iOS对NSMutableArray进行排序和过滤的实例
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
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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@interface TestBean : NSObject @property(nonatomic,assign)int id; @property(nonatomic,strong)NSString* data; @end
#import@interface ViewController : UIViewController @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
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本文名称:iOS对NSMutableArray进行排序和过滤的实例
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