OC-排序-自定义类型对象的排序

.main.m 代码

 /**********    自定义类型对象的排序  *****************/

Person *per1 = [[Person alloc] initWithName:@"Long" age:22];
Person *per2 = [[Person alloc] initWithName:@"Bian" age:18];
Person *per3 = [[Person alloc] initWithName:@"YI" age:20];
NSMutableArray *perArr = [NSMutableArray arrayWithObjects:per1, per2, per3, nil];

[perArr sortUsingSelector:@selector(compareWithName:)];
//[perArr sortedArrayUsingSelector:@selector(compareWithAge:)];

for (Person *per in perArr) {
    NSLog(@"%@ %ld", per.name, per.age);
}

Person.h 代码

@property (nonatomic, copy) NSString *name;

@property (nonatomic, assign) NSInteger age;

• (instancetype)initWithName:(NSString *)name

                       age:(NSInteger)age;
  

• (NSComparisonResult)compareWithName:(Person *)per;
• (NSComparisonResult)compareWithAge:(Person *)per;

Person.m 代码

- (instancetype)initWithName:(NSString *)name
                     age:(NSInteger)age

{

self = [super init];
if (self) {
    self.name = name;
    self.age = age;
}
return self;

}

• (NSComparisonResult)compareWithName:(Person *)per

{
return [self.name compare:per.name] ;
}

• (NSComparisonResult)compareWithAge:(Person *)per
  {
  if (self.age > per.age) {

  return NSOrderedDescending;

  } else if (self.age < per.age) {

  return NSOrderedAscending;

  } else {

  return NSOrderedSame;

  }
  }