我试着去NSCoding协议添加到我的自定义类:斯威夫特:想实现NSCoding
class Convo: NSObject, NSCoding {
var name: String
var pic: UIImage
override init() {
self.name = "Dror"
self.pic = UIImage (named: "NoPic.png")!
super.init()
}
required init(coder aDecoder: NSCoder) {
self.name = aDecoder.decodeObjectForKey("name") as! String
self.pic = aDecoder.decodeObjectForKey("pic") as! UIImage
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(self.name, forKey: "name")
aCoder.encodeObject(self.pic, forKey: "pic")
}
}
但在该行弹出一个错误:
self.pic = aDecoder.decodeObjectForKey("pic") as! UIImage
在控制台中的错误是:
fatal error: unexpectedly found nil while unwrapping an Optional value
而且在Xcode的错误是:
Thread 1:EXC_BAD_INSTRUCTION(code=EXC_I386_INVOP,subcode=0x0)
而且我不知道该怎么做。
编辑: 运行此代码:
class Convo: NSObject, NSCoding {
var name: String
var pic: UIImage!
override init() {
self.name = "Dror"
self.pic = UIImage (named: "NoPic.png")!
super.init()
}
required init(coder aDecoder: NSCoder) {
self.name = aDecoder.decodeObjectForKey("name") as! String
self.pic = aDecoder.decodeObjectForKey("pic") as? UIImage
}
func encodeWithCoder(aCoder: NSCoder) {
aCoder.encodeObject(self.name, forKey: "name")
aCoder.encodeObject(self.pic, forKey: "pic")
}
}
它编译好,但self.pic到底是零,而不是UIImage的(命名为: “NoPic.png”)
你的代码是很兴奋的与所有那些感叹号所有的地方! – nhgrif