IOS NSPredicate 查询、搜索

最新推荐文章于 2021-11-20 09:52:04 发布

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最新推荐文章于 2021-11-20 09:52:04 发布

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本文介绍了如何利用NSPredicate在iOS开发中实现高效的数据过滤功能。通过具体的代码示例展示了针对字符串数组及自定义模型对象的搜索过程，包括基本的字符串匹配及复杂条件的组合查询。

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@interface TFCityAddressModel : NSObject

@property (nonatomic, copy) NSString *cityName;

@property (nonatomic, copy) NSString *cityPinYin;

@property (nonatomic, copy) NSString *cityPinYinHead;

@end

@implementation TFCityAddressModel

@end

//单个字符串的查询语句
// [NSPredicate predicateWithFormat:@"SELF CONTAINS[cd] %@",searchBarText];
- (void)testNSPredicate
{
    NSString *searchBarText = @"北京";
    NSArray *_cityAddressArray = @[@"杭州",@"台北",@"北京"];
    NSPredicate *_tfPredicate = [NSPredicate predicateWithFormat:@"SELF CONTAINS[cd] %@",searchBarText];
    NSArray *array = [_cityAddressArray filteredArrayUsingPredicate:_tfPredicate];

    for (NSString *cityName in array)
    {
        CHDebugLog(@"testNSPredicate----%@",cityName);
    }
}
结果如下：
CommonDemo[4098:101861] testModelNSPredicate——北京

//model查询语句
- (void)testModelNSPredicate
{
    //NSString *searchBarText = @"北京";
    NSString *searchBarText = @"t";
    NSMutableArray *_cityAddressArray = [[NSMutableArray alloc]init];
    
    TFCityAddressModel *_info = [[TFCityAddressModel alloc]init];
    _info.cityName = @"北京";
    _info.cityPinYin = @"beijing";
    _info.cityPinYinHead = @"b";
    [_cityAddressArray addObject:_info];
    
    TFCityAddressModel *_info1 = [[TFCityAddressModel alloc]init];
    _info1.cityName = @"台北";
    _info1.cityPinYin = @"taibei";
    _info1.cityPinYinHead = @"t";
    [_cityAddressArray addObject:_info1];
    
    TFCityAddressModel *_info2 = [[TFCityAddressModel alloc]init];
    _info2.cityName = @"杭州";
    _info2.cityPinYin = @"hangzhou";
    _info2.cityPinYinHead = @"h";
    [_cityAddressArray addObject:_info2];
    

    NSPredicate *_tfPredicate = [NSPredicate predicateWithFormat:@"(cityName CONTAINS[cd] %@) OR (cityPinYin CONTAINS[cd] %@) OR (cityPinYinHead CONTAINS[cd] %@)", searchBarText, searchBarText, searchBarText];
    NSArray *array = [_cityAddressArray filteredArrayUsingPredicate:_tfPredicate];
    
    for (TFCityAddressModel *_modelInfo in array)
    {
        CHDebugLog(@"testNSPredicate----%@",_modelInfo.cityName);
    }
}
结果如下：
CommonDemo[4098:101861] testModelNSPredicate——北京
CommonDemo[4098:101861] testModelNSPredicate----台北

- (void)testNSPredicateExpression
{
    NSString *regex = @"[A-Za-z]";
    
    //判断a是否属于正则表达式[A-Za-z]，若是则正确，否则错误。
    BOOL a = [self isValidateRegularExpression:@"a" byExpression:regex];
    
    if (a)
    {
        CHDebugLog(@"------test testNSPredicateExpression");
    }
}

//是否是有效的正则表达式
- (BOOL)isValidateRegularExpression:(NSString *)strDestination byExpression:(NSString *)strExpression
{
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF MATCHES %@", strExpression];
    
    return [predicate evaluateWithObject:strDestination];
}