ios nsmutablearray copy（ios nsarray nsset）

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

1 2 3 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

1 2 3 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

1 2 3 4 5 6 #import <Foundation/Foundation.h> @interface TestBean : NSObject @property(nonatomic,assign)int id; @property(nonatomic,strong)NSString* data; @end

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 #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