数组 – Xcode Swift检查数组是否包含对象

var preferiti : [ModalHomeLine!] = []

if the object exists {

} else {
  var addPrf = ModalHomeLine(titolo: nomeLinea,link: linkNumeroLinea,immagine : immagine,numero : titoloLinea)
  preferiti.append(addPrf)
}

所以听起来你想要一个没有重复对象的数组.在这种情况下,一套就是你想要的.令人惊讶的是,Swift没有一个集合,所以你可以创建自己的或使用NSSet,它看起来像这样：

let myset = NSMutableSet()
myset.addObject("a") // ["a"]
myset.addObject("b") // ["a","b"]
myset.addObject("c") // ["a","b","c"]
myset.addObject("a") // ["a","c"] NOTE: this doesn't do anything because "a" is already in the set.

更新：

Swift 1.2添加了一套类型！现在你可以做点什么了

let mySet = Set<String>()
mySet.insert("a") // ["a"]
mySet.insert("b") // ["a","b"]
mySet.insert("c") // ["a","c"]
mySet.insert("a") // ["a","c"] NOTE: this doesn't do anything because "a" is already in the set.