NSArray *array = @[@"tailong", @"kaersasi", @"airuiliya", @"yingliuzhizhu"];
NSMutableArray *mArray = [NSMutableArray arrayWithObjects:@"genie", @"weizhuang", @"tianming", @"shaoyu", @"gaoyue", nil];
/**
* 1.使用NSSortDescriptor（排序描述符，相当于排序条件）
排序描述符由两个参数组成
key：对于一个给定的集合，对应值的键位对集合中的每个元素进行排序
accending：升序（YES）或降序（NO）
*/
// 给排序的数组生成排序描述符
NSSortDescriptor *arraySortDes = [[NSSortDescriptor alloc] initWithKey:@"self" ascending:YES];
// 不可变数组排序
NSArray *array1 = [array sortedArrayUsingDescriptors:@[arraySortDes]];
//NSLog(@"%@", array1);
for (NSString *obj in array1) {
NSLog(@"%@", obj);
}
// 可变数组排序
[mArray sortUsingDescriptors:@[arraySortDes]];
for (NSString *str in mArray) {
NSLog(@"%@", str);
}
//新建一个Person类
Person.h
#import <Foundation/Foundation.h> @interface Person : NSObject @property (nonatomic, retain) NSString *name;
@property (nonatomic, retain) NSString *gender;
@property (nonatomic, assign) NSInteger age; // 自定义初始化方法
- (instancetype)initWithName:(NSString *)name
andGender:(NSString *)gender
andAge:(NSInteger)age; // 遍历构造器
+ (instancetype)personWithName:(NSString *)name
andGender:(NSString *)gender
andAge:(NSInteger)age; // 比较两个人的姓名
- (NSComparisonResult)compareByName:(Person *)person; // 比较两个人的年龄
- (NSComparisonResult)compareByAge:(Person *)person; @end
Person.m
#import "Person.h" @implementation Person // 自定义初始化方法
- (instancetype)initWithName:(NSString *)name
andGender:(NSString *)gender
andAge:(NSInteger)age {
if (self = [super init]) {
self.name = name;
self.gender = gender;
self.age = age;
}
return self;
} // 遍历构造器
+ (instancetype)personWithName:(NSString *)name
andGender:(NSString *)gender
andAge:(NSInteger)age {
Person *p = [[Person alloc] initWithName:name andGender:gender andAge:age];
return p;
} // 重写description
- (NSString *)description {
return [NSString stringWithFormat:@"name = %@, gender = %@, age = %ld", self.name, _gender, _age];
} // 比较两个人的姓名(降序在[]前面加个-)
- (NSComparisonResult)compareByName:(Person *)person {
return [self.name compare:person.name];
} // 比较两个人的年龄(降序把>改为<)
- (NSComparisonResult)compareByAge:(Person *)person {
return self.age > person.age;
} @end
// 数组中存放自定义对象进行排序
Person *p1 = [Person personWithName:@"tailong" andGender:@"男" andAge:27];
Person *p2 = [Person personWithName:@"manwang" andGender:@"男" andAge:24];
Person *p3 = [Person personWithName:@"hanbing" andGender:@"女" andAge:20];
Person *p4 = [Person personWithName:@"airuiliya" andGender:@"女" andAge:21];
Person *p5 = [Person personWithName:@"jiansheng" andGender:@"男" andAge:23];
//不可变数组
NSArray *personArray = @[p1, p2, p3, p4, p5];
// 按照姓名进行排序
// 创建排序描述对象
NSSortDescriptor *sortDes1 = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:YES];
NSArray *personArray1 = [personArray sortedArrayUsingDescriptors:@[sortDes1]];
NSLog(@"%@", personArray1);
// 按照年龄进行排序
NSSortDescriptor *sortDes2 = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:NO];
NSArray *personArray2 = [personArray sortedArrayUsingDescriptors:@[sortDes2]];
NSLog(@"%@", personArray2);
// 可变数组
NSMutableArray *mPersonArray = [@[p1, p2, p3, p4, p5] mutableCopy];
// 按照年龄进行排序
NSSortDescriptor *mSortDes1 = [[NSSortDescriptor alloc] initWithKey:@"age" ascending:YES];
[mPersonArray sortUsingDescriptors:@[mSortDes1]];
NSLog(@"%@", mPersonArray);
// 按照姓名进行排序
NSSortDescriptor *mSortDes2 = [[NSSortDescriptor alloc] initWithKey:@"name" ascending:NO];
[mPersonArray sortUsingDescriptors:@[mSortDes2]];
NSLog(@"%@", mPersonArray);
/**
* 2.使用数组中两个元素比较的方法名排序
*/
// 不可变数组
SEL sel = @selector(compare:);
array = [array sortedArrayUsingSelector:sel];
NSLog(@"%@", array);
// 可变数组
[mArray sortUsingSelector:@selector(compare:)];
NSLog(@"%@", mArray);
// 数组中存放自定义对象进行排序
// 不可变数组排序
// 按照姓名排序
personArray = [personArray sortedArrayUsingSelector:@selector(compareByName:)];
NSLog(@"%@", personArray);
// 按照年龄进行排序
personArray = [personArray sortedArrayUsingSelector:@selector(compareByAge:)];
NSLog(@"%@", personArray);
// 可变数组
// 按照姓名排序
[mPersonArray sortUsingSelector:@selector(compareByName:)];
NSLog(@"%@", mPersonArray);
// 按照年龄进行排序
[mPersonArray sortUsingSelector:@selector(compareByAge:)];
NSLog(@"%@", mPersonArray);