我正试图用滑块改变UIView的宽度。我的问题是,我的代码不是更新视图宽度,而是添加新视图。我不知道如何使用swift playground更新视图。
import UIKit
import PlaygroundSupport
class MyViewController : UIViewController {
var feelings01Slider: UISlider!
var feelingsWidth01 = 100
var dayFeelings01: UIView!
var dayFeelings02: UIView!
var dayFeelings03: UIView!
override func loadView() {
let view = UIView()
view.backgroundColor = .white
self.view = view
feelings01Slider = UISlider()
feelings01Slider.frame = CGRect(x: 62, y: 375, width: 250, height: 20)
feelings01Slider.minimumValue = 1
feelings01Slider.maximumValue = 248
feelings01Slider.value = 100
feelings01Slider.isContinuous = true
feelings01Slider.addTarget(self, action: #selector(sliderValueDidChange(sender:)), for: .valueChanged)
setUpFeelings()
view.addSubview(feelings01Slider)
}
func setUpFeelings() {
feelingsWidth01 = Int(feelings01Slider.value)
var feelingsX02 = feelingsWidth01 + 62
var feelingsWidth02 = 80
var feelingsX03 = feelingsX02 + feelingsWidth02
var feelingsWidth03 = 70
dayFeelings01 = UIView(frame: CGRect(x: 62, y: 100, width: feelingsWidth01, height: 250))
dayFeelings01.backgroundColor = .yellow
dayFeelings02 = UIView(frame: CGRect(x: feelingsX02, y: 100, width: feelingsWidth02, height: 250))
dayFeelings02.backgroundColor = .blue
dayFeelings03 = UIView(frame: CGRect(x: feelingsX03, y: 100, width: feelingsWidth03, height: 250))
dayFeelings03.backgroundColor = .red
view.addSubview(dayFeelings01)
view.addSubview(dayFeelings02)
view.addSubview(dayFeelings03)
}
@objc func sliderValueDidChange(sender:UISlider) {
feelingsWidth01 = Int(sender.value)
dayFeelings03.removeFromSuperview()
dayFeelings02.removeFromSuperview()
dayFeelings01.removeFromSuperview()
setUpFeelings()
}
}
// Present the view controller in the Live View window
PlaygroundPage.current.liveView = MyViewController()
我是编程新手,所以如果我的代码看起来很混乱,请原谅。
您不需要使用不同大小的新视图替换视图。你可以改变他们的框架。用以下方法替换滑块选择器操作:
@objc func sliderValueDidChange(sender:UISlider) {
dayFeelings01.frame.size.width = CGFloat(sender.value)
}
注意:因为首先添加黄色视图,所以它在其他视图下方展开。这就是为什么你看不到它变宽的原因。尝试更改订单,以便最后添加,您将看到它。如果您希望其他视图调整到可用空间,您也可以更新它们的帧,UIStackView可能会很容易。
祝好运!