar = searchController.searchBar

searchBar.barStyle = .black

8. showsBookmarkButton

是否顯示搜索框右側(cè)的圖書(shū)按鈕

open var showsBookmarkButton: Bool // default is NO

9. showsCancelButton

是否顯示搜索框右側(cè)的取消按鈕。

open var showsCancelButton: Bool // default is NO

10. showsSearchResultsButton

是否顯示搜索框右側(cè)的搜索結(jié)果按鈕

open var showsSearchResultsButton: Bool // default is NO

11. isSearchResultsButtonSelected

設(shè)置搜索結(jié)果按鈕為選中狀態(tài):

open var isSearchResultsButtonSelected: Bool // default is NO

用例:

letsearchBar = searchController.searchBar

searchBar.showsSearchResultsButton =true

searchBar.isSearchResultsButtonSelected =true

12. searchFieldBackgroundPositionAdjustment

設(shè)置輸入框背景偏移量:

open var searchFieldBackgroundPositionAdjustment: UIOffset

用例:

letsearchBar = searchController.searchBar

searchBar.searchFieldBackgroundPositionAdjustment = UIOffset.init(horizontal: 16, vertical: 16)

13. searchTextPositionAdjustment

設(shè)置輸入框文本偏移量:

open var searchTextPositionAdjustment: UIOffset

用例:

letsearchBar = searchController.searchBar

searchBar.searchTextPositionAdjustment = UIOffset.init(horizontal: 16, vertical: 16)

14. 設(shè)置(獲取)搜索框的圖標(biāo)

可以設(shè)置(獲?。┑乃阉骺驁D標(biāo)包括:

搜索圖標(biāo)

清除輸入的文字的圖標(biāo)

圖書(shū)圖標(biāo)

搜索結(jié)果列表圖標(biāo)

open funcsetImage(_ iconImage: UIImage?,foricon: UISearchBarIcon, state: UIControlState)

open func image(foricon: UISearchBarIcon, state: UIControlState) -> UIImage?

letsearchBar = searchController.searchBar

searchBar.showsBookmarkButton =true

letsearchImage = self.createImage(.red, size: CGSize.init(width: 20, height: 20))

letclearImage = self.createImage(.yellow, size: CGSize.init(width: 20, height: 20))

letbookmarkImage = self.createImage(.blue, size: CGSize.init(width: 20, height: 20))

letresultsListImage = self.createImage(.orange, size: CGSize.init(width: 20, height: 20))

searchBar.setImage(searchImage,for: .search, state: .normal)

searchBar.setImage(clearImage,for: .clear, state: .normal)

searchBar.setImage(bookmarkImage,for: .bookmark, state: .normal)

searchBar.setImage(resultsListImage,for: .resultsList, state: .normal)


15. 設(shè)置(獲?。┧阉骺虻膱D標(biāo)的偏移量

除了可以設(shè)置(獲?。?14 中的圖片,還可以設(shè)置(獲取)的偏移量。

open funcsetPositionAdjustment(_ adjustment: UIOffset,foricon: UISearchBarIcon)

open func positionAdjustment(foricon: UISearchBarIcon) -> UIOffset

用例:

letsearchBar = searchController.searchBar

searchBar.setPositionAdjustment(UIOffset.init(horizontal: 10, vertical: 10),for: .search)

16. 顯示(隱藏)取消按鈕

可以用以下方法設(shè)置顯示(隱藏)取消按鈕:

open funcsetShowsCancelButton(_ showsCancelButton: Bool, animated: Bool)

當(dāng)我們希望徹底隱藏掉取消按鈕的時(shí)候,應(yīng)該怎么做呢?經(jīng)過(guò)測(cè)試發(fā)現(xiàn),只有在?UISearchController?的?delegate?中的?didPresentSearchController(_)?實(shí)現(xiàn)內(nèi)調(diào)用可以實(shí)現(xiàn)隱藏取消按鈕。

extension ViewController: UISearchControllerDelegate {

? ? func didPresentSearchController(_ searchController: UISearchController) {

searchController.searchBar.setShowsCancelButton(false, animated:false)

? ? }

}

效果如下:

