NSPredicate谓词

来源：互联网发布：java邮件功能编辑：程序博客网时间：2024/05/21 06:35

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {
    [superviewDidLoad];

    Person *per1= [Person personWithName:@"AA" age:20];
    Person *per2= [Person personWithName:@"DD" age:25];
    Person *per3= [Person personWithName:@"GG" age:92];
    Person *per4= [Person personWithName:@"KK" age:38];
    Person *per5= [Person personWithName:@"12138" age:12138];
    Person *per6= [Person personWithName:@"斯娜格" age:81];
    Person *per7= [Person personWithName:@"gakki" age:18];
    Person *per8= [Person personWithName:@"康东" age:46];
    Person *per9= [Person personWithName:@"maky3x" age:67];
    Person *per0= [Person personWithName:@"3rt" age:55];

    NSArray*persons = [NSArray arrayWithObjects:per0, per1, per2, per3, per4,per5, per6, per7, per8, per9, nil];

    //1年龄小于30
   //定义谓词对象,谓词对象中包含了过滤条件
    NSPredicate*predicate = [NSPredicate predicateWithFormat:@"age <30"];
   //使用谓词条件过滤数组中的元素,过滤之后返回查询的结果
    NSArray*array = [persons filteredArrayUsingPredicate:predicate];
    for (Person*per in array) {
       NSLog(@"1 age < 30 --> %@, %ld", per.name, per.age);
    }


    //2年龄小于30并且名字为gakki的
    predicate =[NSPredicate predicateWithFormat:@"name = 'gakki' && age< 30"];
    array =[persons filteredArrayUsingPredicate:predicate];
    for (Person*per in array) {
       NSLog(@"2 age < 30 && name = gakki --> %@, %ld",per.name, per.age);
    }


    //3 in(包含)
    predicate =[NSPredicate predicateWithFormat:@"name IN {'AA', 'D'} "];
    array =[persons filteredArrayUsingPredicate:predicate];
   NSLog(@"%ld", array.count);
    for (Person*per in array) {
       NSLog(@"3 %@, %ld", per.name, per.age);
    }

    //4name以m开头的
    predicate =[NSPredicate predicateWithFormat:@"name beginswith 'm' "];
    array =[persons filteredArrayUsingPredicate:predicate];
   NSLog(@"%ld", array.count);
    for (Person*per in array) {
       NSLog(@"4 %@, %ld", per.name, per.age);
    }

    //5name以38结尾的
    predicate =[NSPredicate predicateWithFormat:@"name endswith '38'"];
    array =[persons filteredArrayUsingPredicate:predicate];
   NSLog(@"%ld", array.count);
    for (Person*per in array) {
       NSLog(@"5 %@, %ld", per.name, per.age);
    }

    //6name中包含3x的
    predicate =[NSPredicate predicateWithFormat:@"name contains '3x'"];
    array =[persons filteredArrayUsingPredicate:predicate];
   NSLog(@"%ld", array.count);
    for (Person*per in array) {
       NSLog(@"6 %@, %ld", per.name, per.age);
    }

    //7name中包含       ?表示一个字符   *表示0个或多个字符
    //predicate= [NSPredicate predicateWithFormat:@"name like '*3?'"];
    //predicate= [NSPredicate predicateWithFormat:@"name like '?a*'"];
    predicate =[NSPredicate predicateWithFormat:@"name like '*3*'"];
    array =[persons filteredArrayUsingPredicate:predicate];
   NSLog(@"%ld", array.count);
    for (Person*per in array) {
       NSLog(@"7 %@, %ld", per.name, per.age);
    }


}

- (void)didReceiveMemoryWarning {
    [superdidReceiveMemoryWarning];
    // Disposeof any resources that can be recreated.
}

@end

0 0