iOS-OC-基础-NSPredicate常用方法

NSpredicate 常用方法

    // 谓词的条件查询 > 、< 、==、!=

    NSPredicate *predicate1 = [NSPredicate predicateWithFormat:@"age > 20"];

    NSArray *arr1 = [stuArray filteredArrayUsingPredicate:predicate1];

    NSLog(@"arr1 = %@",arr1);

    //使用表达式

    NSPredicate *predicate2 = [NSPredicate predicateWithFormat:@"age > 20 && height > 170"];

    NSArray *arr2 = [stuArray filteredArrayUsingPredicate:predicate2];

    NSLog(@"arr2 = %@",arr2);

    // 字符串作为条件要使用单引号‘’，name == 'lisi'

    NSPredicate *predicate3 = [NSPredicate predicateWithFormat:@"name == 'lisi'"];

    NSArray *arr3 = [stuArray filteredArrayUsingPredicate:predicate3];

    NSLog(@"arr3 = %@",arr3);

    // 使用占位符

    NSPredicate *predicate4 = [NSPredicate predicateWithFormat:@"age == %ld",];

    NSArray *arr4 = [stuArray filteredArrayUsingPredicate:predicate4];

    NSLog(@"arr4 = %@",arr4);

    // IN {'lisi','wangwu'} 在包含的条件内

    NSPredicate *predicate5 = [NSPredicate predicateWithFormat:@"height IN {165,180}"];

    NSArray *arr5 = [stuArray filteredArrayUsingPredicate:predicate5];

    NSLog(@"arr5 = %@",arr5);

    //BEGINSWITH 以什么字符串开头

    NSPredicate *predicate6 = [NSPredicate predicateWithFormat:@"name BEGINSWITH[c] 'R'"];

    NSArray *arr6 = [stuArray filteredArrayUsingPredicate:predicate6];

    NSLog(@"arr6 = %@",arr6);

    // ENDSWITH 以什么字符串结尾

    NSPredicate *predicate7 = [NSPredicate predicateWithFormat:@"name ENDSWITH 'e'"];

    NSArray *arr7 = [stuArray filteredArrayUsingPredicate:predicate7];

    NSLog(@"arr7 = %@",arr7);

    // CONTAINS 包含某个字符串

    NSPredicate *predicate8 = [NSPredicate predicateWithFormat:@"name CONTAINS 'a'"];

    NSArray *arr8 = [stuArray filteredArrayUsingPredicate:predicate8];

    NSLog(@"arr8 = %@",arr8);

    /*

     LIKE：

     1、 LIKE '*a*' 包含某个字符串

     2、 LIKE 'j*' 以某个字符串开头

     3、 LIKE '*e 以某个字符串结尾

     4、 LIKE '?a*' 第二个字符串是 a 的

     5、 LIKE[c] 'r*' [c] 表示忽略大小写

     *: 星号表示任意个字符位，？问号，表示一个字符位，[c] 表示忽略大小写

     */

    NSPredicate *predicate9 = [NSPredicate predicateWithFormat:@"name LIKE '*a*'"];

    NSArray *arr9 = [stuArray filteredArrayUsingPredicate:predicate9];

    NSLog(@"arr9 = %@",arr9);

    NSPredicate *predicate10 = [NSPredicate predicateWithFormat:@"name LIKE[c] 'r*'"];

    NSArray *arr10 = [stuArray filteredArrayUsingPredicate:predicate10];

    NSLog(@"arr10 = %@",arr10);

    NSPredicate *predicate11 = [NSPredicate predicateWithFormat:@"name LIKE '*e'"];

    NSArray *arr11 = [stuArray filteredArrayUsingPredicate:predicate11];

    NSLog(@"arr11 = %@",arr11);

    NSPredicate *predicate12 = [NSPredicate predicateWithFormat:@"name LIKE '?a*'"];

    NSArray *arr12 = [stuArray filteredArrayUsingPredicate:predicate12];

    NSLog(@"arr12 = %@",arr12);

    // NSMutableArray 使用 filterUsingPredicate，不会返回一个新数组，而是直接覆盖原来的可变数组

    NSPredicate *predicate13 = [NSPredicate predicateWithFormat:@"name LIKE '?a*'"];

    [stuArray filterUsingPredicate:predicate13];

    NSLog(@"stuArray = %@",stuArray);

本文GitHub地址https://github.com/zhangkiwi/iOS_SN_NSPredicate