NSArray的一个方法 - 黑马程序员技术交流社区

void arraySort() {
Student *stu1 = [[Student alloc] initWithName:@"lisi" andAge:18 andScore:87];
Student *stu2 = [[Student alloc] initWithName:@"wangwu" andAge:19 andScore:60];
Student *stu3 = [[Student alloc] initWithName:@"zhangsan" andAge:28 andScore:89.5];
Student *stu4 = [[Student alloc] initWithName:@"zhaoliu" andAge:38 andScore:99];
Student *stu5 = [[Student alloc] initWithName:@"liMing" andAge:17 andScore:79];
NSArray *array = [NSArray arrayWithObjects:stu1,stu2,stu3, stu4,stu5, nil];
NSLog(@"未排序前--------------------------------------\n");
[array enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSLog(@"%@",obj);
}];
// 1.先按照成绩进行排序
// 这里的key写的是get的名称
NSSortDescriptor *scoreDesc = [NSSortDescriptor sortDescriptorWithKey:@"score" ascending:YES];
// 2.再按照年龄进行排序
NSSortDescriptor *ageDesc = [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:YES];
// 3.再按照姓名进行排序
NSSortDescriptor *nameDesc = [NSSortDescriptor sortDescriptorWithKey:@"name" ascending:YES];
// 按顺序添加排序描述器
NSArray *descs = [NSArray arrayWithObjects:scoreDesc, ageDesc, nameDesc, nil];
NSArray *array2 = [array sortedArrayUsingDescriptors:descs];// 按升序排列
NSLog(@"排序后--------------------------------------");
[array2 enumerateObjectsUsingBlock:^(id obj, NSUInteger idx, BOOL *stop) {
NSLog(@"%@",obj);
}];
}

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