获取数组中最大的那个值

1:获取数组中最大的那个值 

NSMutableArray * infoarray = [[NSMutableArray alloc] init];

for (GCBabyInformationModel * infomodel in self.babydata) {

        CGFloat namewith = [responseBuilder WidthLableTitle:infomodel.name textFont:FontArial(16) Emptylen:0 linespacing:0 Labelheight:30];

      [infoarray addObject:[NSNumber numberWithFloat:namewith]];

    }

 CGFloat max_infowith = [[infoarray valueForKeyPath:@"@max.floatValue"] floatValue]; //获取数组中最大的那个值