我尝试通过创建使用滑块来选择红、绿、蓝和透明度值的颜色来改变我的应用程序的按钮颜色。因此,我创建了一个变量来保存用户创建的颜色。
ViewController是按钮所在的位置。 ChangeColors是RGB滑块系统。
import UIKit
import Foundation
var buttonColor = UIColor()
class ViewController: UIViewController {
@IBOutlet var tools: UIButton!
@IBOutlet var custom: UIButton!
@IBOutlet var support: UIButton!
@IBOutlet var donate: UIButton!
override func viewDidLoad() {
super.viewDidLoad()
tools.backgroundColor = buttonColor
custom.backgroundColor = buttonColor
support.backgroundColor = buttonColor
donate.backgroundColor = buttonColor
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
第二个是RGB滑块系统的代码。
import Foundation
import UIKit
class ChangeColors: UIViewController {
@IBOutlet var Red: UISlider!
@IBOutlet var Green: UISlider!
@IBOutlet var Blue: UISlider!
@IBOutlet var Alpha: UISlider!
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func preview(sender: AnyObject) {
let rVal = CGFloat(Red.value)
let gVal = CGFloat(Green.value)
let bVal = CGFloat(Blue.value)
let aVal = CGFloat(Alpha.value)
self.view.backgroundColor = UIColor(red: rVal, green: gVal, blue: bVal, alpha: aVal)
}
@IBAction func change(sender: AnyObject) {
let rVal = CGFloat(Red.value)
let gVal = CGFloat(Green.value)
let bVal = CGFloat(Blue.value)
let aVal = CGFloat(Alpha.value)
let color = UIColor(red: rVal, green: gVal, blue: bVal, alpha: aVal)
buttonColor = color
}
}
但是这个应用程序在打开时立即崩溃,并出现以下错误:
Terminating app due to uncaught exception 'NSInvalidArgumentException',reason:'*** -CGColor not defined for the UIColor; need to first convert colorspace.'
我真的需要帮助。谢谢。