1 NSArray *array = @[@(3),@(4),@(1),@(2),@(5)];
2 //升序
3 NSArray *array1 = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
4 return [obj1 compare:obj2];
5 }];
6 NSLog(@"%@",array1);
7
8 //降序
9 NSArray *array2 = [array sortedArrayUsingComparator:^NSComparisonResult(NSNumber *obj1,NSNumber *obj2) {
10 //相对于升序,compare参数调换一下
11 return [obj2 compare:obj1];
12 }];
13 NSLog(@"%@",array2);
14
15
16 //乱序
17 NSArray *array3 = [array sortedArrayUsingComparator:^NSComparisonResult(NSNumber *obj1,NSNumber *obj2) {
18 //0或者1的随机数
19 int i = arc4random_uniform(2);
20 if (i) {
21 return [obj1 compare:obj2];
22 }else{
23 return [obj2 compare:obj1];
24 }
25
26 }];
27 NSLog(@"%@",array3);
