常用工具方法

1.计算包裹文字cell的尺寸

• (void)getCellWidthWithDataArray:(NSMutableArray *)dataArray{

  self.widthArr = [[NSMutableArray alloc]init];
  for (int i = 0; i < dataArray.count; i ++) {
  NSDictionary *dataDic = self.dataArray[i];
  NSString *str = dataDic[@"name"];
  CGSize titleSize = [str sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize:10]}];
  CGSize size = CGSizeMake(30 + titleSize.width * baseProWidth, 15 + titleSize.height * baseProHeight);
  NSNumber *number = [NSNumber numberWithFloat:size.width];

    [self.widthArr addObject:number];
  

  }
  }

2.从数据源中取数据,比较得到一个数组中最值,然后返回(discountArray数组有三个值,分别为最大\最小\相同):

    for (int i = 0; i < weakSelf.preCardList.count; i++) {
          NSNumber *rate = weakSelf.preCardList[i][@"discount_rate"];
          [discountRate addObject:rate];
         }
   NSArray *discountArray = [discountRate sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
   if ([obj1 floatValue] > [obj2 floatValue] ) {
          return NSOrderedDescending;
        }
   if ([obj1 floatValue] < [obj2 floatValue] ) {
         return NSOrderedAscending;
       }
                    
      return NSOrderedSame;
      }];

3.设置导航栏样式:

   [[UIApplication sharedApplication] setStatusBarStyle:UIStatusBarStyleDefault];