Ios Swift-如何更改UIButton的颜色';s NSMUTABLeAttributeString在设置之后
我有两个Ios Swift-如何更改UIButton的颜色';s NSMUTABLeAttributeString在设置之后,ios,swift,uibutton,nsmutableattributedstring,Ios,Swift,Uibutton,Nsmutableattributedstring,我有两个ui按钮,它们的标题和颜色最初是使用NSMutableAttributedString设置的。正文是 我有一个自定义的UISegmentedControl,当切换段时,我只需要更改按钮的颜色。我现在的做法是颜色确实会改变,但当这种情况发生时会出现难看的闪烁,因为实际的文本会再次设置。我只需要颜色的平滑过渡 var selectedSegmentIndex = 0 { didSet { layoutIfNeeded() UIView.animate
ui按钮
,它们的标题
和颜色
最初是使用NSMutableAttributedString
设置的。正文是
我有一个自定义的UISegmentedControl
,当切换段时,我只需要更改按钮的颜色。我现在的做法是颜色确实会改变,但当这种情况发生时会出现难看的闪烁,因为实际的文本会再次设置。我只需要颜色的平滑过渡
var selectedSegmentIndex = 0 {
didSet {
layoutIfNeeded()
UIView.animate(withDuration: 0.1) {
self.setTextForFollowersButton()
self.setTextForFollowingButton()
self.layoutIfNeeded()
}
}
}
如何仅更改按钮的NSMutableAttributedString
的颜色?
按钮代码:
var numOfFollowers = 0 {
didSet {
setTextForFollowersButton()
}
}
var numOfFollowing = 0 {
didSet {
setTextForFollowingButton()
}
}
lazy var followersButton: UIButton = {
let button = UIButton.init(type: .system)
// ...
return button
}()
lazy var followingButton: UIButton = {
let button = UIButton.init(type: .system)
//...
return button
}()
func setTextForFollowersButton() {
let button = self.followersButton
let buttonText = "Following\n\(String(numOfFollowing))" as NSString
// other code for 2 lines of text
var color = UIColor.blue
if selectedSegmentIndex == 0 {
color = UIColor.blue
} else {
color = UIColor.gray
}
let attrString1 = NSMutableAttributedString(string: substring1,
attributes: [NSMutableAttributedString.Key.font:
UIFont.boldSystemFont(ofSize: 16),
NSMutableAttributedString.Key.foregroundColor: color])
let attrString2 = NSMutableAttributedString(string: substring2,
attributes: [NSMutableAttributedString.Key.font:
UIFont.boldSystemFont(ofSize: 14),
NSMutableAttributedString.Key.foregroundColor: color])
attrString1.append(attrString2)
button.setAttributedTitle(attrString1, for: [])
}
func setTextForFollowingButton() {
let button = self.followingButton
let buttonText = "Following\n\(String(numOfFollowing))" as NSString
// other code for 2 lines of text
var color = UIColor.blue
if selectedSegmentIndex == 0 {
color = UIColor.gray
} else {
color = UIColor.blue
}
let attrString1 = NSMutableAttributedString(string: substring1,
attributes: [NSMutableAttributedString.Key.font:
UIFont.boldSystemFont(ofSize: 16),
NSMutableAttributedString.Key.foregroundColor: color])
let attrString2 = NSMutableAttributedString(string: substring2,
attributes: [NSMutableAttributedString.Key.font:
UIFont.boldSystemFont(ofSize: 14),
NSMutableAttributedString.Key.foregroundColor: color])
attrString1.append(attrString2)
button.setAttributedTitle(attrString1, for: [])
}
您应该在
DispatchQueue.main.async{}
中插入UIView.animate
函数,以实现平滑过渡。始终建议在主线程上异步制作任何类型的UI动画。另一种方法是使用UIView来实现平滑过渡,而不闪烁。无动画的性能
:
DispatchQueue.main.async {
self.layoutIfNeeded()
UIView.performWithoutAnimation {
self.setTextForFollowersButton()
self.setTextForFollowingButton()
self.layoutIfNeeded()
}
}
您是否尝试在
DispatchQueue.main.async{}
中插入UIView.animate
以使转换顺利进行?@LewWinczynski谢谢,您的回答有效。请把它寄出去,这样我就可以接受了。我不得不将时间改为0.05,这样看起来也更好。很高兴听到这个消息!好的,我会发帖的。:)@LewWinczynski这里有另一种不用动画的方法