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[操作系统]微词(过滤)


个人认为微词是个很不错的东西

1.自定义对象

@interface Person : NSObject@property(nonatomic , copy)NSString * name;@property(nonatomic , assign)int age;@property (nonatomic , retain)NSArray * familys;@end

2.简单实用(数据比较)

- (void)testObject1 {  Person *person = [[Person alloc] init];  person.name = @"gulong";  person.age = 24;  //整形比较  NSPredicate * pred = [NSPredicate predicateWithFormat:@"age > 25"];  BOOL match = [pred evaluateWithObject:person];  NSLog(@"%s",(match)?"YES":"NO");
//printf: NO}

3.通配符和正则

- (void)testObject2 {  /*   BEGINSWITH:检查某个字符串是否以另一个字符串开头。   ENDSWITH:检查某个字符串是否以另一个字符串结尾。   CONTAINS:检查某个字符串是否以另一个字符串内部。   [c]不区分大小写[d]不区分发音符号即没有重音符号[cd]既不区分大小写,又不区分发音符号。   */  Person *person = [[Person alloc] init];  person.name = @"gulong";  person.age = 24;    /* 通配符 */  NSPredicate *predicate1 = [NSPredicate predicateWithFormat:@"name LIKE[cd] '*er*'"];     //*代表通配符Like还接受[cd].  predicate1 = [NSPredicate predicateWithFormat:@"name LIKE[cd] '???er*'"];  //?只匹配一个字符并且还可以接受[cd].  //*表示有多个占位符  /* 正则匹配 */  NSString *regex = @"[A-Za-z]+";  NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", regex];    if ([predicate evaluateWithObject:@"huang"]) {    NSLog(@"字符串是否为纯字母");  }  //printf 字符串是否为纯字母
}

4.数组的过滤1(里面的每个对象都是字符串)

- (void)testArray1 {  NSArray *array = [[NSArray alloc]initWithObjects:@"beijing",@"shanghai",@"guangzou",@"wuhan", nil];  NSString *string = @"ang"; //获取带有ang的所有字符串,然后形成一个数组  NSPredicate *pred = [NSPredicate predicateWithFormat:@"SELF CONTAINS %@",string];  NSLog(@"%@",[array filteredArrayUsingPredicate:pred]);  //printf: shanghai,guangzou}

 5.数组的过滤2 (使用自定义的person类)

- (void)testArray2 {  Person *person1 = [[Person alloc] init];  person1.name = @"long";  person1.age = 23;    Person *person2 = [[Person alloc] init];  person2.name = @"gu";  person2.age = 23;    Person *person3 = [[Person alloc] init];  person3.name = @"long";  person3.age = 24;  NSArray *persons = @[person1,person2,person3];  //直接使用对象里面的属性就可以了,不能使用数组的某个对象名(其实  NSPredicate *pred = [NSPredicate predicateWithFormat:@"name == 'long'"]; //相等  // (age > 23) AND (age < 26)  AND 两者都要满足,OR 两种满足其一就可  // age between {23,26}  从23 到26之间  //@"name IN { 'Herbie', 'Snugs', 'Badger', 'Flap' }"; //包含在其中用IN  NSArray *array = [persons filteredArrayUsingPredicate:pred];  NSLog(@"array %@",[array description]);  }

6.数组过滤3(对象里面还有数据)

@property (nonatomic , retain)NSArray * familys;  //person.h

 

- (void)testArray3 {  Person *person1 = [[Person alloc] init];  person1.name = @"huang";  person1.age = 23;  person1.familys = @[@"zhuge",@"zhangfei",@"liubei"];    Person *person2 = [[Person alloc] init];  person2.name = @"gu";  person2.age = 23;  person2.familys = @[@"suiquan",@"huanggai",@"lusun"];    Person *person3 = [[Person alloc] init];  person3.name = @"huang";  person3.age = 24;  person3.familys = @[@"caochao",@"xiahou",@"caozhi"];    NSArray *persons = @[person1,person2,person3];  /*   * 数组包含时必须为 整个字符串,不是是部分(比如 huanggai 的 huang;这样是无数据的)   */  NSPredicate *pred = [NSPredicate predicateWithFormat:@"familys CONTAINS 'huanggai'"];  NSArray *array = [persons filteredArrayUsingPredicate:pred];  NSLog(@"array %@",[array description]); //打印 person2}