[Object C]_[初级]_[NSArray排序]_objectc nsarray 排序-优快云博客

本文介绍四种NSArray排序方法：使用sortedArrayUsingComparator与自定义比较器；使用sortedArrayUsingSelector与系统预定义选择器；使用sortedArrayUsingFunction与自定义排序函数；使用sortUsingDescriptors与NSSortDescriptor。

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场景：根据需求让数据内的元素有序排列。

下面是具体实例说明。

ArrayObject.h

#import <Foundation/Foundation.h>

@interface Person : NSObject
{
    NSString  *_name;
    
    NSInteger  _age;
}
@property (readwrite, copy) NSString  *_name;
@property (readwrite, assign) NSInteger  _age;
@end

@interface ArrayObject : NSObject

-(void)testSortedArrayUsingComparater;
-(void) testSortArrayUsingSelector;
-(void) testSortedArrayUsingFunction;
-(void) doTestSortUsingDescriptors;

@end

ArrayObject.m

#import "ArrayObject.h"
@implementation Person
@synthesize _name;
@synthesize  _age;


- (void)dealloc
{
    [_name release];
    
    [super dealloc];
}

@end

@implementation ArrayObject


//第一种，利用数组的sortedArrayUsingComparator调用 NSComparator ，obj1和obj2指的数组中的对象
NSComparator cmptr = ^(id obj1, id obj2){
    if ([obj1 integerValue] > [obj2 integerValue]) {
        return (NSComparisonResult)NSOrderedDescending;
    }
    
    if ([obj1 integerValue] < [obj2 integerValue]) {
        return (NSComparisonResult)NSOrderedAscending;
    }
    return (NSComparisonResult)NSOrderedSame;
};

-(void)testSortedArrayUsingComparater
{
    NSArray *sortArray = [[NSArray alloc] initWithObjects:@"10",@"13",@"5",@"15",@"8",@"20",@"1",@"5",@"3",@"7",@"45",@"4",@"23",@"",nil];
    //排序前
    NSMutableString *beforeStr = [NSMutableString new];
    for(NSString *str in sortArray)
    {
        [beforeStr appendFormat:@"%@ ",str];
    }
     NSLog(@"排序前:%@",beforeStr);
     [beforeStr release];
     //第一种排序
     NSArray *array = [sortArray sortedArrayUsingComparator:cmptr];
     
     NSMutableString *afterStr = [NSMutableString new];
     for(NSString *str in array){
         [afterStr appendFormat:@"%@ ",str];
      }
      NSLog(@"排序后:%@",afterStr);
      [afterStr release];

}

输出结果：

//第二种排序算法利用sortedArrayUsingSelector调用系统定义的compare:,主要是对字符串的比较

-(void) testSortArrayUsingSelector
{
    NSArray *sortArray = [[NSArray alloc] initWithObjects:@"10",@"13",@"5",@"15",@"8",@"20",@"1",@"5",@"3",@"7",@"45",@"4",@"23",@"",nil];
    //排序前
     NSMutableString *beforeStr = [NSMutableString new];
    for(NSString *str in sortArray)
    {
        [beforeStr appendFormat:@"%@ ",str];
    }
    NSLog(@"排序前:%@",beforeStr);
    [beforeStr release];
    //第一种排序
    //- (NSComparisonResult)compare:(NSString *)string;//比较字符串的大小
    //- (NSComparisonResult)compare:(NSString *)string options:(NSStringCompareOptions)mask; 比较字符串,按mask的参数进行比较
   //mask 参数可以是: NSCaseInsensitiveSearch, NSLiteralSearch, NSNumericSearch.
    
    NSArray *array =[sortArray sortedArrayUsingSelector:@selector(compare:options:)];
    
     NSMutableString *affterStr = [NSMutableString new];
    for(NSString *str in array){
        [affterStr appendFormat:@"%@ ",str];
    }
    NSLog(@"排序后:%@",affterStr);
    [affterStr release];

}

输出结果：

若把

NSArray *array =[sortArray sortedArrayUsingSelector:@selector(compare:options:)];中<pre name="code" class="objc">compare:options:改为compare:，则输出结果为：

//第三种排序方法利用sortedArrayUsingFunction 调用对应方法customSort，这个方法中的obj1和obj2分别是指数组中的对象。

NSInteger customSort(id obj1, id obj2,void* context){
    if ([obj1 integerValue] > [obj2 integerValue]) {
        return (NSComparisonResult)NSOrderedDescending;
    }
    
    if ([obj1 integerValue] < [obj2 integerValue]) {
        return (NSComparisonResult)NSOrderedAscending;
    }
    return (NSComparisonResult)NSOrderedSame;
}
-(void) testSortedArrayUsingFunction
{
    NSArray *sortArray = [[NSArray alloc] initWithObjects:@"10",@"13",@"5",@"15",@"8",@"20",@"1",@"5",@"3",@"7",@"45",@"4",@"23",@"",nil];
    //排序前
    NSMutableString *beforeStr = [NSMutableString new];
    for(NSString *str in sortArray){
    [beforeStr appendFormat:@"%@ ",str];
     }
     NSLog(@"排序前:%@",beforeStr);
     [beforeStr release];
     
     NSArray *array = [sortArray sortedArrayUsingFunction:customSort context:nil];
     
     NSMutableString *afterStr = [NSMutableString new];
     for(NSString *str in array){
         [afterStr appendFormat:@"%@ ",str];
          }
      NSLog(@"排序后:%@",afterStr);
      [afterStr release];

}

输出结果：

//第四种利用sortUsingDescriptors调用NSSortDescriptor

-(void) doTestSortUsingDescriptors
{
    Person *person1 = [[Person alloc] init];
    [person1 set_name:@"ABCD"];
    [person1 set_age:24];
    
    Person *person2 = [[Person alloc] init];
    [person2 set_name:@"ACBA"];
    [person2 set_age:22];
    
    Person *person3 = [[Person alloc] init];
    [person3 set_name:@"ABDC"];
    [person3 set_age:33];
    
    NSMutableArray *array = [NSMutableArray arrayWithObjects:person1, person2, person3, nil];
    [person1 release];
    [person2 release];
    [person3 release];
    NSSortDescriptor *sortDescriptor = [NSSortDescriptor sortDescriptorWithKey:@"_name" ascending:YES];//YES降序，NO升序
    //这个数组保存的是排序好的对象
    NSArray *tempArray = [array sortedArrayUsingDescriptors:[NSArray arrayWithObject:sortDescriptor]];
    for (Person *ii in tempArray) {
         NSLog(@"name:%@,age:%ld",ii._name,ii._age);
    }

}

@end

输出结果：

降序：ascending:YES