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iOS 对NSMutableArray进行排序和过滤的实例

2019年07月24日  | 移动技术网IT编程  | 我要评论

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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

以上这篇ios 对nsmutablearray进行排序和过滤的实例就是小编分享给大家的全部内容了，希望能给大家一个参考，也希望大家多多支持移动技术网。

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