iOS中的谓词（NSPredicate）使用
看了这遍文章，对照着写了以下Demo。一般性的使用基本够了。
//: Playground - noun: a place where people can play
import UIKit
import Foundation
//1.比较运算符
func demoComparationOperator()
{
{
let testNum = 123
let predict = NSPredicate(format: "self == 123")
predict.evaluate(with: testNum)
}();
{
let testNum = 123
let predict = NSPredicate(format: "self < 123")
predict.evaluate(with: testNum)
}();
{
let testNum = 122
let predict = NSPredicate(format: "self != 123")
predict.evaluate(with: testNum)
}();
{
let testNum = 123
let predict = NSPredicate(format: "self BETWEEN {100,200}")
predict.evaluate(with: testNum)
}();
{
let testNum = "HELLO"
let predict = NSPredicate(format: "self == \"HELLO\"")
predict.evaluate(with: testNum)
}();
{
let testNum = "HELLO"
let predict = NSPredicate(format: "self <= \"HELLO WORLD\"")
predict.evaluate(with: testNum)
}();
}
func demoLogic()
{
{
let testArray = [1,2,3,4,5,6,7]
let predict = NSPredicate(format: "self > 2 && self <= 5")
(testArray as NSArray).filtered(using: predict)
}();
{
let testArray = [1,2,3,4,5,6,7]
let predict = NSPredicate(format: "self <= 2 or self >= 5")
(testArray as NSArray).filtered(using: predict)
}();
{
let testArray = [1,2,3,4,5,6,7]
let predict = NSPredicate(format: "!(self >= 2)")
(testArray as NSArray).filtered(using: predict)
}();
}
func demoString()
{
{
let testString = "hello world"
let predict = NSPredicate(format: "self beginswith \"hello\"")
predict.evaluate(with: testString)
}();
{
let testString = "hello world"
let predict = NSPredicate(format: "self endswith \"world\"")
predict.evaluate(with: testString)
}();
{
let testString = "hello world"
let predict = NSPredicate(format: "self contains \"hello\"")
predict.evaluate(with: testString)
}();
{
let testString = "HELLO world"
let predict = NSPredicate(format: "self contains[CD] \"hello\"")
predict.evaluate(with: testString)
}();
{
let testString = "HELLO world"
let predict = NSPredicate(format: "self LIKE[CD] \"?ello*\"")
predict.evaluate(with: testString)
}();
{
let testString = "666666"
let predict = NSPredicate(format: "self matches \"[1-9]{6}\"")
predict.evaluate(with: testString)
}();
}
func demoSetOperation()
{
{
let filterArray : NSArray = ["ab","abc"]
let array : NSArray = ["a","ab","abc","abcd"]
let predict = NSPredicate(format: "not (self in %@)", filterArray)
array.filtered(using: predict)
}();
{
let filterArray : NSArray = ["ab","abc"]
let array : NSArray = ["ab","ab","abc","abc","abcd"]
let predict = NSPredicate(format: "all self in %@", filterArray)
predict.evaluate(with: array)
}();
{
let filterArray : NSArray = ["ab","abc"]
let array : NSArray = ["abdd","abdd","abcdd","abcdd","abcdd","ab"]
let predict = NSPredicate(format: "none self in %@", filterArray)
predict.evaluate(with: array)
}();
{
let filterArray : NSArray = ["ab","abc"]
let array : NSArray = ["abdd","abdd","abcdd","abcdd","abcdd","ab"]
let predict = NSPredicate(format: "any self in %@", filterArray)
predict.evaluate(with: array)
}();
{
let testDic : NSArray = [["age":18],["age":19],["age":20],["age":21]]
let predict = NSPredicate(format: "any self.age < 19 && array[SIZE] == 4")
predict.evaluate(with: testDic)
}();
{
let testArray : NSArray = [["age":18],["age":19],["age":20],["age":21]]
let predict = NSPredicate(format: "self.age <= 19")
testArray.filtered(using: predict)
}();
}
demoComparationOperator()
demoLogic()
demoString()
demoSetOperation()