可以發(fā)現(xiàn)取消按鈕先顯示了一下,然后隱藏了,效果并不理想。如果想徹底隱藏取消按鈕,有一種方法是繼承?UISearchController?和?UISearchBar?實(shí)現(xiàn)自定義。代碼如下

// 自定義 UISearchBar

class CustomSearchBar: UISearchBar {

override funclayoutSubviews() {

? ? ? ? super.layoutSubviews()

setShowsCancelButton(false, animated:false)

? ? }

}

// 自定義 UISearchController

class CustomSearchController: UISearchController {

lazy var _searchBar: CustomSearchBar = { [unowned self]in

letresult = CustomSearchBar(frame: CGRect.zero)

? ? ? ? result.delegate = self

returnresult

? ? }()


? ? override var searchBar: UISearchBar {

return_searchBar

? ? }

}

extension CustomSearchController: UISearchBarDelegate {


}

使用自定義的?CustomSearchController?可以完全隱藏取消按鈕,效果如下:

17. 設(shè)置取消按鈕的名稱(chēng)

可以通過(guò)以下幾個(gè)方法修改取消按鈕的名稱(chēng):

方法一:(已失效)

letsearchBar = searchController.searchBar

searchBar.setValue("Done",forKey:"_cancelButtonText")

方法二:

UIBarButtonItem.appearance(whenContainedInInstancesOf: [UISearchBar.self]).title ="Done"

方法三:

letsearchBar = searchController.searchBar

searchBar.showsCancelButton =true

letcancelButton = searchBar.value(forKey:"cancelButton") as? UIButton

cancelButton?.setTitle("Done",for: .normal)

注意方法三的設(shè)置順序,需要先設(shè)置 showsCancelButton 為 true,這種方式的問(wèn)題在于 cancelButton 一開(kāi)始就要被設(shè)置為顯示。

18. 搜索框附屬分欄條

在搜索框下面可以顯示搜索框附屬分欄條。 用例:

letsearchBar = searchController.searchBar

searchBar.showsScopeBar =true

// 選擇按鈕視圖的按鈕標(biāo)題

searchBar.scopeButtonTitles = ["One","Two","Three"]

// 選中的選擇按鈕下標(biāo)值,默認(rèn)值為 0,如果超出索引范圍則會(huì)被忽略

searchBar.selectedScopeButtonIndex = 1

19. 搜索框附屬分欄條——背景顏色

可以通過(guò)通過(guò)?scopeBarBackgroundImage?設(shè)置搜索框附屬分欄條的背景顏色

open var scopeBarBackgroundImage: UIImage?

用例(注意以下代碼的順序可能會(huì)產(chǎn)生不同的效果):

letsearchBar = searchController.searchBar

searchBar.showsScopeBar =true

// 選擇按鈕視圖的按鈕標(biāo)題

searchBar.scopeButtonTitles = ["One","Two","Three"]

// 選中的選擇按鈕下標(biāo)值,默認(rèn)值為 0,如果超出索引范圍則會(huì)被忽略

searchBar.selectedScopeButtonIndex = 1

searchBar.scopeBarBackgroundImage = self.createImage(UIColor.yellow, size: CGSize.init(width: 200, height: 100))

20. 搜索框附屬分欄條——按鈕的背景圖片

用以下方法可以設(shè)置(獲?。┧阉骺蚋綄俜謾跅l按鈕的背景圖片:

open funcsetScopeBarButtonBackgroundImage(_ backgroundImage: UIImage?,forstate: UIControlState)

open func scopeBarButtonBackgroundImage(forstate: UIControlState) -> UIImage?

用例:

letsearchBar = searchController.searchBar

searchBar.showsScopeBar =true

// 選擇按鈕視圖的按鈕標(biāo)題

searchBar.scopeButtonTitles = ["One","Two","Three"]

// 選中的選擇按鈕下標(biāo)值,默認(rèn)值為 0,如果超出索引范圍則會(huì)被忽略

searchBar.selectedScopeButtonIndex = 1

searchBar.scopeBarBackgroundImage = self.createImage(UIColor.yellow, size: CGSize.init(width: 200, height: 100))

searchBar.setScopeBarButtonBackgroundImage(createImage(.orange, size: CGSize.init(width: 20, height: 20)),for: .normal)

21. 搜索框附屬分欄條——按鈕的分割線(xiàn)圖片

可以用以下方法設(shè)置(獲?。┧阉骺蚋綄俜謾跅l按鈕的分割線(xiàn)圖片:

open funcsetScopeBarButtonDividerImage(_ dividerImage: UIImage?,forLeftSegmentState leftState: UIControlState, rightSegmentState rightState: UIControlState)

open func scopeBarButtonDividerImage(forLeftSegmentState leftState: UIControlState, rightSegmentState rightState: UIControlState) -> UIImage?

