Swift 如何在故事板上使用@designable查看此设计
我在用掩蔽 我的代码:Swift 如何在故事板上使用@designable查看此设计,swift,xcode,uiimageview,ibdesignable,Swift,Xcode,Uiimageview,Ibdesignable,我在用掩蔽 我的代码: class ViewController: UIViewController { @IBOutlet weak var firstImageView: UIImageView! @IBOutlet weak var seconImageView: UIImageView! let maskView = UIImageView() let maskView2 = UIImageView() override func view
class ViewController: UIViewController {
@IBOutlet weak var firstImageView: UIImageView!
@IBOutlet weak var seconImageView: UIImageView!
let maskView = UIImageView()
let maskView2 = UIImageView()
override func viewDidLoad() {
super.viewDidLoad()
maskView.image = UIImage(named: "Up")
maskView2.image = UIImage(named: "Down")
firstImageView.mask = maskView
seconImageView.mask = maskView2
}
override func viewDidLayoutSubviews() {
super.viewDidLayoutSubviews()
maskView.frame = firstImageView.bounds
maskView2.frame = seconImageView.bounds
}
}
UIImageView代码:
UIImageView类。我看不到这个设计。我该怎么办?我添加了自定义类,但不起作用
@IBDesignable
class FirstImageView: UIImageView {
var maskkView: UIImageView!
override init(frame: CGRect) {
super.init(frame: frame)
layoutSubviews()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
layoutSubviews()
}
override func layoutSubviews() {
super.layoutSubviews()
maskkView.image = UIImage(named: "mask")
mask = maskkView
maskkView.frame = bounds
}
}
情节提要:
模拟器:
如何在故事板上使用@designable查看此设计
我添加了自定义类,但不起作用
@IBDesignable
class FirstImageView: UIImageView {
var maskkView: UIImageView!
override init(frame: CGRect) {
super.init(frame: frame)
layoutSubviews()
}
required init?(coder: NSCoder) {
super.init(coder: coder)
layoutSubviews()
}
override func layoutSubviews() {
super.layoutSubviews()
maskkView.image = UIImage(named: "mask")
mask = maskkView
maskkView.frame = bounds
}
}
我向您保证,IBDesignable
UIImageView的layoutSubviews
中的掩蔽确实有效。例如:
@IBDesignable
class MyImageView : UIImageView {
override func layoutSubviews() {
super.layoutSubviews()
let lay = CAShapeLayer()
lay.frame = self.bounds
lay.path = UIBezierPath(ovalIn: self.bounds).cgPath
self.layer.mask = lay
}
}
结果:
我怀疑您的代码有问题,因为您正试图在
IBDesignable
代码中加载带有UIImage(名称:)
的捆绑包中的图像;我猜那是行不通的<代码>IBDesignable代码只是在故事板渲染时运行的一些东西;它不能表现得像是真正的运行应用程序。你的@IBDesignable
UIView代码在哪里?@matt更新了我的问题。谢谢,先生:)但我正在使用另一个三角形png图像进行掩蔽。我在试着做一个三角形。我做不到。我该怎么做?如果我是对的,您不能在IBDesignable的代码中加载图像,那么您应该像我在示例中所做的那样:在代码中将三角形本身绘制为UIBezierPath。