Question

我有一个带有NSString，UIImage和BOOL属性的personObject。我想创建一个只过滤NSString

的谓词

personObject *person1 = [[personObject alloc]initWithName:@"John Smith" Photo:nil Invited:false];
personObject *person2 = [[personObject alloc]initWithName:@"Peter Smith" Photo:nil Invited:false];
personObject *person3 = [[personObject alloc]initWithName:@"Paul Smith" Photo:nil Invited:false];

[self.peopleArray addObject:person1];
[self.peopleArray addObject:person2];
[self.peopleArray addObject:person3];

- (void) filterContententForSearchText: (NSString *) searchText scope:(NSString *) scope{
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF beginswith[c] %@", searchText];
self.searchArray = [self.peopleArray filteredArrayUsingPredicate:predicate];

}

People数组包含personObjects。

Answer 1

您可以使用

+ (NSPredicate *)predicateWithBlock:(BOOL (^)(id evaluatedObject, NSDictionary *bindings))block

Answer 2

您应检查name属性，如果要将其作为子字符串进行搜索，请使用contains，请参阅此示例：

Class PersonObject：

@interface PersonObject : NSObject
{
    NSString* name;
    UIImage* img;
    BOOL invited;
}
-(id)initWithName:(NSString*)name Photo:(UIImage*)img Invited:(BOOL)invited;

@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) UIImage *img;
@property (nonatomic, assign, getter=isInvited) BOOL invited;
@end

实现：

#import "PersonObject.h"

@implementation PersonObject

-(id)initWithName:(NSString*)n Photo:(UIImage*)im Invited:(BOOL)i{
    if(self = [super init]){
        _name=n;
        _img=im;
        _invited=i;
    }
    return self;
    }

@end

代码：

PersonObject *person1 = [[PersonObject alloc]initWithName:@"John Smith" Photo:nil Invited:false];
PersonObject *person2 = [[PersonObject alloc]initWithName:@"Peter Smith" Photo:nil Invited:false];
PersonObject *person3 = [[PersonObject alloc]initWithName:@"Paul Smith" Photo:nil Invited:false];

[self.peopleArray addObject:person1];
[self.peopleArray addObject:person2];
[self.peopleArray addObject:person3];


NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF.name contains[c] %@", @"Smith"];
self.searchArray = [self.peopleArray filteredArrayUsingPredicate:predicate];
NSLog(@"results: %@", self.searchArray);

输出：

2014-09-22 14:57:31.010 asf[27731:2455623] results: (
"<personObject: 0x7ffdbe301050>",
"<personObject: 0x7ffdbe3010c0>",
"<personObject: 0x7ffdbe3010f0>"
)

希望它有所帮助！

过滤数组中的某些对象

2 个答案: