AND和OR结合NSPredicate。 IOS斯威夫特

Question

我的coredata get查询的动态or谓词

    var predicate = [NSPredicate]()
    //this three is or
        predicate.append(NSPredicate(format: "item_parent_id = %i", 1))
        predicate.append(NSPredicate(format: "item_parent_id = %i", 3))       
        predicate.append(NSPredicate(format: "item_parent_id = %i", 5))

    // but this one is and
        predicate.append(NSPredicate(format: "price_date CONTAINS[cd] %@", 'timestamp'))

    var compound = NSCompoundPredicate.orPredicateWithSubpredicates(predicate)

OR运算符的前三个约束，日期的最后一个约束是AND

我花了很多时间来做这件事，我是快速发展的新手，我不习惯于目标C，这就是为什么我很难转换为我在客观c中写的快速翻译。

如果可能的话，快速写下答案，任何评论和建议都将是一个很大的帮助。 提前致谢

obj c - 来源＃1
obj c - 来源＃2

Answer 1

如果你正在寻找像(a OR b OR c) AND d ，你需要两个复合谓词：

var orList = [NSPredicate]()
//this three is or
orList.append(NSPredicate(format: "item_parent_id = %i", 1))
orList.append(NSPredicate(format: "item_parent_id = %i", 3))       
orList.append(NSPredicate(format: "item_parent_id = %i", 5))
let orPredicate = NSCompoundPredicate.orPredicateWithSubpredicates(orList)

// but this one is and
let other = NSPredicate(format: "price_date CONTAINS[cd] %@", 'timestamp')

let compound = NSCompoundPredicate.andPredicateWithSubpredicates([orPredicate, other])