用例:

letsearchBar = searchController.searchBar

searchBar.showsScopeBar =true

// 選擇按鈕視圖的按鈕標(biāo)題

searchBar.scopeButtonTitles = ["One","Two","Three"]

// 選中的選擇按鈕下標(biāo)值,默認(rèn)值為 0,如果超出索引范圍則會(huì)被忽略

searchBar.selectedScopeButtonIndex = 1

searchBar.setScopeBarButtonDividerImage(createImage(.red, size: CGSize.init(width: 10, height: 20)),forLeftSegmentState: .normal, rightSegmentState: .normal)

22. 搜索框附屬分欄條——按鈕的標(biāo)題樣式

可以用以下方法設(shè)置(獲取)搜索框附屬分欄條按鈕的標(biāo)題樣式:

open funcsetScopeBarButtonTitleTextAttributes(_ attributes: [String : Any]?,forstate: UIControlState)

open func scopeBarButtonTitleTextAttributes(forstate: UIControlState) -> [String : Any]?

用例:

letsearchBar = searchController.searchBar

searchBar.showsScopeBar =true

// 選擇按鈕視圖的按鈕標(biāo)題

searchBar.scopeButtonTitles = ["One","Two","Three"]

// 選中的選擇按鈕下標(biāo)值,默認(rèn)值為 0,如果超出索引范圍則會(huì)被忽略

searchBar.selectedScopeButtonIndex = 1

searchBar.setScopeBarButtonTitleTextAttributes([NSAttributedStringKey.font.rawValue : UIFont.systemFont(ofSize: 20), NSAttributedStringKey.foregroundColor.rawValue : UIColor.red],for: .normal)

searchBar.setScopeBarButtonTitleTextAttributes([NSAttributedStringKey.font.rawValue : UIFont.systemFont(ofSize: 24), NSAttributedStringKey.foregroundColor.rawValue : UIColor.yellow],for: .selected)

23. 搜索頂部提示

在搜索框頂部可以通知 prompt 設(shè)置提示信息。

比如:

letsearchBar = searchController.searchBar

searchBar.prompt ="非活躍"

可以在 searchBar 的代理里修改 prompt 的內(nèi)容,例如:

extension ViewController: UISearchBarDelegate {

? ? func searchBarTextDidBeginEditing(_ searchBar: UISearchBar) {

searchBar.prompt ="開(kāi)始編輯"

? ? }


? ? func searchBarTextDidEndEditing(_ searchBar: UISearchBar) {

searchBar.prompt ="取消編輯"

? ? }


? ? func searchBar(_ searchBar: UISearchBar, textDidChange searchText: String) {

searchBar.prompt ="當(dāng)前輸入:\(searchText)"

? ? }


? ? func searchBarCancelButtonClicked(_ searchBar: UISearchBar) {

searchBar.prompt ="點(diǎn)擊取消"

? ? }

}

可以發(fā)現(xiàn)頂部的提示文字和輸入框重合了。所以向下調(diào)整一下輸入框的偏移量。 prompt 為空時(shí) searchBar 的高度為 56,不為空時(shí) searchBar 的高度為 75,所以我們將輸入框向下調(diào)整 19:

searchBar.searchFieldBackgroundPositionAdjustment = UIOffset.init(horizontal: 0, vertical: 19)

可以發(fā)現(xiàn)還是有問(wèn)題:

取消按鈕和輸入框不在一行上了

如果 prompt 有時(shí)有值,有時(shí)為空,searchBar 的高度無(wú)法靈活改變。

這些問(wèn)題暫時(shí)沒(méi)有找到解決方案。

其他待解決問(wèn)題

isTranslucent 沒(méi)有發(fā)現(xiàn)效果

inputAssistantItem

inputAccessoryView

搜索結(jié)果列表圖標(biāo)在什么條件下會(huì)顯示

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