//
// main.m
// 05-数组排序
//
// Created by apple on 14-3-21.
// Copyright (c) 2014年 apple. All rights reserved.
//
#import <Foundation/Foundation.h>
#import "Person.h"
int main(int argc, const char * argv[])
{
@autoreleasepool {
//1.使用sortedArrayUsingSelector
//也是最简单的排序方式
//数组是按照你存入元素的顺序存储的
NSArray * array = @[@"b",@"d",@"a",@"z"];
NSLog(@"排序前 array %@",array);
array = [array sortedArrayUsingSelector:@selector(compare:)];
// NSArray * array1 = [array sortedArrayUsingSelector:@selector(compare:)];
NSLog(@"排序后 array %@",array);
//2.使用block方式排序
NSArray * array2 = @[@"z",@"4",@"b",@"3",@"x"];
NSLog(@"array2 排序前 %@",array2);
array2 = [array2 sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
/*
NSComparisonResult retuslt = [obj1 compare:obj2];
return retuslt;
*/
//obj1 compare obj2 就是正序排序
// return [obj1 compare:obj2];
//obj2 compare obj1 就是倒序排序
return [obj2 compare:obj1];
}];
NSLog(@"array2 排序后 %@",array2);
Person * p1 = [[Person alloc] initWithName:@"xiaozhe" andAge:20 andYear:@"1990"];
Person * p2 = [[Person alloc] initWithName:@"alex" andAge:18 andYear:@"2990"];
Person * p3 = [[Person alloc] initWithName:@"merry" andAge:25 andYear:@"1890"];
NSArray * array3 = @[p1,p2,p3];
NSLog(@"array3 排序前 %@",array3);
//3.使用 给数组排序
//如果你向给你自己定义的对象排序,必须根据某一个属性来排序,
//sortDescriptorWithKey 参数要的就是你对象中,要依据哪个属性来排序,你就把哪个属性的名字当成key传入
//ascending YES表示正序 NO表示倒叙
NSSortDescriptor * d1 = [NSSortDescriptor sortDescriptorWithKey:@"age" ascending:NO];
NSSortDescriptor * d2 = [NSSortDescriptor sortDescriptorWithKey:@"year" ascending:NO];
//如果你要使用多个属性进行排序,默认在前面的NSSortDescriptor优先级比较高
NSArray * descripts = @[d2,d1];
array3 = [array3 sortedArrayUsingDescriptors:descripts];
NSLog(@"array 3 排序后 %@",array3);
//4.
NSArray * array4 = @[p1,p2,p3];
NSLog(@"array4 排序前 %@",array4);
array4 = [array4 sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
Person * p1 = obj1;
Person * p2 = obj2;
//year
return [p1.year compare:p2.year];
}];
NSLog(@"array4 排序后 %@",array4);
}
return 0;
}