[英]Blur effect - Background UITextField
我使用Swift 2和Xcode 7。
我想模糊我的UITextField的背景。 我还没有找到一个属性backgroundView
。 仅background
(用于背景图像)或backgroundColor
。
我本来是要在后台添加视图的。 但是我不知道如何制作一个UITextField。
你有解决方案吗 ?
您只能添加某种视图以使其成为模糊视图。 现在的问题是,文本字段没有backgroundView属性,但它们确实具有background属性,我们可以在其中设置UIImage
。 所以我们也可以从UIView
制作UIImage
此方法将为传递的UIView创建一个UIImage。
func imageWithView(view:UIView)->UIImage{
UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, 0.0)
view.layer.renderInContext(UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
现在,我们将使用可用于iOS 8+的UIBlurEffect
和UIVisualEffectView
//only apply the blur if the user hasn't disabled transparency effects
if !UIAccessibilityIsReduceTransparencyEnabled() {
let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.Light)
//you can try for more values like .ExtraLight and .Dark
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = textField.bounds
blurEffectView.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
textField.backgroundColor = UIColor.clearColor()
//Set the blurred image made from blurred view as textfield's background
textField.background = imageWithView(blurEffectView)
}
对于Swift 3.0
func imageWithView(view:UIView)->UIImage {
UIGraphicsBeginImageContextWithOptions(view.bounds.size, false, 0.0)
view.layer.render(in: UIGraphicsGetCurrentContext()!)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image!
}
if !UIAccessibilityIsReduceTransparencyEnabled() {
let blurEffect = UIBlurEffect(style: UIBlurEffectStyle.light)
//you can try for more values like .extraLight and .dark
let blurEffectView = UIVisualEffectView(effect: blurEffect)
blurEffectView.frame = textField.bounds
blurEffectView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
textField.backgroundColor = UIColor.clear
//Set the blurred image made from blurred view as textfield's background
textField.background = imageWithView(view: blurEffectView)
}
这是所附的屏幕截图
希望这可以帮助
你有解决方案吗?
您始终可以将透明文本字段放在另一个视图的顶部 。 如果该视图恰好具有与文本字段相同的大小,则它看起来就像文本字段的背景视图。 您甚至可以使文本字段成为“背景”视图的子视图,以便您可以更轻松地将它们一起移动。
您可以将背景色设置为白色,并更改其Alpha值:
myTextField.alpha = 0.5;
可能与您的要求不完全相同,但是易于实现。
Swift 5,Xcode 10:
我通过子类化UIView类来做到这一点,并向其中添加了模糊效果和文本字段:
import UIKit
class BlurryTextField: UIView {
private lazy var blurView: UIVisualEffectView = {
let blurEffect = UIBlurEffect(style: .light)
let blurView = UIVisualEffectView(effect: blurEffect)
blurView.translatesAutoresizingMaskIntoConstraints = false
blurView.clipsToBounds = true
blurView.autoresizingMask = [.flexibleWidth, .flexibleHeight]
return blurView
}()
lazy var textField: UITextField = {
let view = UITextField()
view.translatesAutoresizingMaskIntoConstraints = false
view.backgroundColor = .clear
return view
}()
override init(frame: CGRect) {
super.init(frame: frame)
self.layer.cornerRadius = 10
self.clipsToBounds = true
self.backgroundColor = .clear
setupConstraints()
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
private func setupConstraints() {
self.addSubview(blurView)
self.addSubview(textField)
blurView.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
blurView.trailingAnchor.constraint(equalTo: self.trailingAnchor).isActive = true
blurView.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
blurView.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
textField.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
textField.trailingAnchor.constraint(equalTo: self.trailingAnchor).isActive = true
textField.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
textField.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
}
}
然后在您的UIViewController中:
// Create an instance of BlurryTextField
private lazy var blurryTF: BlurryTextField = {
let view = BlurryTextField()
view.translatesAutoresizingMaskIntoConstraints = false
return view
}()
override func viewDidLoad() {
super.viewDidLoad()
// Add the instance to the top of our view
view.addSubview(blurryTF)
blurryTF.leadingAnchor.constraint(equalTo: view.leadingAnchor).isActive = true
blurryTF.trailingAnchor.constraint(equalTo: view.trailingAnchor).isActive = true
blurryTF.heightAnchor.constraint(equalToConstant: 55).isActive = true
}
这是我的方法的预览:
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