通过OC实现简单的冒泡排序

 NSMutableArray *arr = [@[@"",@"",@"",@"",@"",@"",@"",@""] mutableCopy];

     for (int i=; i<[arr count]-; i++) {
         for (int j=; j<[arr count]--i; j++) {
             NSString *s1 = arr[j];
             NSString *s2 = arr[j+];

             NSInteger i1 = [s1 integerValue];
             NSInteger i2 = [s2 integerValue];
             if (i1 > i2) {
                 [arr replaceObjectAtIndex:j withObject:s2];
                 [arr replaceObjectAtIndex:j+ withObject:s1];
             }
         }
     }
     NSLog(@"排序后的结果：%@", [arr componentsJoinedByString:@","]);