nsarray排序

//

//  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;

}