将我的项目转换为
swift 3后,我得到以下值“String”,该块中的第一行没有成员“stringByTrimmingCharactersInSet”错误：
extension UIColor {
convenience init (hex:String) {
var cString:String = hex.stringByTrimmingCharactersInSet(NSCharacterSet.whitespaceAndNewlineCharacterSet()).uppercased() // error appears on this line
if (cString.hasPrefix("#")) {
cString = (cString as NSString).substring(from: 1)
}
let rString = (cString as NSString).substring(to: 2)
let gString = ((cString as NSString).substring(from: 2) as NSString).substring(to: 2)
let bString = ((cString as NSString).substring(from: 4) as NSString).substring(to: 2)
var r:CUnsignedInt = 0,g:CUnsignedInt = 0,b:CUnsignedInt = 0;
Scanner(string: rString).scanHexInt32(&r)
Scanner(string: gString).scanHexInt32(&g)
Scanner(string: bString).scanHexInt32(&b)
self.init(red: CGFloat(r) / 255.0,green: CGFloat(g) / 255.0,blue: CGFloat(b) / 255.0,alpha: CGFloat(1))
}
}
我猜这个错误是由于’stringByTrimmingCharactersInSet’的语法变化而导致的.这个更正是什么？
解决方法
新的语法是这样的：
var cString = hex.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines).uppercased()
作为一个建议,您不需要指定cString是一个字符串,因为这是假定与您分配给它的值.
