本文介绍了iOS自定义渐变背景UIView将不会显示在模拟器中的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我在启动屏幕上有一个自定义渐变背景,该外观在XCode的Interface Builder中看起来和正常工作,但不会在模拟器中显示.发生什么事了?
I have a custom gradient background on my launch screen which looks and works fine in Interface Builder in XCode but won't display in simulator. What's happening?
import UIKit
@IBDesignable
open class LaunchBkg: UIView {
private lazy var gradientLayer: CAGradientLayer = {
let gradientLayer = CAGradientLayer()
gradientLayer.frame = self.bounds
gradientLayer.colors = [#colorLiteral(red: 0.2588235294, green: 0.8, blue: 0.8352941176, alpha: 1).cgColor, #colorLiteral(red: 0, green: 0.5764705882, blue: 0.9098039216, alpha: 1).cgColor]
return gradientLayer
}()
override init(frame: CGRect) {
super.init(frame: frame)
layer.insertSublayer(gradientLayer, at: 0)
}
public required init?(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
layer.insertSublayer(gradientLayer, at: 0)
}
open override func layoutSubviews() {
super.layoutSubviews()
gradientLayer.frame = bounds
}
}
推荐答案
是的.
启动屏幕只是应用程序启动时出现的图像.根据定义,您的应用尚未启动;这就是为什么我们需要启动屏幕来覆盖代码运行之前的时间间隔的原因.因此,根据定义,您的代码尚未开始运行.您不能通过代码影响启动屏幕.
The launch screen is just an image that appears while your app is launching. By definition, your app has not launched yet; that is why we need a launch screen, to cover the gap of time before your code runs. Thus, also by definition, your code has not yet begun to run. You cannot affect the launch screen by means of code.
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