iOS给自定义个model排序

今天有朋友问我怎么给Model排序,我顺便写了一个,伸手党直接复制吧.
例如,我建了一个Person类,要按Person的年龄属性排序:
Person *per = [[Person alloc] init];
per.name = @"z";
per.age = 89;

Person *per1 = [[Person alloc] init];
per1.name = @"h";
per1.age = 18;

Person *per2 = [[Person alloc] init];
per2.name = @"l";
per2.age = 44;


NSMutableArray *array = [NSMutableArray array];
[array addObject:per];
[array addObject:per1];
[array addObject:per2];

NSArray *resultArray = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {

    Person *per1 = obj1;
    Person *per2 = obj2;
    
    if (per1.age > per2.age) {
        
        return NSOrderedDescending;//降序
    }else if (per1.age < per2.age)
    {
        return NSOrderedAscending;//升序
    }else
    {
        return NSOrderedSame;//相等
    }
    
}];


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