使用swift IOS使一个uibarbuttonite消失
我有一个从故事板链接到的IBOutlet使用swift IOS使一个uibarbuttonite消失,swift,conditional-statements,uibarbuttonitem,iboutlet,Swift,Conditional Statements,Uibarbuttonitem,Iboutlet,我有一个从故事板链接到的IBOutlet @IBOutlet var creeLigueBouton: UIBarButtonItem! 如果条件成立,我想让它消失 if(condition == true) { // Make it disappear } 是否确实要隐藏/显示克里利格布顿?相反,启用/禁用UIBarButtonims要容易得多。您可以使用几行代码来完成此操作: if(condition == true) { creeLigueBouton.enabled
@IBOutlet var creeLigueBouton: UIBarButtonItem!
如果条件成立,我想让它消失
if(condition == true)
{
// Make it disappear
}
是否确实要隐藏/显示克里利格布顿?相反,启用/禁用UIBarButtonims要容易得多。您可以使用几行代码来完成此操作:
if(condition == true) {
creeLigueBouton.enabled = false
} else {
creeLigueBouton.enabled = true
}
此代码甚至可以用更短的方式重写:
creeLigueBouton.enabled = !creeLigueBouton.enabled
让我们在UIViewController子类中查看它:
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var creeLigueBouton: UIBarButtonItem!
@IBAction func hide(sender: AnyObject) {
creeLigueBouton.enabled = !creeLigueBouton.enabled
}
}
如果确实要显示/隐藏
creeLigueBouton
,可以使用以下代码:
import UIKit
class ViewController: UIViewController {
var condition: Bool = true
var creeLigueBouton: UIBarButtonItem! //Don't create an IBOutlet
@IBAction func hide(sender: AnyObject) {
if(condition == true) {
navigationItem.rightBarButtonItems = []
condition = false
} else {
navigationItem.rightBarButtonItems = [creeLigueBouton]
condition = true
}
}
override func viewDidLoad() {
super.viewDidLoad()
creeLigueBouton = UIBarButtonItem(title: "Creer", style: UIBarButtonItemStyle.Plain, target: self, action: "creerButtonMethod")
navigationItem.rightBarButtonItems = [creeLigueBouton]
}
func creerButtonMethod() {
print("Bonjour")
}
}
下面的解决方案适合我
var skipButton: UIButton = UIButton.buttonWithType(UIButtonType.Custom) as UIButton
skipButton.frame = CGRectMake(10.0, 0.0, 58.0, 32.0);
skipButton.setTitle("Skip", forState: UIControlState.Normal)
skipButton.setTitleColor(UIColor(red: 0.0, green: 122.0/255.0, blue: 255.0/255.0, alpha: 1.0), forState: UIControlState.Normal)
skipButton.addTarget(self, action: "rightButtonAction:", forControlEvents: UIControlEvents.TouchUpInside)
var skipButtonItem = UIBarButtonItem(customView: skipButton)
self.navigationItem.rightBarButtonItem = skipButtonItem;
if hideSkipButton == true {
self.navigationItem.rightBarButtonItem = nil
}
我的工具栏也有同样的问题,我不得不隐藏并显示它的最后一个按钮。因此,我声明了一个var来保存uibarbuttonite,并将其从栏中移除或添加,具体取决于以下情况: 在类内部声明了var并链接了工具栏:
var buttonToHide : UIBarButtonItem?
@IBOutlet weak var toolbarOne: UIToolbar!
在viewDidLoad中:
buttonToHide = toolbarOne.items![toolbarOne.items!.count - 1] as? UIBarButtonItem
在我的代码中,我做了一个技巧:
if situationOccurrsToHide {
toolbarOne.items!.removeLast()
}
或
您可以使用removeAtIndex或insert(buttonToHide,atIndex:xx)在特定位置移除或重新插入按钮
必须小心不要多次插入或移除按钮
希望有帮助。第一种方法: 只需将
.title
设置为”
第二种方式:
只要调用updateToolBar()
就可以了,只要你想显示/隐藏creeLigueBouton
func updateToolBar() {
var barItems: [UIBarButtonItem] = []
if condition != true {
// Make it appear
barItems.append(creeLigueBouton)
}
barItems.append(anotherButton)
myToolBar.setItems(barItems, animated: true)
myToolBar.setNeedsLayout()
}
以下是我的解决方案:
隐藏:
展示:
如果您有一组要隐藏的
UIBarButtonItem
s,例如,仅在横向显示它们,以及隐藏或纵向显示它们,则可以使用标记和Swift数组的过滤器。假设我们制作了@IBOutlet
链接到UIToolBar
:
@IBOutlet weak var toolbar: UIToolbar!
