有没有办法在Swift中组合谓词?例如:
let predicate1 = NSPredicate("self.label = 'foo'"))
let predicate2 = NSPredicate("self.label = 'bar'"))
let combinedPredicate = NSPredicate("self.staticTexts.elementMatchingPredicate(%@).exists AND
self.staticTexts.elementMatchingPredicate(%@).exists", predicate1, predicate2)
这给了我一个错误,说谓词不能成为其他谓词的参数。还有另一种方法可以将它们结合起来吗?
答案 0 :(得分:20)
let predicate1 = NSPredicate("self.label = 'foo'"))
let predicate2 = NSPredicate("self.label = 'bar'"))
let compound = NSCompoundPredicate.andPredicateWithSubpredicates([predicate1, predicate2])
答案 1 :(得分:5)
let predicate1:NSPredicate = NSPredicate("self.label = 'foo'")
let predicate2:NSPredicate = NSPredicate("self.label = 'bar'")
let compound:NSCompoundPredicate = NSCompoundPredicate(andPredicateWithSubpredicates: [predicate1,predicate2])
self.filteredArray = self.array.filteredArrayUsingPredicate(compound)
self.table.reloadData()
您也可以根据您的不同要求使用它
let compound:NSCompoundPredicate = NSCompoundPredicate(orPredicateWithSubpredicates: [predicate1,predicate2])