这段代码在Swift 1.1中运行良好…只是试图找出1.2中的变化使其不兼容：
@IBAction func load_click(sender: AnyObject) {
var query = PFQuery(className: "myClass")
query.getObjectInBackgroundWithId("MPSVivtvJR",block: { (object:PFObject!,error: NSError) -> Void in
let theName = object["name"] as String
let theAge = object["age"] as Int?
println(theName)
println(theAge)
})
}
它给了我错误：无法使用类型'(String,block：(PFObject！,NSError) – > Void)的参数列表调用’GetObjectInBackgroundWithId’
有任何想法吗？谢谢！
现在使用Swift 1.2,你应该更加小心打开选项.因此,在具有PFObject和NSError的闭包内,要么删除感叹号,要么添加问号以使其成为可选项.
原文链接：https://www.f2er.com/swift/319874.html然后,更安全地打开您的物体.尝试如下：
// You can create this in a separate file where you save your models
struct myUser {
let name: String?
let age: Int?
}
// Now this in the view controller
@IBAction func load_click(sender: AnyObject) {
var query = PFQuery(className: "myClass")
query.getObjectInBackgroundWithId("MPSVivtvJR",block: {
(object:PFObject!,error: NSError?) -> Void in
if let thisName = object["name"] as? String{
if let thisAge = object["age"] as? Int{
let user = myUser(name: thisName,age: thisAge)
println(user)
}
}
})
}
