[英]IOS 6 to Swift2 update Slider
有机会有人在此代码中帮助我吗?
它是一个可更改标签中字体大小的滑块。 这在IOS6中有效,但是我试图在Swift 2上运行。
提前致谢。
import UIKit
class ViewController: UIViewController {
@IBAction func defaultSlider1(sender: UISlider) {
UISlider *slide = (UISlider *)sender;
int fonts = (int)(slide.value);
NSString *newtext = NSlog("%d", fonts);
label.font = [UIFont systemFontOfSize:fonts];
label.text = newtext;
}
override func viewDidLoad() {
super.viewDidLoad()
}
}
请尝试以下示例( 演示 ):
import UIKit
class ViewController: UIViewController {
private var slider: UISlider!
private var label: UILabel!
private let minimumFontSize: Float = 16
private let maximumFontSize: Float = 48
override func viewDidLoad() {
super.viewDidLoad()
let width: CGFloat = view.bounds.width / 2
let height: CGFloat = 44.0
let size = CGSize(width: width, height: height)
let origin = CGPoint(x: self.view.center.x - (width / 2), y: self.view.center.y)
createSlider(origin, size: size)
createLabel(origin, size: size)
sliderAction()
}
func createSlider(origin: CGPoint, size: CGSize) {
let frame = CGRect(origin: origin, size: size)
self.slider = UISlider(frame: frame)
self.slider.addTarget(self,
action: Selector("sliderAction"),
forControlEvents: UIControlEvents.ValueChanged)
self.slider.minimumValue = minimumFontSize
self.slider.maximumValue = maximumFontSize
view.addSubview(self.slider)
}
func createLabel(origin: CGPoint, size: CGSize) {
let labelOrigin = CGPoint(x: origin.x, y: origin.y + size.height)
let frame = CGRect(origin: labelOrigin, size: size)
self.label = UILabel(frame: frame)
self.label.textAlignment = NSTextAlignment.Center
view.addSubview(self.label)
}
func sliderAction() {
let fontSize = CGFloat(self.slider.value)
self.label.font = UIFont.systemFontOfSize(fontSize)
self.label.text = "\(Int(fontSize))"
}
}
如果您使用情节提要 :
@IBOutlet
(从情节提要上的控件Ctrl+Drag
以进行编码,从“ Connection
列表中选择“ Outlet
) Value Changed
@IBAction
事件插入@IBAction
(从情节提要上的滑块控件进行Ctrl+Drag
进行编码,然后从“ Connection
列表中选择Action
) 您可能会得到类似以下内容的结果:
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var slider: UISlider!
@IBOutlet weak var label: UILabel!
override func viewDidLoad() {
super.viewDidLoad()
self.slider.minimumValue = 16
self.slider.maximumValue = 48
self.sliderAction()
}
@IBAction func sliderValueChangedAction(sender: UISlider) {
self.sliderAction()
}
private func sliderAction() {
let fontSize = CGFloat(self.slider.value)
self.label.font = UIFont.systemFontOfSize(fontSize)
self.label.text = "\(Int(fontSize))"
}
}
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