斯威夫特 – 结合谓词
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。 还有另一种结合方式吗?
你需要NSCompoundPredicate
:
let predicate1 = NSPredicate("self.label = 'foo'")) let predicate2 = NSPredicate("self.label = 'bar'")) let compound = NSCompoundPredicate.andPredicateWithSubpredicates([predicate1, predicate2])
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])