首先,我们将工具栏的项目保存在viewDidLoad
中:
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
toolbarItems = toolbar.items
}
将要在横向方向上显示的UIBarButtonItem的tag属性设置为1或任意值。然后,重写functraitCollectionDidChange
override func traitCollectionDidChange(previousTraitCollection: UITraitCollection?) {
super.traitCollectionDidChange(previousTraitCollection)
switch (traitCollection.horizontalSizeClass, traitCollection.verticalSizeClass) {
case (.Compact, .Regular): // iPhone Portrait
let items: [UIBarButtonItem]?
if view.frame.width > 320 { // iPhone 6 & 6S
items = toolbarItems?.filter({ $0.tag < 5 })
} else {
items = toolbarItems?.filter({ $0.tag < 4 })
}
bottomToolbar.setItems(items, animated: true)
case (_, .Compact): // iPhone Landscape
let items = toolbarItems?.filter({ $0.tag < 6 })
bottomToolbar.setItems(items, animated: true)
default: // iPad
break
}
}
override func traitCollectionDidChange(以前的traitcollection:UITraitCollection?){
super.traitCollectionDidChange(以前的traitCollection)
交换机(traitCollection.horizontalSizeClass、traitCollection.verticalSizeClass){
大小写(.Compact,.Regular)://iPhone肖像
让项目:[uibarbuttonite]?
如果view.frame.width>320{//iPhone 6和6S
items=toolbarItems?.filter({$0.tag<5})
}否则{
items=toolbarItems?.filter({$0.tag<4})
}
bottomToolbar.setItems(项目,动画:true)
大小写(_,.Compact)://iPhone横向
let items=toolbarItems?.filter({$0.tag<6})
bottomToolbar.setItems(项目,动画:true)
默认值://iPad
打破
}
}
在本例中,我将iPad的all
uibarbuttoneim
标记仅设为6,iPhone横向设为5,iphone6&6+设为4 可以使用文本属性隐藏条形按钮:
barButton.enabled = false
barButton.setTitleTextAttributes([NSForegroundColorAttributeName : UIColor.clearColor()], forState: .Normal)
此外,我还使用一个隐藏属性对uibarbuttonite进行了扩展:
extension UIBarButtonItem {
var titleTextAttributes: [NSObject : AnyObject]! {
set {
setTitleTextAttributes(newValue, forState: .Normal)
}
get {
return titleTextAttributesForState(.Normal)
}
}
private static var savedAttributesKey = "savedAttributes"
var savedAttributes: [NSObject : AnyObject]? {
set {
objc_setAssociatedObject(self, &UIBarButtonItem.savedAttributesKey, newValue, UInt(OBJC_ASSOCIATION_RETAIN_NONATOMIC))
}
get {
return objc_getAssociatedObject(self, &UIBarButtonItem.savedAttributesKey) as? [NSObject : AnyObject]
}
}
var hidden: Bool {
set {
enabled = !newValue
if newValue {
savedAttributes = titleTextAttributes
// Set a clear text color
var attributes = titleTextAttributes
attributes[NSForegroundColorAttributeName] = UIColor.clearColor()
titleTextAttributes = attributes
}
else {
titleTextAttributes = savedAttributes
}
}
get {
return enabled
}
}
}
试试这个。(使newbackbutton成为全局变量)
重写func viewDidLoad(){
我是这样做的:
navigationItem.setHidesBackButton(true, animated: true)
使用已启用的属性和“着色颜色”
let barButtonItem:UIBarButtonItem? = nil
if isHidden{
barButtonItem?.enabled = false
barButtonItem?.tintColor = UIColor.clearColor()
}else{
barButtonItem?.enabled = true
barButtonItem?.tintColor = nil
}
编辑:删除强制展开和固定启用值。用于Swift 3
