时间：2021-05-15 09:08:30 | 栏目：iOS代码 | 点击：次
根据实体类的属性进行排序，这个属性排序还可以增加几个排序规则，前后的规则先判断，如果一样的则根据第二个排序规则来判断
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"data" ascending:YES];//其中，price为数组中的对象的属性，这个针对数组中存放对象比较更简洁方便 NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:&sortDescriptor count:1]; [self.dataArray sortUsingDescriptors:sortDescriptors];
过滤不会对原来的数据产生影响，而是生成符合过滤条件的NSArray数据
NSPredicate *apredicate=[NSPredicate predicateWithFormat:@"id>=%ld AND id<=%ld",3,5]; NSArray *newArr=[self.dataArray filteredArrayUsingPredicate:apredicate];
下面是个例子可以运行看看
#import <Foundation/Foundation.h> @interface TestBean : NSObject @property(nonatomic,assign)int id; @property(nonatomic,strong)NSString* data; @end
#import <UIKit/UIKit.h>
@interface ViewController : UIViewController<UITableViewDelegate,UITableViewDataSource>
@property (strong, nonatomic) NSArray
*list;
@end
//
// ViewController.m
// First
//
// Created by shanreal-iOS on 17/10/16.
// Copyright © 2017年 shanreal.LongZhenHao. All rights reserved.
//
#import "ViewController.h"
#import "TestBean.h"
@interface ViewController ()
@property(nonatomic,strong)NSMutableArray* dataArray;
@end
@implementation ViewController
- (void)viewDidLoad {
[super viewDidLoad];
// Do any additional setup after loading the view.
_dataArray = [NSMutableArray array];
TestBean* one = [[TestBean alloc]init];
one.id = 1;
one.data = @"one";
[_dataArray addObject:one];
one = [[TestBean alloc]init];
one.id = 2;
one.data = @"two";
[_dataArray addObject:one];
one = [[TestBean alloc]init];
one.id = 22;
one.data = @"two2";
[_dataArray addObject:one];
one = [[TestBean alloc]init];
one.id = 3;
one.data = @"three";
[_dataArray addObject:one];
one = [[TestBean alloc]init];
one.id = 4;
one.data = @"four";
[_dataArray addObject:one];
one = [[TestBean alloc]init];
one.id = 44;
one.data = @"four4";
[_dataArray addObject:one];
one = [[TestBean alloc]init];
one.id = 5;
one.data = @"five";
[_dataArray addObject:one];
one = [[TestBean alloc]init];
one.id = 6;
one.data = @"six";
[_dataArray addObject:one];
[self oneClick];
[self twoClick];
}
-(void)oneClick{
NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"data" ascending:YES];//其中，price为数组中的对象的属性，这个针对数组中存放对象比较更简洁方便
NSArray *sortDescriptors = [[NSArray alloc] initWithObjects:&sortDescriptor count:1];
[self.dataArray sortUsingDescriptors:sortDescriptors];
[self logArray:self.dataArray];
}
-(void)twoClick{
NSPredicate *apredicate=[NSPredicate predicateWithFormat:@"id>=%ld AND id<=%ld",3,5];
NSArray *newArr=[self.dataArray filteredArrayUsingPredicate:apredicate];
[self logArray:newArr];
}
-(void)logArray:(NSArray*)array{
NSLog(@"---------------------------------");
for(TestBean* bean in array){
NSLog(@"%d %@",bean.id,bean.data);
}
}
@end