if (your_condition) {
self.navigationItem.rightBarButtonItem = self.addAsset_btn
}
else {
// hide your button
self.navigationItem.rightBarButtonItem = nil
}
我有两个以上的menuitem,删除/添加menuitem是一项开销。这个代码片段对我很有用(使用Swift3)
func showMenuItem(){
menuItemQuit.customView?.isHidden = false
menuItemQuit.plainView.isHidden = false
}
func hideMenuItem(){
menuItemQuit.customView?.isHidden = true
menuItemQuit.plainView.isHidden = true
}
现在回复已经很晚了,但是我找到了这个主题来寻找我的问题的答案。标记的答案对我没有帮助,但由于@haiLong的答案,我成功地解决了我的问题。我认为我的解决方案适用于所有类型的条形按钮……我认为。将其添加到您的ViewController中,并根据需要使用
var tintColorsOfBarButtons = [UIBarButtonItem: UIColor]()
func hideUIBarButtonItem(button: UIBarButtonItem) {
if button.tintColor != UIColor.clear {
tintColorsOfBarButtons[button] = button.tintColor
button.tintColor = UIColor.clear
button.isEnabled = false
}
}
func showUIBarButtonItem(button: UIBarButtonItem) {
if tintColorsOfBarButtons[button] != nil {
button.tintColor = tintColorsOfBarButtons[button]
}
button.isEnabled = true
}
我希望它能为其他开发人员节省一些时间:)非常感谢这正是我所寻找的,并且我正在寻找一个禁用的按钮。有可能修改文本颜色吗?寻找了很长时间,这是到目前为止的完美答案。@JSA986是的……这是真的(第二种方法可以工作,即使条形按钮项没有标题)第二种方法不起作用,除非你创建一个强大的outlet引用或实例化你的按钮程序MaticallyTanks,伙计!为我工作。太棒了!工作得很好。这很好,但如果你的UIBarButtonim包含自定义视图,它就不起作用,如果它包含自定义视图,你可以直接在该视图上调用hidden。这正是我想要的,谢谢你发布你的自定义视图解决方案
navigationItem.setHidesBackButton(true, animated: true)
let barButtonItem:UIBarButtonItem? = nil
if isHidden{
barButtonItem?.enabled = false
barButtonItem?.tintColor = UIColor.clearColor()
}else{
barButtonItem?.enabled = true
barButtonItem?.tintColor = nil
}
Try these:
self.navigationController?.navigationBar.backItem?.title = ""
navigationItem.backBarButtonItem?.title = ""
navigationItem.leftBarButtonItem?.title = ""
navigationItem.hidesBackButton = true
navigationItem.setLeftBarButtonItem(nil, animated: true)
navigationItem.setRightBarButtonItem(nil, animated: true)
// Nice answer haiLong, I think as an extension this is more convenient.
extension UIBarButtonItem {
var isHidden: Bool {
get {
return !isEnabled && tintColor == .clear
}
set {
tintColor = newValue ? .clear : nil
isEnabled = !newValue
}
}
}
if (your_condition) {
self.navigationItem.rightBarButtonItem = self.addAsset_btn
}
else {
// hide your button
self.navigationItem.rightBarButtonItem = nil
}
func showMenuItem(){
menuItemQuit.customView?.isHidden = false
menuItemQuit.plainView.isHidden = false
}
func hideMenuItem(){
menuItemQuit.customView?.isHidden = true
menuItemQuit.plainView.isHidden = true
}
var tintColorsOfBarButtons = [UIBarButtonItem: UIColor]()
func hideUIBarButtonItem(button: UIBarButtonItem) {
if button.tintColor != UIColor.clear {
tintColorsOfBarButtons[button] = button.tintColor
button.tintColor = UIColor.clear
button.isEnabled = false
}
}
func showUIBarButtonItem(button: UIBarButtonItem) {
if tintColorsOfBarButtons[button] != nil {
button.tintColor = tintColorsOfBarButtons[button]
}
button.isEnabled = true
}